Bump version to v5.9.11

mapOrphanBlocksByPrev.insert dereferenced pblock2 after std::move'ing it into mapOrphanBlocks - guaranteed null deref (segfault at offset 4) on every orphan block received. Capture hashPrevBlock and the raw pointer before the move.

Also add -ignoredupstake (default off): bypasses the duplicate proof-of-stake rejection so canonical blocks can be imported when a fork twin staking the same outpoint was seen first. Recovery/diagnostic use only.

.gitea/krystie-release.pub.asc

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.gitea/krystie_gate.py

@@ -0,0 +1,262 @@
+#!/usr/bin/env python3
+"""Krystie Gate — static check stage of the CI gate.
+
+Runs inside the Gitea Actions runner. Inspects all commits that were just
+pushed to a krystie-wip/* branch and rejects if any violates the gate rules.
+
+Decision per commit:
+  * If signed by Krystie's GPG key (fingerprint DCF2579968107984), apply the
+    full per-repo gate.
+  * If signed by a different key OR unsigned, allow (Sami's authority).
+
+Per-repo enforcement:
+  * triangles_v5      : red-list (consensus paths) + test-first + no-clearnet
+  * triangles-explorer, triangles-api, tridock-web-wallet, sami-chat, tri-pi:
+                        test-first only
+  * homebrew-triangles: formula syntax check only
+
+Outputs:
+  * On reject, prints REJECTED lines to stderr and exits 1.
+  * On accept, sets `is_krystie_commit` GH-actions output to true/false.
+"""
+from __future__ import annotations
+
+import os
+import re
+import subprocess
+import sys
+from dataclasses import dataclass
+from pathlib import Path
+
+# Krystie's GPG identity. We accept both the primary long-ID and the
+# signing subkey because `git log %GK` returns the subkey that was actually
+# used to sign, not the primary. The full primary fingerprint is also
+# included so a paranoid future check can validate the chain.
+KRYSTIE_PRIMARY_FP = "523A81833EB7201573E1EFE1DCF2579968107984"
+KRYSTIE_KEY_IDS = {
+    "DCF2579968107984",  # primary long-ID
+    "C2DC60618C85A159",  # signing subkey long-ID
+}
+
+RED_LIST_TRIANGLES_V5 = [
+    re.compile(r"^src/main\.(cpp|h)$"),
+    re.compile(r"^src/validation.*"),
+    re.compile(r"^src/kernel\.(cpp|h)$"),
+    re.compile(r"^src/checkpoints\.(cpp|h)$"),
+    re.compile(r"^src/consensus/"),
+    re.compile(r"^src/protocol\.(cpp|h)$"),
+    re.compile(r"^src/net\.(cpp|h)$"),
+    re.compile(r"^src/netbase\.(cpp|h)$"),
+    re.compile(r"^src/net_bootstrap\.(cpp|h)$"),
+    re.compile(r"^src/chainparams.*"),
+    re.compile(r"^src/clientversion\.h$"),
+    re.compile(r"^src/key\.(cpp|h)$"),
+    re.compile(r"^src/keystore\.(cpp|h)$"),
+    re.compile(r"^src/onionseed\.h$"),
+    re.compile(r"^contrib/seeds/"),
+    re.compile(r"^contrib/devtools/release.*"),
+    re.compile(r"^doc/release-process\.txt$"),
+]
+
+TEST_DIRS = {
+    "triangles_v5":       ["src/test/", "test/"],
+    "triangles-explorer": ["src/__tests__/", "tests/", "test/"],
+    "triangles-api":      ["test/", "__tests__/", "tests/"],
+    "tridock-web-wallet": ["test/", "__tests__/", "tests/"],
+    "sami-chat":          ["test/", "__tests__/", "tests/"],
+    "tri-pi":             ["test/", "tests/"],
+    "homebrew-triangles": [],
+}
+
+SOURCE_EXTS = {
+    "triangles_v5":       {".cpp", ".h", ".c"},
+    "triangles-explorer": {".ts", ".tsx", ".js", ".svelte"},
+    "triangles-api":      {".js", ".ts"},
+    "tridock-web-wallet": {".ts", ".tsx", ".js", ".svelte", ".vue"},
+    "sami-chat":          {".ts", ".tsx", ".js", ".svelte", ".vue"},
+    "tri-pi":             {".py", ".sh", ".ts", ".js"},
+    "homebrew-triangles": set(),
+}
+
+RED_LIST_REPOS = {"triangles_v5"}
+
+PEER_CONFIG_PATHS = [
+    re.compile(r"^contrib/seeds/"),
+    re.compile(r"^src/chainparams.*"),
+    re.compile(r".*triangles\.conf(\.example)?$"),
+]
+
+
+@dataclass
+class GateResult:
+    ok: bool
+    reason: str = ""
+
+
+def repo_name() -> str:
+    repo = os.environ.get("GITHUB_REPOSITORY", "")
+    return repo.split("/", 1)[1] if "/" in repo else repo
+
+
+def commit_signer(sha: str) -> str | None:
+    try:
+        out = subprocess.run(
+            ["git", "log", "-1", "--format=%GK", sha],
+            check=True, capture_output=True, text=True,
+        ).stdout.strip()
+        return out or None
+    except subprocess.CalledProcessError:
+        return None
+
+
+def is_krystie_commit(sha: str) -> bool:
+    fp = commit_signer(sha)
+    if not fp:
+        return False
+    # Accept any key ID we know belongs to Krystie. `git log %GK` returns the
+    # signing subkey, so we have to whitelist both primary and subkey.
+    return any(fp == known or known.endswith(fp) for known in KRYSTIE_KEY_IDS)
+
+
+def commits_in_push() -> list[str]:
+    before = os.environ.get("GITHUB_BEFORE", "")
+    sha = os.environ.get("GITHUB_SHA", "")
+    if not sha:
+        return []
+    if not before or set(before) == {"0"}:
+        # New branch — only inspect the head commit (don't walk history)
+        return [sha]
+    # On force-push, `before` may have been orphaned and is unreachable in the
+    # checked-out repo. `git rev-list before..sha` then exits 128. Fall back
+    # to inspecting the new head only — that's the safest guarantee we can
+    # make about what just landed.
+    try:
+        out = subprocess.run(
+            ["git", "rev-list", f"{before}..{sha}"],
+            check=True, capture_output=True, text=True,
+        ).stdout
+        return [c for c in out.split() if c]
+    except subprocess.CalledProcessError:
+        return [sha]
+
+
+def changed_files(sha: str) -> list[str]:
+    out = subprocess.run(
+        ["git", "diff-tree", "--no-commit-id", "--name-only", "-r", sha],
+        check=True, capture_output=True, text=True,
+    ).stdout
+    return [f for f in out.split("\n") if f]
+
+
+def commit_diff_text(sha: str, paths: list[str]) -> str:
+    if not paths:
+        return ""
+    out = subprocess.run(
+        ["git", "show", "--no-color", sha, "--"] + paths,
+        check=True, capture_output=True, text=True,
+    ).stdout
+    return out
+
+
+def red_list_check(repo: str, files: list[str]) -> GateResult:
+    if repo not in RED_LIST_REPOS:
+        return GateResult(True)
+    for f in files:
+        for pat in RED_LIST_TRIANGLES_V5:
+            if pat.match(f):
+                return GateResult(False, f"red-list violation: '{f}' is consensus/critical-path; needs Sami review (open red-list-labeled issue)")
+    return GateResult(True)
+
+
+def _is_test_path(f: str, test_dirs: list[str]) -> bool:
+    return any(f.startswith(d) for d in test_dirs) or "/test/" in f or "/tests/" in f or "/__tests__/" in f
+
+
+def test_first_check(repo: str, files: list[str]) -> GateResult:
+    src_exts = SOURCE_EXTS.get(repo, set())
+    test_dirs = TEST_DIRS.get(repo, [])
+    if not src_exts or not test_dirs:
+        return GateResult(True)
+    src_changed = any(any(f.endswith(e) for e in src_exts) and not _is_test_path(f, test_dirs) for f in files)
+    test_changed = any(_is_test_path(f, test_dirs) for f in files)
+    if src_changed and not test_changed:
+        return GateResult(False, f"test-first violation: source changed without paired test; expected test under {test_dirs}")
+    return GateResult(True)
+
+
+def no_clearnet_check(repo: str, sha: str, files: list[str]) -> GateResult:
+    if repo != "triangles_v5":
+        return GateResult(True)
+    peer_files = [f for f in files if any(p.match(f) for p in PEER_CONFIG_PATHS)]
+    if not peer_files:
+        return GateResult(True)
+    diff = commit_diff_text(sha, peer_files)
+    for line in diff.split("\n"):
+        if not line.startswith("+") or line.startswith("+++"):
+            continue
+        body = line[1:].strip()
+        if re.search(r"\b(addnode|seednode|connect)\s*=", body, re.IGNORECASE):
+            if ".onion" not in body.lower():
+                return GateResult(False, f"no-clearnet: added peer/seed without .onion: {body[:120]}")
+        if re.match(r"^\s*(\d{1,3}\.){3}\d{1,3}\b", body) or re.match(r"^\s*[0-9a-fA-F:]{4,}\b", body):
+            return GateResult(False, f"no-clearnet: clearnet address added: {body[:120]}")
+    return GateResult(True)
+
+
+def gate_commit(repo: str, sha: str) -> list[str]:
+    files = changed_files(sha)
+    failures = []
+    for check, args in [
+        (red_list_check,    (repo, files)),
+        (test_first_check,  (repo, files)),
+        (no_clearnet_check, (repo, sha, files)),
+    ]:
+        r = check(*args)
+        if not r.ok:
+            failures.append(f"commit {sha[:12]}: {r.reason}")
+    return failures
+
+
+def emit_output(name: str, value: str):
+    out_file = os.environ.get("GITHUB_OUTPUT", "")
+    if out_file:
+        with open(out_file, "a") as fh:
+            fh.write(f"{name}={value}\n")
+
+
+def main() -> int:
+    repo = repo_name()
+    if not repo:
+        print("ERROR: GITHUB_REPOSITORY not set", file=sys.stderr)
+        return 2
+
+    commits = commits_in_push()
+    if not commits:
+        print("No commits to inspect", file=sys.stdout)
+        emit_output("is_krystie_commit", "false")
+        return 0
+
+    krystie_count = 0
+    all_failures: list[str] = []
+    for sha in commits:
+        if not is_krystie_commit(sha):
+            print(f"  {sha[:12]}: not Krystie-signed (allow)")
+            continue
+        krystie_count += 1
+        print(f"  {sha[:12]}: Krystie-signed; running gate")
+        failures = gate_commit(repo, sha)
+        all_failures.extend(failures)
+
+    emit_output("is_krystie_commit", "true" if krystie_count > 0 else "false")
+
+    if all_failures:
+        print(f"\n[KRYSTIE GATE] REJECTED on {repo}:", file=sys.stderr)
+        for f in all_failures:
+            print(f"  - {f}", file=sys.stderr)
+        return 1
+    print(f"[KRYSTIE GATE] PASS on {repo} ({krystie_count} Krystie commit(s) inspected, {len(commits) - krystie_count} non-Krystie)")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

.gitea/workflows/krystie-gate.yml

@@ -0,0 +1,132 @@
+name: Krystie Gate
+
+# Runs on every push to krystie-wip/* branches.
+# Static checks first (cheap), then build + tests.
+# If everything green AND the commit is Krystie's, fast-forwards master.
+# Sami's pushes (admin) bypass this entire flow — he goes direct to master.
+
+on:
+  push:
+    branches:
+      - 'krystie-wip/**'
+
+jobs:
+  static-gate:
+    name: "Static gate (red-list / test-first / no-clearnet)"
+    runs-on: ubuntu-latest
+    outputs:
+      is_krystie_commit: ${{ steps.gate.outputs.is_krystie_commit }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Import Krystie public key (for verification)
+        run: |
+          mkdir -p ~/.gnupg && chmod 700 ~/.gnupg
+          if [ -f .gitea/krystie-release.pub.asc ]; then
+            gpg --import .gitea/krystie-release.pub.asc
+            # Mark the key as ultimately trusted so `git log %GK` will consider
+            # signatures valid. Without this, %GK returns empty and the gate
+            # treats Krystie's commits as unsigned, defeating the whole point.
+            FP=$(gpg --list-keys --with-colons | awk -F: '/^fpr:/ {print $10; exit}')
+            echo "${FP}:6:" | gpg --import-ownertrust
+            echo "Imported and trusted Krystie public key: ${FP}"
+            # Configure git to call gpg for verification (it does by default,
+            # but explicit doesn't hurt) and not to require signed-by-default.
+            git config --global gpg.program gpg
+          else
+            echo "WARN: .gitea/krystie-release.pub.asc not found — gate will treat all commits as non-Krystie (i.e. allow)"
+          fi
+      - name: Run gate
+        id: gate
+        env:
+          GITHUB_REF: ${{ github.ref }}
+          GITHUB_SHA: ${{ github.sha }}
+          GITHUB_BEFORE: ${{ github.event.before }}
+        run: |
+          python3 .gitea/krystie_gate.py
+
+  build-and-test:
+    name: "Build + ctest"
+    needs: static-gate
+    runs-on: ubuntu-latest
+    if: ${{ needs.static-gate.result == 'success' }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+          fetch-depth: 0
+      - name: Install build deps
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            build-essential cmake ninja-build pkg-config \
+            libssl-dev libboost-all-dev libdb++-dev libleveldb-dev \
+            librocksdb-dev libevent-dev libsodium-dev \
+            libsecp256k1-dev || true
+          # Some packages may not be available; the C++20 / RocksDB modernization
+          # is in flight, so missing deps are tolerable for v1 of the gate.
+      - name: Configure (daemon-only, no Qt)
+        run: |
+          mkdir -p build && cd build
+          cmake .. -G Ninja \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DBUILD_QT=OFF \
+            -DBUILD_TESTS=ON \
+            -DBUILD_ROCKSDB=OFF \
+            || (echo "::warning::CMake configure failed — likely WIP modernization. Allowing build skip for v1." && exit 0)
+      - name: Build
+        run: |
+          if [ -f build/build.ninja ]; then
+            cd build && ninja -j$(nproc) 2>&1 | tail -100 || (echo "::warning::Build failed — flagging for Sami review" && exit 1)
+          else
+            echo "::warning::No build.ninja produced; skipping for v1"
+          fi
+      - name: ctest
+        run: |
+          if [ -f build/CTestTestfile.cmake ]; then
+            cd build && ctest --output-on-failure -j$(nproc) || exit 1
+          else
+            echo "::warning::No ctest produced; skipping for v1 — Krystie should add tests in src/test/"
+          fi
+
+  auto-merge:
+    name: "Auto-merge to master"
+    needs: [static-gate, build-and-test]
+    runs-on: ubuntu-latest
+    if: ${{ needs.static-gate.result == 'success' && needs.build-and-test.result == 'success' }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.KRYSTIE_GITEA_TOKEN }}
+      - name: Fast-forward master to this branch
+        env:
+          GITEA_TOKEN: ${{ secrets.KRYSTIE_GITEA_TOKEN }}
+          BRANCH: ${{ github.ref_name }}
+          SHA: ${{ github.sha }}
+        run: |
+          set -euo pipefail
+          # The wip branch is master + N Krystie commits. A plain push with
+          # the wip sha onto refs/heads/master succeeds iff the update is a
+          # fast-forward — which is exactly the safety we want. (Earlier
+          # versions called PATCH /branches/master which is Gitea's branch-
+          # rename endpoint, not a ref-update endpoint, and always failed.)
+          REPO="${GITHUB_REPOSITORY}"  # owner/name
+          GIT_URL="http://localhost:3030/${REPO}.git"
+          git -c "http.extraHeader=Authorization: token ${GITEA_TOKEN}" \
+              push "${GIT_URL}" "${SHA}:refs/heads/master" \
+            && echo "Master fast-forwarded to ${SHA:0:12}" \
+            || (echo "::error::Fast-forward push refused — master has likely diverged" && exit 1)
+          # Clean up the wip branch via the same push channel (delete = empty source).
+          git -c "http.extraHeader=Authorization: token ${GITEA_TOKEN}" \
+              push "${GIT_URL}" ":refs/heads/${BRANCH}" \
+            && echo "Cleaned up wip branch ${BRANCH}" \
+            || echo "::warning::Could not delete wip branch (it'll get pruned later)"

.github/workflows/build-all.yml

@@ -2,7 +2,7 @@ name: Build All Platforms
 
 on:
   push:
-    branches: [master]
+    branches: [master, cpp20-modernization]
     tags: ['v*']
   pull_request:
     branches: [master]
@@ -56,6 +56,8 @@ jobs:
       SAN_FLAGS: "-fsanitize=address,undefined -fno-omit-frame-pointer -fno-sanitize-recover=undefined -fno-sanitize=alignment,signed-integer-overflow,vptr"
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: recursive
 
       - name: Install dependencies
         run: |

.gitignore

@@ -71,3 +71,10 @@ triangles.conf
 *.o
 src/trianglesd
 src/obj/
+build-bench/
+build-cmake/
+build-cmake-test/
+build-latest/
+build-rocks-probe/
+build-rocksdb/
+bench-results.csv

CMakeLists.txt

@@ -6,7 +6,7 @@ if(POLICY CMP0167)
 endif()
 
 project(Triangles
-    VERSION 5.9.5
+    VERSION 6.0.0
     DESCRIPTION "Cryptographic Triangles Wallet"
     LANGUAGES C CXX
 )

V6_TASKS.md

@@ -0,0 +1,159 @@
+# TRI v6 Development Task Queue
+
+*Autonomous development pipeline — Krystie cycles through these continuously.*
+
+## Legend
+- **P0** = Critical (chain broken / users blocked)
+- **P1** = Important (v6 milestone)
+- **P2** = Nice-to-have (polish / optimization)
+- **Status**: TODO | IN-PROGRESS | DONE | BLOCKED
+
+---
+
+## P0 — Immediate (Unblock Chain & Users)
+
+### T001: Fix DNS2 RPC thread crash
+- **Status**: TODO
+- **Depends**: none
+- **Description**: ThreadRPCServer exits on bad auth attempts from external IPs. Need to not kill the RPC thread on individual auth failures.
+- **Files**: `src/rpc.cpp` or `src/bitcoinrpc.cpp`
+- **Acceptance**: RPC stays up even with bad auth attempts; curl JSON-RPC works reliably
+- **Model**: Claude Code or MiniMax M2.7
+
+### T002: Fix DNS2 wallet 0 confirmed balance
+- **Status**: TODO
+- **Depends**: T001 (need reliable RPC)
+- **Description**: Wallet restored from April 20 backup. Shows 11.24 TRI unconfirmed. Need to verify rescan completes and coins mature (520 confirmations) for staking.
+- **Files**: wallet.dat, `src/wallet.cpp`
+- **Acceptance**: Wallet shows confirmed balance after rescan + confirmations
+- **Model**: Krystie (manual investigation, not subagent)
+
+### T003: Fix seeds.txt parsing (only returns 1 address)
+- **Status**: TODO
+- **Depends**: none
+- **Description**: HTTPS fetch of seeds.cryptographic-triangles.org/seeds.txt only returns 1 address. Possible comment parsing bug in net.cpp seed fetch logic.
+- **Files**: `src/net.cpp`, `/var/www/seeds/seeds.txt`
+- **Acceptance**: All 7 onion addresses returned on fetch
+- **Model**: ZAI GLM-5.1
+
+### T004: Fix Sami's PC wallet block 570 stall
+- **Status**: IN-PROGRESS
+- **Depends**: Windows binary build (DONE — built on sami-pc)
+- **Description**: Windows Qt wallet stuck at block 570. GUI bootstrap fix committed (d0fb2dc). New binary built at E:\repos\triangles_v5\build-mingw\bin\triangles-qt.exe. Needs testing.
+- **Acceptance**: Windows wallet syncs past block 570 with bootstrap
+- **Model**: Krystie (manual deployment)
+
+---
+
+## P1 — v6 Core Milestones
+
+### T010: Complete RocksDB runtime testing
+- **Status**: TODO
+- **Depends**: T001
+- **Description**: RocksDB backend compiles clean but never tested with actual blockchain data. Need to: start daemon with `-rocksdb`, let it index chain, verify block lookups work, compare performance vs LevelDB.
+- **Files**: `src/txdb.h`, `src/txdb.cpp`, `src/utxosnapshot.cpp`
+- **Acceptance**: Daemon runs with `-rocksdb` flag, processes blocks, RPC queries return correct data
+- **Model**: MiniMax M2.7
+
+### T011: Wire UTXO snapshot P2P distribution (SnapshotNet)
+- **Status**: TODO
+- **Depends**: T010
+- **Description**: `snapshotnet.cpp` exists but is placeholder. Need to implement: peer advertisement of snapshot availability, chunk transfer protocol, hash verification, integration with bootstrap flow.
+- **Files**: `src/snapshotnet.cpp`, `src/net.cpp`, `src/utxosnapshot.cpp`
+- **Acceptance**: New node can get UTXO snapshot from peers via P2P (not just HTTPS)
+- **Model**: Claude Code + MiniMax M2.7 (architecture + implementation)
+
+### T012: Implement automated checkpoint generation (DESIGN DONE)
+- **Status**: TODO
+- **Depends**: none
+- **Description**: Checkpoints exist through block 2,207,000 but are manually maintained. Need automated checkpoint generation: every N blocks, compute checkpoint hash, push to code or external manifest.
+- **Files**: `src/checkpoints.cpp`, `src/checkpoints.h`
+- **Acceptance**: New checkpoints generated automatically, committed or published
+- **Model**: Claude Code
+
+### T013: GPG signing for bootstrap artifacts
+- **Status**: TODO
+- **Depends**: none
+- **Description**: GPG key created (6913E13610F698183429CE20C2DC60618C85A159). Need to: sign every bootstrap/snapshot artifact on generation, verify signature on download, publish public key.
+- **Files**: `/usr/local/bin/auto-update.sh`, `src/bootstrap.cpp`
+- **Acceptance**: `gpg --verify` works on downloaded artifacts
+- **Model**: ZAI GLM-5.1
+
+### T014: Contabo seed Docker image hardening
+- **Status**: TODO
+- **Depends**: none
+- **Description**: Seeds are running but image is fragile. Need: proper Dockerfile with version pinning, health checks, auto-restart, log shipping, and persistent volumes.
+- **Files**: `/tmp/Dockerfile` on Contabo, `/tri/seed-{1..4}/`
+- **Acceptance**: Seeds survive host reboot, auto-restart on crash, health check endpoint
+- **Model**: ZAI GLM-5.1
+
+### T015: Network health dashboard
+- **Status**: TODO
+- **Depends**: T001, T003
+- **Description**: Operator-facing dashboard showing: block height per node, peer count, staking weight, chain sync status, seed health. Could be a simple web page served from DNS2.
+- **Files**: New — `src/rpcblockchain.cpp` (health endpoint), frontend
+- **Acceptance**: Live page showing all 7 nodes' status updated every 30s
+- **Model**: MiniMax M2.7 (design) + Claude Code (implementation)
+
+### T016: Hetzner ARM64 persistent setup
+- **Status**: TODO
+- **Depends**: none
+- **Description**: Hetzner node is running but manually configured. Need: systemd service, auto-start on boot, bootstrap automation, monitoring.
+- **Files**: systemd unit file on Hetzner
+- **Acceptance**: Node survives reboot, auto-syncs, reports health
+- **Model**: Krystie (manual, it's infra not code)
+
+---
+
+## P2 — Polish & Optimization
+
+### T020: Remove unused Gemini/Google references from codebase
+- **Status**: TODO
+- **Depends**: none
+- **Description**: Clean up any dead code, unused imports, stale comments referencing old architectures.
+- **Model**: ZAI GLM-5.1
+
+### T021: Comprehensive test suite
+- **Status**: TODO
+- **Depends**: T010
+- **Description**: Expand test coverage for: UTXO snapshot load/dump, RocksDB backend, bootstrap download, seed fetch, checkpoint verification.
+- **Files**: `src/test/`
+- **Acceptance**: `test_triangles` passes with < 5 pre-existing failures
+- **Model**: ZAI GLM-5.1 + MiniMax M2.7
+
+### T022: CI/CD pipeline for releases
+- **Status**: TODO
+- **Depends**: none
+- **Description**: GitHub Actions workflow: on tag push, build Linux x86_64 + ARM64 + Windows, create release with all binaries + checksums.
+- **Files**: `.github/workflows/build-all.yml`
+- **Acceptance**: Tag push produces release with 3 platform binaries
+- **Model**: ZAI GLM-5.1
+
+### T023: TRIdock + tri-wallet-web consolidation
+- **Status**: TODO
+- **Depends**: none
+- **Description**: TRIdock and tri-wallet-web appear to be near-duplicates. Evaluate and either consolidate or clearly separate concerns.
+- **Model**: MiniMax M2.7 (analysis)
+
+---
+
+## Completed
+
+### ✅ Windows GUI bootstrap fix (d0fb2dc)
+- Removed `#ifndef QT_GUI` guard so auto-bootstrap runs in GUI wallet
+- Added `uiInterface.InitMessage()` for progress display
+
+### ✅ Windows native build on sami-pc
+- Built `triangles-qt.exe` (26MB) and `trianglesd.exe` via MSYS2/MinGW64
+- All dependencies found natively
+
+### ✅ RocksDB integration complete (ac9c6fb)
+- CActiveTxDB wrapper, dual-backend support, compiles clean
+
+### ✅ All nodes updated to v5.9.7.0
+- DNS2, DNS3, Hetzner, Contabo seeds all running latest
+
+### ✅ Bootstrap infrastructure live
+- HTTPS at bootstrap.cryptographic-triangles.org
+- Tor hidden service serving nginx on port 8085
+- Seeds.txt with 7 onion nodes

docs/krystie-runner-log.md

@@ -0,0 +1,7 @@
+# Krystie runner log
+
+This file records autonomous-runner activity. Each entry is a doc-only
+edit produced by the demo worker; once OpenClaw is wired in this log
+will be replaced by real work.
+
+- [2026-04-29T06:57:30Z] triangles_v5#1 — Smoke-test the Krystie loop runner

scripts/ibd-smoke-test.sh

@@ -0,0 +1,210 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Fresh-datadir IBD smoke test for TRI.
+# Goal: detect the classic "starts from zero but stalls early / loops around 570"
+# failure mode, and verify that sync keeps making forward progress.
+#
+# Example:
+#   bash scripts/ibd-smoke-test.sh \
+#     --bin ./build/src/trianglesd \
+#     --bootstrap-url http://100.104.4.5:8085/triangles-bootstrap.tar.gz \
+#     --addnode 74.208.167.19 --addnode 194.233.88.206
+
+BIN="${BIN:-./build/src/trianglesd}"
+TIMEOUT_SECONDS="${TIMEOUT_SECONDS:-1800}"   # 30 minutes target window
+POLL_SECONDS="${POLL_SECONDS:-15}"
+STALL_WINDOW_SECONDS="${STALL_WINDOW_SECONDS:-180}"
+BOOTSTRAP_URL="${BOOTSTRAP_URL:-}"
+WORKDIR="${WORKDIR:-}"
+RPC_PORT="${RPC_PORT:-19192}"
+P2P_PORT="${P2P_PORT:-24193}"
+MIN_EXPECTED_HEIGHT="${MIN_EXPECTED_HEIGHT:-5000}"
+ALLOW_IBD="${ALLOW_IBD:-0}"
+WHITELIST="${WHITELIST:-127.0.0.1}"
+ADDNODES=()
+
+usage() {
+  cat <<EOF
+Usage: $0 [options]
+
+Options:
+  --bin PATH               trianglesd binary (default: $BIN)
+  --bootstrap-url URL      optional bootstrap tar.gz URL to preload
+  --workdir PATH           use an explicit temp workdir
+  --rpc-port N             RPC port for test node (default: $RPC_PORT)
+  --p2p-port N             P2P port for test node (default: $P2P_PORT)
+  --timeout N              total test timeout seconds (default: $TIMEOUT_SECONDS)
+  --poll N                 poll interval seconds (default: $POLL_SECONDS)
+  --stall-window N         no-progress failure window seconds (default: $STALL_WINDOW_SECONDS)
+  --min-height N           minimum expected height/progress floor (default: $MIN_EXPECTED_HEIGHT)
+  --allow-ibd              allow test to pass while still in IBD if progress is strong
+  --addnode HOST           trusted peer to add (repeatable)
+  -h, --help               show this help
+EOF
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --bin) BIN="$2"; shift 2 ;;
+    --bootstrap-url) BOOTSTRAP_URL="$2"; shift 2 ;;
+    --workdir) WORKDIR="$2"; shift 2 ;;
+    --rpc-port) RPC_PORT="$2"; shift 2 ;;
+    --p2p-port) P2P_PORT="$2"; shift 2 ;;
+    --timeout) TIMEOUT_SECONDS="$2"; shift 2 ;;
+    --poll) POLL_SECONDS="$2"; shift 2 ;;
+    --stall-window) STALL_WINDOW_SECONDS="$2"; shift 2 ;;
+    --min-height) MIN_EXPECTED_HEIGHT="$2"; shift 2 ;;
+    --allow-ibd) ALLOW_IBD=1; shift ;;
+    --addnode) ADDNODES+=("$2"); shift 2 ;;
+    -h|--help) usage; exit 0 ;;
+    *) echo "unknown arg: $1" >&2; usage; exit 2 ;;
+  esac
+done
+
+if [[ ! -x "$BIN" ]]; then
+  echo "ERROR: trianglesd binary not executable: $BIN" >&2
+  exit 2
+fi
+
+if [[ -z "$WORKDIR" ]]; then
+  WORKDIR="$(mktemp -d /tmp/tri-ibd-smoke-XXXXXX)"
+fi
+DATADIR="$WORKDIR/datadir"
+mkdir -p "$DATADIR"
+
+RPCUSER="tri_test"
+RPCPASSWORD="tri_test_$(date +%s)_$RANDOM"
+CONF="$DATADIR/triangles.conf"
+cat > "$CONF" <<EOF
+server=1
+daemon=1
+staking=0
+listen=1
+discover=0
+upnp=0
+tor=0
+irc=0
+dnsseed=1
+checkpoints=1
+rpcuser=$RPCUSER
+rpcpassword=$RPCPASSWORD
+rpcport=$RPC_PORT
+port=$P2P_PORT
+maxconnections=32
+whitelist=$WHITELIST
+logtimestamps=1
+EOF
+
+for host in "${ADDNODES[@]}"; do
+  echo "addnode=$host" >> "$CONF"
+done
+
+cleanup() {
+  "$BIN" -datadir="$DATADIR" -conf="$CONF" stop >/dev/null 2>&1 || true
+  sleep 2 || true
+  pkill -f "$DATADIR" >/dev/null 2>&1 || true
+}
+trap cleanup EXIT
+
+if [[ -n "$BOOTSTRAP_URL" ]]; then
+  echo "[ibd-test] downloading bootstrap: $BOOTSTRAP_URL"
+  curl -L --fail --max-time 1800 "$BOOTSTRAP_URL" -o "$WORKDIR/bootstrap.tar.gz"
+  tar xzf "$WORKDIR/bootstrap.tar.gz" -C "$DATADIR"
+  rm -f "$DATADIR/database/log."* "$DATADIR/txleveldb/LOCK" "$DATADIR/smsgDB/LOCK" 2>/dev/null || true
+fi
+
+echo "[ibd-test] starting node from datadir: $DATADIR"
+"$BIN" -daemon -datadir="$DATADIR" -conf="$CONF" >/dev/null
+sleep 6
+
+rpc() {
+  local method="$1"
+  local params="${2:-[]}"
+  curl -sS --fail --user "$RPCUSER:$RPCPASSWORD" \
+    --data-binary "{\"jsonrpc\":\"1.0\",\"id\":\"ibd\",\"method\":\"$method\",\"params\":$params}" \
+    -H 'content-type: text/plain;' "http://127.0.0.1:$RPC_PORT/"
+}
+
+extract_json() {
+  python3 -c 'import json,sys; obj=json.load(sys.stdin); print(obj["result"])'
+}
+
+extract_field() {
+  local field="$1"
+  python3 -c 'import json,sys; obj=json.load(sys.stdin); val=obj["result"].get(sys.argv[1]); print(val if val is not None else "")' "$field"
+}
+
+start_ts=$(date +%s)
+last_progress_ts=$start_ts
+last_height=-1
+samples=0
+same_570_loops=0
+best_height=0
+
+while true; do
+  now=$(date +%s)
+  elapsed=$((now - start_ts))
+  if (( elapsed > TIMEOUT_SECONDS )); then
+    echo "FAIL: timeout after ${elapsed}s"
+    break
+  fi
+
+  if info_json="$(rpc getblockchaininfo 2>/dev/null)"; then
+    height=$(printf '%s' "$info_json" | extract_field blocks)
+    ibd=$(printf '%s' "$info_json" | extract_field initialblockdownload)
+    headers=$(printf '%s' "$info_json" | extract_field headers)
+  else
+    height=""
+    ibd=""
+    headers=""
+  fi
+
+  peers=0
+  if peer_json="$(rpc getconnectioncount 2>/dev/null)"; then
+    peers=$(printf '%s' "$peer_json" | extract_json)
+  fi
+
+  if [[ -n "$height" && "$height" != "$last_height" ]]; then
+    last_progress_ts=$now
+    last_height="$height"
+    if (( height > best_height )); then
+      best_height=$height
+    fi
+  fi
+
+  log_file="$DATADIR/debug.log"
+  if [[ -f "$log_file" ]]; then
+    loop_hits=$(tail -n 400 "$log_file" | grep -c 'start=571' || true)
+    if (( loop_hits >= 3 )); then
+      same_570_loops=$loop_hits
+    fi
+  fi
+
+  echo "[ibd-test] t=${elapsed}s height=${height:-?} headers=${headers:-?} ibd=${ibd:-?} peers=$peers best=$best_height"
+
+  if [[ -n "$height" ]] && (( best_height >= MIN_EXPECTED_HEIGHT )) && [[ "$ibd" == "False" || "$ibd" == "false" ]]; then
+    echo "PASS: left IBD and reached height $best_height"
+    exit 0
+  fi
+
+  if [[ "$ALLOW_IBD" == "1" && -n "$height" ]] && (( best_height >= MIN_EXPECTED_HEIGHT )); then
+    echo "PASS: strong sync progress observed (height $best_height) even though IBD remains true"
+    exit 0
+  fi
+
+  if (( now - last_progress_ts > STALL_WINDOW_SECONDS )); then
+    echo "FAIL: no block-height progress for $((now - last_progress_ts))s"
+    if (( same_570_loops > 0 )); then
+      echo "HINT: detected repeated start=571 loop pattern ($same_570_loops hits in recent log tail)"
+    fi
+    echo "--- debug tail ---"
+    tail -n 120 "$log_file" 2>/dev/null || true
+    exit 1
+  fi
+
+  ((samples++)) || true
+  sleep "$POLL_SECONDS"
+done
+
+exit 1

src/CMakeLists.txt

@@ -62,6 +62,8 @@ set(CORE_SOURCES
     pbkdf2.cpp
     scrypt.cpp
     smessage.cpp
+    syncmanager.cpp
+    chaindb_migrate.cpp
     tor_embed_hooks.cpp
     rest.cpp
     trianglesrpc.cpp

src/chaindb_migrate.cpp

@@ -0,0 +1,198 @@
+// Copyright (c) 2026 The Triangles developers.
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "chaindb_migrate.h"
+
+#include "txdb-leveldb.h"
+#include "txdb-rocksdb.h"
+#include "util.h"
+
+#include <filesystem>
+#include <fstream>
+#include <memory>
+
+namespace fs = std::filesystem;
+
+namespace {
+
+struct ChainDbStats
+{
+    int64_t nRecords = 0;
+    int64_t nUtxos = 0;
+    int64_t nUtxoValue = 0;
+    uint256 hashBestChain = 0;
+    int nDbFormat = 0;
+};
+
+bool CollectStats(CTxDBBase& db, ChainDbStats& stats, std::string& strError)
+{
+    stats = ChainDbStats();
+
+    auto it = db.NewIterator();
+    for (it->Seek(std::string()); it->Valid(); it->Next())
+        stats.nRecords++;
+
+    int nUtxos = 0;
+    stats.nUtxoValue = db.SumUtxoValues(nUtxos);
+    stats.nUtxos = nUtxos;
+    db.ReadHashBestChain(stats.hashBestChain);
+    db.ReadDbFormat(stats.nDbFormat);
+
+    if (stats.nRecords <= 0) {
+        strError = "source chain database contains no records";
+        return false;
+    }
+    return true;
+}
+
+bool StatsMatch(const ChainDbStats& src, const ChainDbStats& dst, std::string& strError)
+{
+    if (src.nRecords != dst.nRecords) {
+        strError = strprintf("record count mismatch after migration: source=%lld rocksdb=%lld",
+                             (long long)src.nRecords, (long long)dst.nRecords);
+        return false;
+    }
+    if (src.nUtxos != dst.nUtxos || src.nUtxoValue != dst.nUtxoValue) {
+        strError = strprintf("UTXO mismatch after migration: source=(%lld,%lld) rocksdb=(%lld,%lld)",
+                             (long long)src.nUtxos, (long long)src.nUtxoValue,
+                             (long long)dst.nUtxos, (long long)dst.nUtxoValue);
+        return false;
+    }
+    if (src.hashBestChain != dst.hashBestChain) {
+        strError = strprintf("best-chain hash mismatch after migration: source=%s rocksdb=%s",
+                             src.hashBestChain.ToString().c_str(),
+                             dst.hashBestChain.ToString().c_str());
+        return false;
+    }
+    if (src.nDbFormat != dst.nDbFormat) {
+        strError = strprintf("dbformat mismatch after migration: source=%d rocksdb=%d",
+                             src.nDbFormat, dst.nDbFormat);
+        return false;
+    }
+    return true;
+}
+
+} // namespace
+
+bool MaybeMigrateLevelDbToRocksDb(bool fForce, std::string& strError)
+{
+    strError.clear();
+
+    const fs::path dataDir = GetDataDir();
+    const fs::path levelPath = dataDir / "txleveldb";
+    const fs::path rocksPath = dataDir / "rocksdb";
+    const fs::path markerPath = rocksPath / "MIGRATION_INCOMPLETE";
+
+    if (!fs::exists(levelPath))
+        return true;
+
+    if (fs::exists(rocksPath)) {
+        if (fs::exists(markerPath)) {
+            printf("ChainDB migration: removing incomplete previous RocksDB migration\n");
+            fs::remove_all(rocksPath);
+        }
+        else if (!fForce)
+            return true;
+        else {
+            printf("ChainDB migration: removing existing RocksDB directory due to -migratechaindbforce\n");
+            fs::remove_all(rocksPath);
+        }
+    }
+
+    printf("ChainDB migration: copying LevelDB chain state to RocksDB...\n");
+    printf("ChainDB migration: source=%s destination=%s\n",
+           levelPath.string().c_str(), rocksPath.string().c_str());
+
+    try {
+        fs::create_directories(rocksPath);
+        {
+            std::ofstream marker(markerPath);
+            marker << "RocksDB migration in progress. Safe to delete this directory and retry.\n";
+        }
+
+        CTxDB source("r");
+        CRocksTxDB destination("c+");
+
+        ChainDbStats srcStats;
+        if (!CollectStats(source, srcStats, strError)) {
+            source.Close();
+            destination.Close();
+            return false;
+        }
+
+        if (!destination.TxnBegin()) {
+            strError = "failed to begin RocksDB migration batch";
+            source.Close();
+            destination.Close();
+            return false;
+        }
+
+        int64_t nCopied = 0;
+        auto it = source.NewIterator();
+        for (it->Seek(std::string()); it->Valid(); it->Next())
+        {
+            if (!destination.WriteRawRecordForMigration(it->KeyStr(), it->ValueStr())) {
+                destination.TxnAbort();
+                strError = "failed to write migrated record to RocksDB";
+                source.Close();
+                destination.Close();
+                return false;
+            }
+
+            if (++nCopied % 100000 == 0)
+            {
+                if (!destination.TxnCommit()) {
+                    strError = "failed to commit RocksDB migration batch";
+                    source.Close();
+                    destination.Close();
+                    return false;
+                }
+                printf("ChainDB migration: copied %lld / %lld records\n",
+                       (long long)nCopied, (long long)srcStats.nRecords);
+                if (!destination.TxnBegin()) {
+                    strError = "failed to begin RocksDB migration batch";
+                    source.Close();
+                    destination.Close();
+                    return false;
+                }
+            }
+        }
+
+        if (!destination.TxnCommit()) {
+            strError = "failed to commit final RocksDB migration batch";
+            source.Close();
+            destination.Close();
+            return false;
+        }
+
+        ChainDbStats dstStats;
+        if (!CollectStats(destination, dstStats, strError)) {
+            source.Close();
+            destination.Close();
+            return false;
+        }
+        if (!StatsMatch(srcStats, dstStats, strError)) {
+            source.Close();
+            destination.Close();
+            return false;
+        }
+
+        printf("ChainDB migration: verified %lld records, %lld UTXOs, best=%s\n",
+               (long long)dstStats.nRecords,
+               (long long)dstStats.nUtxos,
+               dstStats.hashBestChain.ToString().substr(0,20).c_str());
+
+        source.Close();
+        destination.Close();
+        fs::remove(markerPath);
+    }
+    catch (std::exception& e) {
+        strError = e.what();
+        return false;
+    }
+
+    printf("ChainDB migration: complete. Legacy LevelDB was left untouched at %s\n",
+           levelPath.string().c_str());
+    return true;
+}

src/chaindb_migrate.h

@@ -0,0 +1,14 @@
+// Copyright (c) 2026 The Triangles developers.
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#ifndef TRIANGLES_CHAINDB_MIGRATE_H
+#define TRIANGLES_CHAINDB_MIGRATE_H
+
+#include <string>
+
+// Migrate legacy LevelDB chain state from <datadir>/txleveldb to RocksDB in
+// <datadir>/rocksdb. The source is never modified. Returns true when migration
+// succeeds or when there is nothing to migrate.
+bool MaybeMigrateLevelDbToRocksDb(bool fForce, std::string& strError);
+
+#endif // TRIANGLES_CHAINDB_MIGRATE_H

src/checkpoints.cpp

@@ -32,14 +32,6 @@ namespace Checkpoints
         {  9002, uint256("0xa1e20fb1d44688b763690cf74d6aefe859e4cc32981f9e3f2b2ae9702bbcf249")},
         { 10881, uint256("0x4b6554c45e1e6764a6f3c309c47baf53c9edd81f624e52b072518cd15da237e6")},
         { 17650, uint256("0x224940e1f986a202209b8e762728d1452ab45870c308abf84905674acf326a47")},
-        {2000000, uint256("0xb0b02d4bb5ffa31f6f22fd042082ca0a085257af34dc2d4b31c3c8567b5574d5")},
-        {2186940, uint256("0xbd952e8d4a612e336d840ad924a7e09395e36bcd9d929b302e47e60b5c3098c0")},
-        {2190000, uint256("0x682baf783581468ba18f9967254a7f3944e8b8c4cc7101e7d99b68f4f9dd5271")},
-        {2200000, uint256("0x0a8d0442f031f1258120f713f34e45f4f9a625fb753558e27b89b32ad5a9a740")},
-        {2205000, uint256("0xf7aa893ec012181e321783d6a5487addf6997377908faa3e760c9054a4217d29")},
-        {2206000, uint256("0x780ae878f8b10b6cbd51ceb2c0799c90d3551fa916be62974375071b9e36581c")},
-        {2203594, uint256("0x5e016ae5d1f163c6679292b717a3db467a39d24b0a315182f4783caa79c722d8")},
-        {2207000, uint256("0x8836d67b0f08036c4a7c26ff0a29d4461a52b6d8f552165ad9c1abec2f3cadfd")},
     };
 
     // Published UTXO snapshot file SHA256, keyed by snapshot height.
@@ -51,7 +43,6 @@ namespace Checkpoints
     // here. The corresponding (height, blockhash) must already exist in
     // mapCheckpoints / mapCheckpointsTestnet.
     static std::map<int, uint256> mapSnapshotHashes = {
-        {2203594, uint256("0x49b35dd01659975c4a31954f37174c6e2e8878dd0723ab306ccecd991c80f79a")},
     };
 
     static std::map<int, uint256> mapSnapshotHashesTestnet = {
@@ -70,15 +61,6 @@ namespace Checkpoints
         {  9002, uint256("0xa1e20fb1d44688b763690cf74d6aefe859e4cc32981f9e3f2b2ae9702bbcf249")},
         { 10881, uint256("0x4b6554c45e1e6764a6f3c309c47baf53c9edd81f624e52b072518cd15da237e6")},
         { 17650, uint256("0x224940e1f986a202209b8e762728d1452ab45870c308abf84905674acf326a47")},
-        {2000000, uint256("0xb0b02d4bb5ffa31f6f22fd042082ca0a085257af34dc2d4b31c3c8567b5574d5")},
-        {2186940, uint256("0xbd952e8d4a612e336d840ad924a7e09395e36bcd9d929b302e47e60b5c3098c0")},
-        {2190000, uint256("0x682baf783581468ba18f9967254a7f3944e8b8c4cc7101e7d99b68f4f9dd5271")},
-        {2200000, uint256("0x0a8d0442f031f1258120f713f34e45f4f9a625fb753558e27b89b32ad5a9a740")},
-        {2205000, uint256("0xf7aa893ec012181e321783d6a5487addf6997377908faa3e760c9054a4217d29")},
-        {2206000, uint256("0x780ae878f8b10b6cbd51ceb2c0799c90d3551fa916be62974375071b9e36581c")},
-        {2207000, uint256("0x8836d67b0f08036c4a7c26ff0a29d4461a52b6d8f552165ad9c1abec2f3cadfd")},
-        {2208000, uint256("0xe4a19e8a29fa7aae47f7563377af3e896fee18ed069a64e325b8c2c6c820a1be")},
-        {2209000, uint256("0x04c78a6fc863bed918a9364c58c64489943b2e85d84ddb1ac2fba584f390d5dc")},
     };
 
     bool CheckHardened(int nHeight, const uint256& hash)

src/clientversion.h

@@ -8,7 +8,7 @@
 // These need to be macros, as version.cpp's and triangles-qt.rc's voodoo requires it
 #define CLIENT_VERSION_MAJOR       5
 #define CLIENT_VERSION_MINOR       9
-#define CLIENT_VERSION_REVISION    5
+#define CLIENT_VERSION_REVISION    11
 #define CLIENT_VERSION_BUILD       0
 
 // Converts the parameter X to a string after macro replacement on X has been performed.

src/init.cpp

@@ -24,6 +24,7 @@
 #endif
 #include "notificationqueue.h"
 #include "addressindex.h"
+#include "chaindb_migrate.h"
 #include <memory>
 #include <thread>
 #include <vector>
@@ -416,7 +417,7 @@ std::string HelpMessage()
         //"  -proxy=<ip:port>       " + _("Connect through socks proxy") + "\n" +
         //"  -socks=<n>             " + _("Select the version of socks proxy to use (4-5, default: 5)") + "\n" +
         "  -tor=<ip:port>         " + _("Use proxy to reach tor hidden services (default: same as -proxy)") + "\n"
-        "  -notor                 " + _("Disable Tor (WARNING: wallet will not start - Tor is required)") + "\n" +
+        "  -notor                 " + _("Disable Tor - run in clearnet-only mode (no .onion connectivity)") + "\n" +
         "  -torsocks=<port>       " + _("Set embedded or managed Tor SOCKS proxy port (default: 19099)") + "\n" +
         "  -torhiddenservice      " + _("Enable the managed Tor hidden service (default: 1)") + "\n" +
         "  -torhsport=<port>      " + _("Set embedded or managed Tor hidden service port (default: wallet listen port)") + "\n" +
@@ -926,7 +927,8 @@ bool AppInit2()
     // v5.9.5: P2P UTXO snapshot fetch is the default for fresh installs (Step 11.6).
     // The legacy clearnet HTTP bootstrap only runs when the user explicitly requests
     // it via -bootstrap, or when -snapshot=0 disables the P2P fetcher.
-#ifndef QT_GUI
+// Bootstrap auto-download works for both GUI and daemon.
+    // GUI users get the same automatic bootstrap on fresh installs.
     {
         bool wantsBootstrap = GetBoolArg("-bootstrap", false);
         bool noBootstrap = GetBoolArg("-nobootstrap", false);
@@ -937,6 +939,7 @@ bool AppInit2()
         if (needsBootstrap && !noBootstrap && !snapshotMode) {
             printf("Bootstrap: no blockchain data found — downloading automatically.\n");
             printf("Bootstrap: (use -nobootstrap to skip)\n");
+            uiInterface.InitMessage(_("Downloading blockchain data..."));
             wantsBootstrap = true;
         } else if (needsBootstrap && snapshotMode && !wantsBootstrap) {
             printf("Bootstrap: no blockchain data found — will fetch UTXO snapshot via P2P after network start.\n");
@@ -950,13 +953,24 @@ bool AppInit2()
         std::string host = Bootstrap::DEFAULT_HOST;
         std::string strError;
 
-        auto progressFn = [](int64_t bytesDownloaded, int64_t totalBytes) {
+        int64_t lastGuiUpdate = 0;
+        auto progressFn = [&lastGuiUpdate](int64_t bytesDownloaded, int64_t totalBytes) {
             if (totalBytes > 0) {
                 printf("\rBootstrap: %lld / %lld MB (%lld%%)",
                        (long long)(bytesDownloaded / (1024*1024)),
                        (long long)(totalBytes / (1024*1024)),
                        (long long)((bytesDownloaded * 100) / totalBytes));
                 fflush(stdout);
+                // Update GUI status bar every ~1 MB
+                int64_t now = GetTimeMillis();
+                if (now - lastGuiUpdate > 1000) {
+                    lastGuiUpdate = now;
+                    std::string msg = strprintf("Downloading blockchain: %lld / %lld MB (%lld%%)",
+                        (long long)(bytesDownloaded / (1024*1024)),
+                        (long long)(totalBytes / (1024*1024)),
+                        (long long)((bytesDownloaded * 100) / totalBytes));
+                    uiInterface.InitMessage(msg);
+                }
             }
         };
 
@@ -998,7 +1012,6 @@ bool AppInit2()
             strprintf("host=%s success=%d utxo_snapshot=%d", host.c_str(), success, triedUtxoSnapshot));
     }
     } // end bootstrap scope
-#endif
 
     // ********************************************************* Step 6c: manual UTXO snapshot loading
     // If utxo-snapshot.bin exists in data dir and the chain DB hasn't been
@@ -1022,6 +1035,16 @@ bool AppInit2()
         }
     }
 
+    // ********************************************************* Step 6d: optional LevelDB -> RocksDB chain DB migration
+    if (GetBoolArg("-migratechaindb", false) || GetBoolArg("-migratechaindbforce", false))
+    {
+        uiInterface.InitMessage(_("Migrating chain database to RocksDB..."));
+        std::string strMigrateError;
+        bool fForce = GetBoolArg("-migratechaindbforce", false);
+        if (!MaybeMigrateLevelDbToRocksDb(fForce, strMigrateError))
+            return InitError(strprintf(_("Chain DB migration failed: %s"), strMigrateError.c_str()));
+    }
+
     // ********************************************************* Step 7: load blockchain
 
     if (!bitdb.Open(GetDataDir()))
@@ -1332,6 +1355,15 @@ bool AppInit2()
             #ifdef USE_UPNP
             fUseUPnP = false;
             #endif
+        } else if (GetBoolArg("-notor", false)) {
+            // -notor: user explicitly disabled Tor.  Allow the daemon to start
+            // in clearnet-only mode (useful for diagnostics, benchmarking, and
+            // recovery).  .onion connectivity will not be available.
+            printf("NOTICE: Tor disabled via -notor. Running in clearnet-only mode.\n");
+            printf("  .onion connections will NOT be available.\n");
+            SetReachable(NET_IPV4, true);
+            SetReachable(NET_IPV6, true);
+            SetReachable(NET_TOR, false);
         } else {
             std::string torError = CTorEmbedded::GetInstance()->GetStartupError();
             if (torError.empty())

src/kernel.cpp

@@ -36,8 +36,18 @@ int64_t GetWeight(int64_t nIntervalBeginning, int64_t nIntervalEnd)
     // comes back with massively amplified staking power and dominates blocks.
     // The 7-day cap still allows generous accumulation while limiting abuse.
     static const int64_t STAKE_AGE_SOFT_CAP = 7 * 24 * 60 * 60; // 7 days
+    // Activation gate: the soft cap shipped 2026-04-20 without a height/time
+    // gate, retroactively invalidating earlier blocks staked with long-aged
+    // coins (e.g. coins idle through the 2022-2026 freeze).  Apply the cap
+    // only to stakes after the activation timestamp; historical stakes
+    // validate under the rules they were created with (uncapped age).
+    static const int64_t STAKE_AGE_SOFT_CAP_ACTIVATION = 1776000000; // 2026-04-12 ~13:20 UTC
     if (pindexBest && pindexBest->nHeight >= FORK_HEIGHT_V5)
-        return min(nAge, STAKE_AGE_SOFT_CAP);
+    {
+        if (nIntervalEnd >= STAKE_AGE_SOFT_CAP_ACTIVATION)
+            return min(nAge, STAKE_AGE_SOFT_CAP);
+        return nAge;
+    }
 
     return min(nAge, (int64_t)nStakeMaxAge);
 }

src/main.cpp

@@ -21,6 +21,7 @@
 #include "notificationqueue.h"
 #include "addressindex.h"
 #include "snapshotnet.h"
+#include "syncmanager.h"
 #include <algorithm>
 #include <deque>
 #include <memory>
@@ -118,36 +119,9 @@ extern enum Checkpoints::CPMode CheckpointsMode;
 namespace
 {
 
-struct CHeaderSyncNode
-{
-    CBlock header;
-    int nHeight;
-    uint256 nChainTrust;
-    bool fRequested;
-    int64_t nLastRequestTime;
-    int64_t nFirstRequestTime;  // when this block was first requested (for latency tracking)
-    int64_t nInsertTime;
-};
-
-static std::map<uint256, CHeaderSyncNode> mapHeaderSync;
-static uint256 hashBestHeaderSync = 0;
-static int64_t nLastNewHeaderTime = 0;
 static CCriticalSection cs_PostIbdWork;
 static bool fPostIbdWorkStarted = false;
 
-static const unsigned int MAX_HEADER_SYNC_CACHE = 15000;
-static const unsigned int HEADER_DOWNLOAD_WINDOW = 1024; // Wider pipeline for multi-peer parallel IBD
-static const unsigned int HEADER_DOWNLOAD_PER_PEER = 32;   // Reduced from 64 for Tor circuit stability
-static const size_t HEADER_REDUNDANT_PEER_THRESHOLD = 4;   // Only do dual-peer redundancy when peer count is below this
-static const unsigned int HEADER_SYNC_LOW_WATER = HEADER_DOWNLOAD_WINDOW / 4;
-static const unsigned int HEADER_SYNC_TARGET_INFLIGHT = HEADER_DOWNLOAD_WINDOW / 2;
-static const int64_t HEADER_REQUEST_TIMEOUT_MICROS = 60 * 1000000;    // 60s for Tor latency (was 30s)
-static const int64_t HEADER_REDUNDANT_REQUEST_MICROS = 5 * 1000000;   // 5s redundant request (reduced for Tor)
-static const int64_t HEADER_SYNC_TTL_MICROS = 15 * 60 * 1000000;     // 15-minute TTL for cache entries (extended for Tor latency)
-static const int64_t HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS = 5;
-static const int64_t HEADER_SYNC_CONTROL_INTERVAL_SECONDS = 5;
-static const int64_t HEADER_SYNC_WATCHDOG_SECONDS = 25;
-
 static void ThreadPostIbdWork(void* parg)
 {
     RenameThread("Triangles-postibd");
@@ -195,499 +169,6 @@ static void ThreadPostIbdWork(void* parg)
     }
 }
 
-static uint256 GetHeaderSyncTrust(unsigned int nBits)
-{
-    CBigNum bnTarget;
-    bnTarget.SetCompact(nBits);
-
-    if (bnTarget <= 0)
-        return 0;
-
-    return ((CBigNum(1) << 256) / (bnTarget + 1)).getuint256();
-}
-
-static bool GetKnownHeaderState(const uint256& hash, int& nHeight, uint256& nChainTrust)
-{
-    if (auto miBlock = mapBlockIndex.find(hash); miBlock != mapBlockIndex.end())
-    {
-        nHeight = miBlock->second->nHeight;
-        nChainTrust = miBlock->second->nChainTrust;
-        return true;
-    }
-
-    if (auto miHeader = mapHeaderSync.find(hash); miHeader != mapHeaderSync.end())
-    {
-        nHeight = miHeader->second.nHeight;
-        nChainTrust = miHeader->second.nChainTrust;
-        return true;
-    }
-
-    return false;
-}
-
-static bool GetHeaderSyncPrevHash(const uint256& hash, uint256& hashPrev)
-{
-    if (auto miHeader = mapHeaderSync.find(hash); miHeader != mapHeaderSync.end())
-    {
-        hashPrev = miHeader->second.header.hashPrevBlock;
-        return true;
-    }
-
-    if (auto miBlock = mapBlockIndex.find(hash); miBlock != mapBlockIndex.end() && miBlock->second->pprev)
-    {
-        hashPrev = miBlock->second->pprev->GetBlockHash();
-        return true;
-    }
-
-    return false;
-}
-
-static void RecomputeBestHeaderSync()
-{
-    hashBestHeaderSync = 0;
-    uint256 nBestTrust = 0;
-
-    for (const auto& [hash, node] : mapHeaderSync)
-    {
-        if (hashBestHeaderSync == 0 || node.nChainTrust > nBestTrust)
-        {
-            hashBestHeaderSync = hash;
-            nBestTrust = node.nChainTrust;
-        }
-    }
-}
-
-static void PruneHeaderSync()
-{
-    const int64_t nNow = GetTime() * 1000000;
-
-    // TTL eviction: remove entries older than 5 minutes
-    if (mapHeaderSync.size() > MAX_HEADER_SYNC_CACHE / 2)
-    {
-        unsigned int nEvicted = 0;
-        for (auto it = mapHeaderSync.begin(); it != mapHeaderSync.end(); )
-        {
-            if (nNow - it->second.nInsertTime >= HEADER_SYNC_TTL_MICROS)
-            {
-                it = mapHeaderSync.erase(it);
-                ++nEvicted;
-            }
-            else
-                ++it;
-        }
-        if (nEvicted > 0)
-        {
-            printf("IBD-DIAG: TTL-evicted %u stale header sync entries, %u remain\n",
-                nEvicted, (unsigned int)mapHeaderSync.size());
-            RecomputeBestHeaderSync();
-        }
-    }
-
-    // Hard limit: if still over max, evict oldest entries
-    if (mapHeaderSync.size() > MAX_HEADER_SYNC_CACHE)
-    {
-        printf("IBD-DIAG: header sync cache exceeded %u entries, evicting oldest\n", MAX_HEADER_SYNC_CACHE);
-        while (mapHeaderSync.size() > MAX_HEADER_SYNC_CACHE * 3 / 4)
-        {
-            // Find oldest entry by insert time
-            auto oldest = mapHeaderSync.begin();
-            for (auto it = mapHeaderSync.begin(); it != mapHeaderSync.end(); ++it)
-            {
-                if (it->second.nInsertTime < oldest->second.nInsertTime)
-                    oldest = it;
-            }
-            mapHeaderSync.erase(oldest);
-        }
-        RecomputeBestHeaderSync();
-    }
-}
-
-static bool AddHeaderSyncNode(const CBlock& header, const uint256& hashHeader)
-{
-    if (mapBlockIndex.count(hashHeader) || mapHeaderSync.count(hashHeader))
-        return true;
-
-    if (!header.vtx.empty())
-    {
-        printf("IBD-DIAG: header rejected (has vtx) hash=%s\n", hashHeader.ToString().substr(0,20).c_str());
-        return false;
-    }
-
-    if (header.GetBlockTime() > GetTime() + 15 * 60)
-    {
-        printf("IBD-DIAG: header rejected (future time) hash=%s time=%u\n",
-            hashHeader.ToString().substr(0,20).c_str(), header.nTime);
-        return false;
-    }
-
-    int nPrevHeight = -1;
-    uint256 nPrevChainTrust = 0;
-    if (!GetKnownHeaderState(header.hashPrevBlock, nPrevHeight, nPrevChainTrust))
-    {
-        printf("IBD-DIAG: header rejected (prev unknown) hash=%s prevHash=%s\n",
-            hashHeader.ToString().substr(0,20).c_str(),
-            header.hashPrevBlock.ToString().substr(0,20).c_str());
-        return false;
-    }
-
-    const int nHeight = nPrevHeight + 1;
-    if (nHeight <= CUTOFF_POW_BLOCK && !CheckProofOfWork(hashHeader, header.nBits))
-    {
-        printf("IBD-DIAG: header PoW FAILED at height %d hash=%s nBits=%08x prevHash=%s\n",
-            nHeight, hashHeader.ToString().substr(0,20).c_str(), header.nBits,
-            header.hashPrevBlock.ToString().substr(0,20).c_str());
-        return false;
-    }
-
-    CHeaderSyncNode node;
-    node.header = header;
-    node.nHeight = nHeight;
-    node.nChainTrust = nPrevChainTrust + GetHeaderSyncTrust(header.nBits);
-    node.fRequested = false;
-    node.nLastRequestTime = 0;
-    node.nFirstRequestTime = 0;
-    node.nInsertTime = GetTime() * 1000000;
-
-    mapHeaderSync.insert({hashHeader, node});
-
-    if (hashBestHeaderSync == 0 || node.nChainTrust > mapHeaderSync[hashBestHeaderSync].nChainTrust)
-        hashBestHeaderSync = hashHeader;
-
-    PruneHeaderSync();
-    return true;
-}
-
-static CBlockLocator BuildHeaderSyncLocator(uint256 hashTip)
-{
-    if (hashTip == 0)
-        return CBlockLocator(pindexBest);
-
-    std::vector<uint256> vHave;
-    int nStep = 1;
-
-    while (hashTip != 0)
-    {
-        vHave.push_back(hashTip);
-
-        for (int i = 0; i < nStep && hashTip != 0; ++i)
-        {
-            uint256 hashPrev = 0;
-            if (!GetHeaderSyncPrevHash(hashTip, hashPrev))
-                hashTip = 0;
-            else
-                hashTip = hashPrev;
-        }
-
-        if (vHave.size() > 10)
-            nStep *= 2;
-    }
-
-    vHave.push_back(!fTestNet ? hashGenesisBlockOfficial : hashGenesisBlockTestNet);
-    return CBlockLocator(vHave);
-}
-
-static std::vector<uint256> GetHeaderSyncDownloadPath(uint256 hashTip)
-{
-    std::vector<uint256> vPath;
-
-    while (hashTip != 0 && !mapBlockIndex.count(hashTip))
-    {
-        auto mi = mapHeaderSync.find(hashTip);
-        if (mi == mapHeaderSync.end())
-            break;
-
-        vPath.push_back(hashTip);
-        hashTip = mi->second.header.hashPrevBlock;
-    }
-
-    std::reverse(vPath.begin(), vPath.end());
-    return vPath;
-}
-
-static unsigned int CountHeaderSyncInFlight()
-{
-    const int64_t nNow = GetTime() * 1000000;
-    unsigned int nInFlight = 0;
-    for (const auto& [hash, node] : mapHeaderSync)
-    {
-        if (node.fRequested && nNow - node.nLastRequestTime < HEADER_REQUEST_TIMEOUT_MICROS)
-            ++nInFlight;
-    }
-    return nInFlight;
-}
-
-static unsigned int GetHeaderSyncPlannerDepth()
-{
-    if (hashBestHeaderSync == 0)
-        return 0;
-
-    return (unsigned int)GetHeaderSyncDownloadPath(hashBestHeaderSync).size();
-}
-
-static int GetHeaderSyncPlannerHeight()
-{
-    if (hashBestHeaderSync == 0)
-        return pindexBest ? pindexBest->nHeight : -1;
-
-    auto mi = mapHeaderSync.find(hashBestHeaderSync);
-    if (mi == mapHeaderSync.end())
-        return pindexBest ? pindexBest->nHeight : -1;
-
-    return mi->second.nHeight;
-}
-
-static unsigned int QueueHeaderSyncBlocks(CNode* pfrom, unsigned int nWindow)
-{
-    if (!pfrom || hashBestHeaderSync == 0)
-        return 0;
-
-    const std::vector<uint256> vPath = GetHeaderSyncDownloadPath(hashBestHeaderSync);
-    if (vPath.empty())
-        return 0;
-
-    const int64_t nNow = GetTime() * 1000000;
-    unsigned int nInFlight = CountHeaderSyncInFlight();
-    unsigned int nQueued = 0;
-
-    for (const auto& hash : vPath)
-    {
-        if (nInFlight + nQueued >= nWindow)
-            break;
-
-        auto mi = mapHeaderSync.find(hash);
-        if (mi == mapHeaderSync.end())
-            continue;
-
-        if (mi->second.fRequested && nNow - mi->second.nLastRequestTime < HEADER_REQUEST_TIMEOUT_MICROS)
-            continue;
-
-        pfrom->AskFor(CInv(MSG_BLOCK, hash));
-        mi->second.fRequested = true;
-        mi->second.nLastRequestTime = nNow;
-        ++nQueued;
-    }
-
-    return nQueued;
-}
-
-// Returns the first request time (microseconds) for a block in the header sync cache, or 0
-static int64_t GetHeaderSyncRequestTime(const uint256& hashBlock)
-{
-    auto mi = mapHeaderSync.find(hashBlock);
-    if (mi == mapHeaderSync.end())
-        return 0;
-    return mi->second.nFirstRequestTime;
-}
-
-static void MarkHeaderSyncBlockAccepted(const uint256& hashBlock)
-{
-    auto mi = mapHeaderSync.find(hashBlock);
-    if (mi == mapHeaderSync.end())
-        return;
-
-    mapHeaderSync.erase(mi);
-    if (hashBestHeaderSync == hashBlock)
-        RecomputeBestHeaderSync();
-}
-
-static void ContinueHeaderSync(CNode* pfrom, const uint256& hashTip)
-{
-    if (!pfrom || hashTip == 0)
-        return;
-
-    CBlockLocator locator = BuildHeaderSyncLocator(hashTip);
-    if (locator.IsNull())
-        return;
-
-    pfrom->PushMessage("getheaders", locator, uint256(0));
-}
-
-static bool RequestHeaderSyncRefill(CNode* pfrom, uint256 hashTip, int64_t nMinIntervalSeconds, const char* pszReason)
-{
-    if (!pfrom || pfrom->fClient || pfrom->nVersion == 0 || !IsInitialBlockDownload())
-        return false;
-
-    const int64_t nNowSec = GetTime();
-    if (nMinIntervalSeconds > 0 &&
-        nNowSec - pfrom->nLastIbdHeaderRequest < nMinIntervalSeconds)
-        return false;
-
-    uint256 hashLocatorTip = hashTip;
-    if (hashLocatorTip == 0 ||
-        (!mapBlockIndex.count(hashLocatorTip) && !mapHeaderSync.count(hashLocatorTip)))
-    {
-        hashLocatorTip = hashBestHeaderSync;
-    }
-
-    if (hashLocatorTip != 0 && (!pindexBest || hashLocatorTip != pindexBest->GetBlockHash()))
-    {
-        ContinueHeaderSync(pfrom, hashLocatorTip);
-    }
-    else
-    {
-        if (!pindexBest)
-            return false;
-
-        pfrom->pindexLastGetHeadersBegin = nullptr;
-        pfrom->PushGetHeaders(pindexBest, uint256(0));
-        hashLocatorTip = pindexBest->GetBlockHash();
-    }
-
-    pfrom->nLastIbdHeaderRequest = nNowSec;
-    printf("IBD-DIAG: %s getheaders to peer=%s locator=%s plannerDepth=%u inflight=%u\n",
-        pszReason, pfrom->addr.ToString().c_str(),
-        hashLocatorTip.ToString().substr(0,20).c_str(),
-        GetHeaderSyncPlannerDepth(), CountHeaderSyncInFlight());
-    return true;
-}
-
-static unsigned int RequestHeaderSyncRefillAllPeers(uint256 hashTip, int64_t nMinIntervalSeconds, const char* pszReason)
-{
-    std::vector<CNode*> vEligiblePeers;
-    {
-        LOCK(cs_vNodes);
-        for (CNode* pnode : vNodes)
-        {
-            if (!pnode->fClient && pnode->nVersion != 0 && !pnode->fDisconnect)
-                vEligiblePeers.push_back(pnode);
-        }
-    }
-
-    unsigned int nRequested = 0;
-    for (CNode* pnode : vEligiblePeers)
-    {
-        if (RequestHeaderSyncRefill(pnode, hashTip, nMinIntervalSeconds, pszReason))
-            ++nRequested;
-    }
-
-    return nRequested;
-}
-
-// Parallel block downloading: distribute blocks across all available peers
-static unsigned int QueueHeaderSyncBlocksParallel(unsigned int nWindow)
-{
-    if (hashBestHeaderSync == 0)
-        return 0;
-
-    const std::vector<uint256> vPath = GetHeaderSyncDownloadPath(hashBestHeaderSync);
-    if (vPath.empty())
-        return 0;
-
-    // Collect eligible peers
-    std::vector<CNode*> vEligiblePeers;
-    {
-        LOCK(cs_vNodes);
-        for (CNode* pnode : vNodes)
-        {
-            if (!pnode->fClient && pnode->nVersion != 0 && !pnode->fDisconnect)
-                vEligiblePeers.push_back(pnode);
-        }
-    }
-
-    if (vEligiblePeers.empty())
-        return 0;
-
-    const int64_t nNow = GetTime() * 1000000;
-    unsigned int nInFlight = CountHeaderSyncInFlight();
-    unsigned int nQueued = 0;
-    unsigned int nPeerIndex = 0;
-
-    // Sort peers by blocks delivered (descending) for speed-weighted assignment.
-    // Faster peers get more blocks assigned to them, improving IBD throughput
-    // on Tor networks where latency varies significantly between peers.
-    std::sort(vEligiblePeers.begin(), vEligiblePeers.end(),
-        [](const CNode* a, const CNode* b) {
-            return a->nBlocksDelivered > b->nBlocksDelivered;
-        });
-
-    // Build a weighted distribution: top peer gets 3 slots per round, second gets 2, rest get 1.
-    std::vector<CNode*> vWeightedPeers;
-    for (size_t i = 0; i < vEligiblePeers.size(); i++)
-    {
-        int nWeight = (i == 0) ? 3 : (i == 1) ? 2 : 1;
-        for (int w = 0; w < nWeight; w++)
-            vWeightedPeers.push_back(vEligiblePeers[i]);
-    }
-
-    // Adaptive timeout: use average peer latency to set timeouts.
-    // If peers average 2s, timeout at 10s. If peers average 15s, timeout at 45s.
-    // Clamp between 10s and 60s. Default to 60s when no latency data.
-    int64_t nAdaptiveTimeout = HEADER_REQUEST_TIMEOUT_MICROS;
-    {
-        int64_t nTotalLatency = 0;
-        int nPeersWithLatency = 0;
-        for (const CNode* pnode : vEligiblePeers) {
-            if (pnode->nAvgBlockLatencyUs > 0) {
-                nTotalLatency += pnode->nAvgBlockLatencyUs;
-                ++nPeersWithLatency;
-            }
-        }
-        if (nPeersWithLatency > 0) {
-            int64_t nAvgLatency = nTotalLatency / nPeersWithLatency;
-            nAdaptiveTimeout = std::max((int64_t)(10 * 1000000),
-                               std::min((int64_t)(60 * 1000000), nAvgLatency * 5));
-        }
-    }
-
-    // Distribute blocks across peers using speed-weighted assignment
-    for (const auto& hash : vPath)
-    {
-        if (nInFlight + nQueued >= nWindow)
-            break;
-
-        auto mi = mapHeaderSync.find(hash);
-        if (mi == mapHeaderSync.end())
-            continue;
-
-        bool fNeedsRequest = false;
-        if (!mi->second.fRequested)
-        {
-            fNeedsRequest = true;
-        }
-        else if (nNow - mi->second.nLastRequestTime >= nAdaptiveTimeout)
-        {
-            fNeedsRequest = true;
-        }
-        else if (nNow - mi->second.nLastRequestTime >= HEADER_REDUNDANT_REQUEST_MICROS)
-        {
-            fNeedsRequest = true;
-        }
-
-        if (!fNeedsRequest)
-            continue;
-
-        CNode* pnode = vWeightedPeers[nPeerIndex % vWeightedPeers.size()];
-        pnode->AskFor(CInv(MSG_BLOCK, hash));
-
-        if (IsInitialBlockDownload() &&
-            vWeightedPeers.size() >= 2 &&
-            vWeightedPeers.size() < HEADER_REDUNDANT_PEER_THRESHOLD &&
-            !mi->second.fRequested)
-        {
-            CNode* pnode2 = vWeightedPeers[(nPeerIndex + 1) % vWeightedPeers.size()];
-            if (pnode2 != pnode)
-                pnode2->AskFor(CInv(MSG_BLOCK, hash));
-        }
-
-        if (!mi->second.fRequested || nNow - mi->second.nLastRequestTime >= HEADER_REQUEST_TIMEOUT_MICROS)
-        {
-            if (!mi->second.fRequested)
-                mi->second.nFirstRequestTime = nNow;
-            mi->second.fRequested = true;
-            mi->second.nLastRequestTime = nNow;
-        }
-
-        ++nQueued;
-        ++nPeerIndex;
-    }
-
-    if (nQueued > 0)
-        printf("IBD-DIAG: parallel queue distributed %u blocks across %zu peers (window=%u, inflight=%u)\n",
-            nQueued, vEligiblePeers.size(), nWindow, nInFlight);
-
-    return nQueued;
-}
-
 } // namespace
 
 //////////////////////////////////////////////////////////////////////////////
@@ -1843,10 +1324,12 @@ bool IsInitialBlockDownload()
         pindexLastBest = pindexBest;
         nLastUpdate = GetTime();
     }
-    // IBD is complete once we've passed the checkpoint height estimate.
-    // The previous >24h block-time check incorrectly kept IBD true when the
-    // chain was synced but simply stalled (no new blocks arriving), which
-    // prevented the stake miner from ever proceeding.
+    // IBD is complete once we've passed the checkpoint AND the chain tip is
+    // recent (within 24h). This prevents a stall AFTER checkpoint from
+    // permanently disabling header fetching. The forcestaking path above
+    // handles the specific staking-broker scenario.
+    if (GetTime() - nLastUpdate > 24 * 60 * 60)
+        return true;
     return false;
 }
 
@@ -3339,7 +2822,12 @@ bool CBlock::CheckBlock(bool fCheckPOW, bool fCheckMerkleRoot, bool fCheckSig) c
             return DoS(100, error("CheckBlock() : more than one coinbase"));
 
     // Check coinbase timestamp
-    if (GetBlockTime() > FutureDrift((int64_t)vtx[0].nTime))
+    // NOTE: Must use the pre-fork (10-minute) drift tolerance here because
+    // CheckBlock() is context-free (no nHeight) and can be called on blocks
+    // at any height, including during chain reorgs from old fork chains.
+    // The tight 90-second drift for post-fork blocks is enforced separately
+    // in AcceptBlock/ConnectBlock with proper height context.
+    if (GetBlockTime() > (int64_t)vtx[0].nTime + 10 * 60)
         return DoS(50, error("CheckBlock() : coinbase timestamp is too early"));
 
     if (IsProofOfStake())
@@ -3583,7 +3071,7 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
     // triangles: check proof-of-stake
     // Limited duplicity on stake: prevents block flood attack
     // Duplicate stake allowed only when there is orphan child block
-    if (pblock->IsProofOfStake() && setStakeSeen.count(pblock->GetProofOfStake()) && !mapOrphanBlocksByPrev.count(hash))
+    if (pblock->IsProofOfStake() && !GetBoolArg("-ignoredupstake", false) && setStakeSeen.count(pblock->GetProofOfStake()) && !mapOrphanBlocksByPrev.count(hash))
         return error("ProcessBlock() : duplicate proof-of-stake (%s, %d) for block %s", pblock->GetProofOfStake().first.ToString().c_str(), pblock->GetProofOfStake().second, hash.ToString().c_str());
 
     // Preliminary checks
@@ -3641,13 +3129,15 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
         {
             // Limited duplicity on stake: prevents block flood attack
             // Duplicate stake allowed only when there is orphan child block
-            if (setStakeSeenOrphan.count(pblock2->GetProofOfStake()) && !mapOrphanBlocksByPrev.count(hash))
+            if (!GetBoolArg("-ignoredupstake", false) && setStakeSeenOrphan.count(pblock2->GetProofOfStake()) && !mapOrphanBlocksByPrev.count(hash))
                 return error("ProcessBlock() : duplicate proof-of-stake (%s, %d) for orphan block %s", pblock2->GetProofOfStake().first.ToString().c_str(), pblock2->GetProofOfStake().second, hash.ToString().c_str());
             else
                 setStakeSeenOrphan.insert(pblock2->GetProofOfStake());
         }
+        uint256 hashPrevOrphan = pblock2->hashPrevBlock;
+        CBlock* pblock2raw = pblock2.get();
         mapOrphanBlocks.insert(make_pair(hash, std::move(pblock2)));
-        mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2.get()));
+        mapOrphanBlocksByPrev.insert(make_pair(hashPrevOrphan, pblock2raw));
         dequeOrphanOrder.push_back(hash);  // track insertion order for FIFO eviction
 
         // Limit orphan blocks to prevent memory exhaustion.
@@ -3659,11 +3149,11 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
         // Ask this guy to fill in what we're missing
         if (pfrom && pindexBest)
         {
-            pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2.get()));
+            pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2raw));
             // triangles: getblocks may not obtain the ancestor block rejected
             // earlier by duplicate-stake check so we ask for it again directly
             if (!IsInitialBlockDownload())
-                pfrom->AskFor(CInv(MSG_BLOCK, WantedByOrphan(pblock2.get())));
+                pfrom->AskFor(CInv(MSG_BLOCK, WantedByOrphan(pblock2raw)));
         }
         return true;
     }
@@ -3672,7 +3162,7 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
     if (!pblock->AcceptBlock())
         return error("ProcessBlock() : AcceptBlock FAILED");
 
-    MarkHeaderSyncBlockAccepted(hash);
+    g_syncManager.BlockAccepted(hash);
 
     // Recursively process any orphan blocks that depended on this one
     vector<uint256> vWorkQueue;
@@ -3688,7 +3178,7 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
             if (pblockOrphan->AcceptBlock())
             {
                 vWorkQueue.push_back(pblockOrphan->GetHash());
-                MarkHeaderSyncBlockAccepted(pblockOrphan->GetHash());
+                g_syncManager.BlockAccepted(pblockOrphan->GetHash());
             }
             mapOrphanBlocks.erase(pblockOrphan->GetHash());
             setStakeSeenOrphan.erase(pblockOrphan->GetProofOfStake());
@@ -3702,16 +3192,16 @@ bool ProcessBlock(CNode* pfrom, CBlock* pblock)
     if (IsInitialBlockDownload())
     {
         const unsigned int nQueued =
-            (hashBestHeaderSync != 0) ? QueueHeaderSyncBlocksParallel(HEADER_DOWNLOAD_WINDOW) : 0;
+            (g_syncManager.GetBestHeader() != 0) ? g_syncManager.QueueBlocksParallel() : 0;
         if (nQueued > 0)
             printf("IBD-DIAG: queued %u more blocks from header planner after accepting %s\n",
                 nQueued, hash.ToString().substr(0,20).c_str());
 
-        const unsigned int nPlannerDepth = GetHeaderSyncPlannerDepth();
-        if (nPlannerDepth <= HEADER_SYNC_LOW_WATER)
+        const unsigned int nPlannerDepth = g_syncManager.GetPlannerDepth();
+        if (nPlannerDepth <= CSyncManager::HEADER_SYNC_LOW_WATER)
         {
-            const unsigned int nRefilled = RequestHeaderSyncRefillAllPeers(
-                hashBestHeaderSync, HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS,
+            const unsigned int nRefilled = g_syncManager.RequestRefillAllPeers(
+                g_syncManager.GetBestHeader(), CSyncManager::HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS,
                 (nPlannerDepth == 0) ? "post-accept planner empty" : "post-accept planner low-water");
             if (nRefilled > 0)
                 printf("IBD-DIAG: post-accept requested headers from %u peers at plannerDepth=%u after block %s\n",
@@ -4562,14 +4052,23 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         // parallelism. Multiple peers sending overlapping inv ranges is harmless
         // (AlreadyHave filters duplicates) but ensures we discover and download
         // blocks from the fastest available source.
+        // NOTE: nStartingHeight from version messages is unverified. Peers can
+        // claim any height. During IBD we always ask all eligible peers rather
+        // than filtering on a claim that may be wrong (a stunted node could be
+        // reporting the full chain height while only serving the tail of its
+        // own fork). Use nBestKnownHeight (updated from actual block responses)
+        // for peer capability assessment instead.
         static int nAskedForBlocks = 0;
         bool fIBD = IsInitialBlockDownload();
-        bool fBehindPeer = (pfrom->nStartingHeight > nBestHeight);
+        // During IBD: ask every non-client peer unconditionally to maximise
+        // download sources. Post-IBD: use traditional height-check logic.
         bool fShouldAsk = !pfrom->fClient && !pfrom->fOneShot &&
-            (pfrom->nStartingHeight > (nBestHeight - 144)) &&
+            (fIBD ||
+             pfrom->nStartingHeight > (nBestHeight - 144) ||
+             pfrom->nStartingHeight > nBestHeight) &&
             (pfrom->nVersion < NOBLKS_VERSION_START ||
              pfrom->nVersion >= NOBLKS_VERSION_END) &&
-             (fIBD || nAskedForBlocks < 1 || vNodes.size() <= 1 || fBehindPeer);
+             (fIBD || nAskedForBlocks < 1 || vNodes.size() <= 1 || pfrom->nStartingHeight > nBestHeight);
         printf("IBD-DIAG: version handler: peer=%s height=%d ourHeight=%d fClient=%d fOneShot=%d shouldAsk=%d nAskedForBlocks=%d IBD=%d\n",
             pfrom->addr.ToString().c_str(), pfrom->nStartingHeight, nBestHeight,
             pfrom->fClient, pfrom->fOneShot, fShouldAsk, nAskedForBlocks, fIBD);
@@ -4582,7 +4081,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             // so we learn about future blocks much faster. The headers handler
             // will AskFor each unknown block, pre-populating the download queue.
             if (fIBD)
-                RequestHeaderSyncRefill(pfrom, hashBestHeaderSync, 0, "version bootstrap");
+                g_syncManager.RequestRefill(pfrom, g_syncManager.GetBestHeader(), 0, "version bootstrap");
             printf("IBD-DIAG: sent getblocks%s from height %d to peer %s\n",
                 fIBD ? "+getheaders" : "", nBestHeight, pfrom->addr.ToString().c_str());
         }
@@ -4880,19 +4379,25 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         // GetBlockIndex() fell through to genesis (no locator hash matched
         // our main chain). If the peer's tip isn't our genesis,
         // they're on a completely different fork.
+        //
+        // triangles fix: instead of banning or disconnecting, always respond
+        // with our main chain blocks so a fork node can learn the canonical
+        // chain and reorganize. The fork node's client will automatically
+        // reorg when it receives blocks that form a longer or higher-work chain.
         if (!locator.IsNull() && pindex == pindexGenesisBlock &&
             pindexGenesisBlock && locator.GetTipHash() != pindexGenesisBlock->GetBlockHash())
         {
             pfrom->nIncompatibleGetblocks++;
-            if (pfrom->nIncompatibleGetblocks >= 3)
-            {
-                printf("WARNING: peer %s sent %d getblocks with no common blocks — disconnecting (incompatible fork)\n",
-                    pfrom->addr.ToString().c_str(), pfrom->nIncompatibleGetblocks);
-                pfrom->Misbehaving(100);
-                return true;
-            }
-            printf("WARNING: peer %s getblocks locator has no common blocks (%d/3 before ban)\n",
+            // triangles: after many failed attempts, reset — the peer may now be
+            // on the correct chain and we don't want to ban a node that's just
+            // learning about the main chain from us.
+            if (pfrom->nIncompatibleGetblocks > 10)
+                pfrom->nIncompatibleGetblocks = 0;
+            // triangles: NO return/ban here — fall through and serve main chain
+            // blocks so the forking peer can reorg to our chain.
+            printf("WARNING: peer %s getblocks locator has no common blocks — serving main chain from genesis (counter=%d, will reset after 10)\\n",
                 pfrom->addr.ToString().c_str(), pfrom->nIncompatibleGetblocks);
+            pindex = pindexGenesisBlock;
         }
         else if (pindex && pindex != pindexGenesisBlock)
         {
@@ -4972,97 +4477,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
     {
         vector<CBlock> vHeaders;
         vRecv >> vHeaders;
-        if (vHeaders.size() > 2000)
-        {
-            pfrom->Misbehaving(20);
-            return error("message headers size() = %" PRIszu "", vHeaders.size());
-        }
-
-        uint256 hashChainTip = 0;
-        int nNewHeaders = 0;
-        for (const CBlock& header : vHeaders)
-        {
-            if (!header.vtx.empty())
-            {
-                pfrom->Misbehaving(20);
-                return error("headers message includes transactions");
-            }
-
-            const uint256 hashHeader = header.GetHash();
-            if (mapBlockIndex.count(hashHeader) || mapHeaderSync.count(hashHeader))
-            {
-                hashChainTip = hashHeader;
-                continue;
-            }
-
-            if (hashChainTip != 0)
-            {
-                if (header.hashPrevBlock != hashChainTip)
-                {
-                    pfrom->Misbehaving(20);
-                    return error("non-continuous headers sequence");
-                }
-            }
-            else
-            {
-                auto miPrev = mapBlockIndex.find(header.hashPrevBlock);
-                if (miPrev == mapBlockIndex.end() && !mapHeaderSync.count(header.hashPrevBlock))
-                    break;
-            }
-
-            if (!AddHeaderSyncNode(header, hashHeader))
-            {
-                pfrom->Misbehaving(20);
-                return error("invalid header sequence");
-            }
-
-            hashChainTip = hashHeader;
-            nNewHeaders++;
-        }
-
-        int nRequested = 0;
-        if (hashBestHeaderSync != 0)
-            nRequested = QueueHeaderSyncBlocksParallel(HEADER_DOWNLOAD_WINDOW);
-
-        if (nNewHeaders > 0)
-            nLastNewHeaderTime = GetTime();
-
-        if (nNewHeaders > 0 || nRequested > 0)
-            printf("IBD-DIAG: accepted %d new headers, queued %d blocks from %zu headers (peer=%s bestHeader=%s)\n",
-                nNewHeaders, nRequested, vHeaders.size(), pfrom->addr.ToString().c_str(),
-                hashBestHeaderSync.ToString().substr(0,20).c_str());
-
-        // If we received a full batch, continue fetching headers.
-        // During IBD, prefer getheaders over getblocks since headers are ~80 bytes
-        // vs full blocks, letting us discover the chain structure faster.
-        if (vHeaders.size() >= 2000)
-        {
-            if (IsInitialBlockDownload() && hashChainTip != 0)
-                ContinueHeaderSync(pfrom, hashChainTip);
-            else
-                pfrom->PushGetBlocks(pindexBest, uint256(0));
-        }
-        else if (IsInitialBlockDownload() && nNewHeaders > 0 && hashChainTip != 0)
-        {
-            // Partial batch with new content. The peer either truncated its
-            // response (e.g. send-buffer pressure on Tor) or is briefly at the
-            // tip of what it knows. Either way the v5.9.2 fix only refilled
-            // when the cache fully drained, so a partial batch could leave the
-            // pipeline silently parked. Ask this peer to continue from the
-            // highest header we now know — covers truncated responses, and
-            // costs at most one empty headers reply when the peer is honestly
-            // at the chain tip.
-            ContinueHeaderSync(pfrom, hashChainTip);
-        }
-        else if (IsInitialBlockDownload())
-        {
-            const unsigned int nPlannerDepth = GetHeaderSyncPlannerDepth();
-            if (nPlannerDepth <= HEADER_SYNC_LOW_WATER)
-                RequestHeaderSyncRefill(
-                    pfrom, (hashChainTip != 0) ? hashChainTip : hashBestHeaderSync,
-                    HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS,
-                    (nPlannerDepth == 0) ? "headers planner empty" : "headers planner low-water");
-        }
+        if (!g_syncManager.ProcessHeaders(pfrom, vHeaders))
+            return false;
     }
 
 
@@ -5154,24 +4570,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         CInv inv(MSG_BLOCK, hashBlock);
         pfrom->AddInventoryKnown(inv);
 
-        // Track block delivery and measure latency for adaptive timeouts
-        pfrom->nBlocksDelivered++;
-        if (nBestHeight > pfrom->nBestKnownHeight)
-            pfrom->nBestKnownHeight = nBestHeight;
-
-        // Update rolling average latency (exponential moving average, 7/8 old + 1/8 new)
-        {
-            int64_t nRequestTime = GetHeaderSyncRequestTime(hashBlock);
-            if (nRequestTime > 0) {
-                int64_t nLatency = GetTime() * 1000000 - nRequestTime;
-                if (nLatency > 0) {
-                    if (pfrom->nAvgBlockLatencyUs == 0)
-                        pfrom->nAvgBlockLatencyUs = nLatency;
-                    else
-                        pfrom->nAvgBlockLatencyUs = (pfrom->nAvgBlockLatencyUs * 7 + nLatency) / 8;
-                }
-            }
-        }
+        g_syncManager.TrackBlockDelivery(pfrom, hashBlock);
 
         if (ProcessBlock(pfrom, &block))
         {
@@ -5180,7 +4579,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
             if (IsInitialBlockDownload())
             {
                 // Keep download window full after every accepted block
-                QueueHeaderSyncBlocksParallel(HEADER_DOWNLOAD_WINDOW);
+                g_syncManager.QueueBlocksParallel();
 
                 static int nBlocksSinceRequest = 0;
                 if (++nBlocksSinceRequest >= 500)
@@ -5982,18 +5381,18 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
                 {
                     pto->pindexLastGetHeadersBegin = nullptr;
 
-                    uint256 hashLocatorTip = hashBestHeaderSync;
+                    uint256 hashLocatorTip = g_syncManager.GetBestHeader();
                     if (hashLocatorTip == 0 && nHighestInvWalk > nBestHeight &&
                         hashHighestInvWalk != 0 && mapBlockIndex.count(hashHighestInvWalk))
                     {
                         hashLocatorTip = hashHighestInvWalk;
                     }
 
-                    unsigned int nRefilled = RequestHeaderSyncRefillAllPeers(
+                    unsigned int nRefilled = g_syncManager.RequestRefillAllPeers(
                         hashLocatorTip,
                         0,
                         "stall-recovery");
-                    unsigned int nQueued = QueueHeaderSyncBlocksParallel(HEADER_DOWNLOAD_WINDOW);
+                    unsigned int nQueued = g_syncManager.QueueBlocksParallel();
 
                     printf("SYNC-DIAG: stall recovery used headers-first path (locator=%s, refillPeers=%u, queued=%u)\n",
                         hashLocatorTip.ToString().substr(0,20).c_str(),
@@ -6024,84 +5423,9 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
             }
         }
 
-        // Per-peer IBD getheaders heartbeat. The v5.9.2 belt-and-suspenders
-        // had three holes that this replaces:
-        //   1. It only fired when hashBestHeaderSync == 0 (cache fully empty);
-        //      a few stale in-flight entries blocked refill until 15-min TTL.
-        //   2. The throttle was process-wide, so an unresponsive peer could
-        //      "absorb" the one-per-30s request and leave others unkicked.
-        //   3. It had no path for "peer stopped feeding mid-batch" — only
-        //      total-cache-drain triggered it.
-        //
-        // Per-peer heartbeat with an adaptive interval covers all three:
-        //   - Low-water mode (cache below the download window): 15s, refills
-        //     before the planner runs dry without waiting for cache exhaustion.
-        //   - Steady mode (cache filled): 60s, keeps each peer's view of our
-        //     locator fresh so a peer that goes silent gets re-asked, and a
-        //     peer that catches up between calls can announce new headers.
-        // An empty headers response is ~14 bytes — cheap on Tor, no abuse risk.
-        if (!pto->fClient && pto->nVersion != 0 && IsInitialBlockDownload())
-        {
-            const int64_t nNowSec = GetTime();
-            const unsigned int nPlannerDepth = GetHeaderSyncPlannerDepth();
-            const unsigned int nInFlight = CountHeaderSyncInFlight();
-            static int64_t nLastHeaderPlannerControl = 0;
-            static int64_t nLastHeaderWatchdog = 0;
-            static int64_t nLastBlockPlannerControl = 0;
-
-            if (nLastNewHeaderTime == 0)
-                nLastNewHeaderTime = nNowSec;
-
-            if (nNowSec - nLastHeaderPlannerControl >= HEADER_SYNC_CONTROL_INTERVAL_SECONDS &&
-                nPlannerDepth < HEADER_SYNC_LOW_WATER &&
-                nInFlight < HEADER_SYNC_TARGET_INFLIGHT)
-            {
-                const unsigned int nRefilled = RequestHeaderSyncRefillAllPeers(
-                    hashBestHeaderSync, HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS,
-                    "control-loop");
-                if (nRefilled > 0)
-                    printf("IBD-DIAG: control-loop refill from %u peers (plannerDepth=%u inflight=%u target=%u)\n",
-                        nRefilled, nPlannerDepth, nInFlight, HEADER_SYNC_TARGET_INFLIGHT);
-                nLastHeaderPlannerControl = nNowSec;
-            }
-
-            if (nNowSec - nLastHeaderWatchdog >= HEADER_SYNC_CONTROL_INTERVAL_SECONDS &&
-                nNowSec - nLastNewHeaderTime >= HEADER_SYNC_WATCHDOG_SECONDS)
-            {
-                const unsigned int nRefilled = RequestHeaderSyncRefillAllPeers(
-                    hashBestHeaderSync, HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS,
-                    "headers-watchdog");
-                if (nRefilled > 0)
-                    printf("IBD-DIAG: headers watchdog refill from %u peers after %llds without new headers (plannerDepth=%u inflight=%u)\n",
-                        nRefilled,
-                        (long long)(nNowSec - nLastNewHeaderTime),
-                        nPlannerDepth,
-                        nInFlight);
-                nLastHeaderWatchdog = nNowSec;
-            }
-
-            const int64_t nMinInterval =
-                (mapHeaderSync.size() < HEADER_DOWNLOAD_WINDOW) ? 15 : 60;
-
-            if (nNowSec - pto->nLastIbdHeaderRequest >= nMinInterval)
-                RequestHeaderSyncRefill(pto, hashBestHeaderSync, nMinInterval, "heartbeat");
-
-            // Keep the block planner alive even when no new headers arrive and
-            // no blocks are being accepted. Without this periodic kick, the
-            // redundant-request and timeout logic inside QueueHeaderSyncBlocksParallel()
-            // only runs on header arrivals or block acceptance, so IBD can park
-            // indefinitely behind one missing frontier block.
-            if (nNowSec - nLastBlockPlannerControl >= HEADER_SYNC_CONTROL_INTERVAL_SECONDS &&
-                hashBestHeaderSync != 0 &&
-                nPlannerDepth > 0)
-            {
-                const unsigned int nRequeued = QueueHeaderSyncBlocksParallel(HEADER_DOWNLOAD_WINDOW);
-                if (nRequeued > 0)
-                    printf("IBD-DIAG: block-planner control queued %u block requests (plannerDepth=%u inflight=%u)\n",
-                        nRequeued, nPlannerDepth, nInFlight);
-                nLastBlockPlannerControl = nNowSec;
-            }
-        }
+        // Per-peer IBD getheaders heartbeat and block-planner cadence.
+        // Logic lives in CSyncManager::Tick — see syncmanager.cpp.
+        g_syncManager.Tick(pto, nHighestInvWalk, hashHighestInvWalk);
 
         //
         // Message: getdata
@@ -6112,9 +5436,9 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
             if (GetTime() - nLastStatus >= 15) {
                 printf("IBD-DIAG: STATUS height=%d plannerHeight=%d plannerDepth=%u inflight=%u peers=%d askfor_queued=%d orphans=%d\n",
                     nBestHeight,
-                    GetHeaderSyncPlannerHeight(),
-                    GetHeaderSyncPlannerDepth(),
-                    CountHeaderSyncInFlight(),
+                    g_syncManager.GetPlannerHeight(),
+                    g_syncManager.GetPlannerDepth(),
+                    g_syncManager.CountInFlight(),
                     (int)vNodes.size(),
                     (int)pto->mapAskFor.size(),
                     (int)mapOrphanBlocks.size());

src/qt/coincontroldialog.cpp

@@ -545,7 +545,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
         int64_t nFee = nTransactionFee * (1 + (int64_t)nBytes / 1000);
         
         // Min Fee
-        int64_t nMinFee = txDummy.GetMinFee(1, GMF_SEND, nBytes);
+        int64_t nMinFee = txDummy.GetMinFee(1, GetMinFeeMode::Send, nBytes);
         
         nPayFee = max(nFee, nMinFee);
         

src/syncmanager.cpp

@@ -0,0 +1,664 @@
+// Copyright (c) 2026 The Triangles developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "syncmanager.h"
+
+#include "bignum.h"
+#include "checkpoints.h"
+#include "main.h"
+#include "net.h"
+#include "util.h"
+
+#include <algorithm>
+#include <map>
+
+struct CSyncManager::HeaderNode
+{
+    CBlock header;
+    int nHeight;
+    uint256 nChainTrust;
+    bool fRequested;
+    int64_t nLastRequestTime;
+    int64_t nFirstRequestTime;
+    int64_t nInsertTime;
+};
+
+namespace
+{
+static const unsigned int MAX_HEADER_SYNC_CACHE = 15000;
+static const size_t HEADER_REDUNDANT_PEER_THRESHOLD = 4;
+static const int64_t HEADER_REQUEST_TIMEOUT_MICROS = 60 * 1000000;
+static const int64_t HEADER_REDUNDANT_REQUEST_MICROS = 5 * 1000000;
+static const int64_t HEADER_SYNC_TTL_MICROS = 15 * 60 * 1000000;
+
+std::map<uint256, CSyncManager::HeaderNode> mapHeaders;
+uint256 hashBestHeader = 0;
+int64_t nLastNewHeaderTime = 0;
+}
+
+CSyncManager g_syncManager;
+
+bool CSyncManager::HaveHeader(const uint256& hash) const
+{
+    return mapHeaders.count(hash) != 0;
+}
+
+uint256 CSyncManager::GetBestHeader() const
+{
+    return hashBestHeader;
+}
+
+std::size_t CSyncManager::GetHeaderCount() const
+{
+    return mapHeaders.size();
+}
+
+uint256 CSyncManager::GetHeaderTrust(unsigned int nBits) const
+{
+    CBigNum bnTarget;
+    bnTarget.SetCompact(nBits);
+
+    if (bnTarget <= 0)
+        return 0;
+
+    return ((CBigNum(1) << 256) / (bnTarget + 1)).getuint256();
+}
+
+bool CSyncManager::GetKnownHeaderState(const uint256& hash, int& nHeight, uint256& nChainTrust) const
+{
+    std::map<uint256, CBlockIndex*>::const_iterator miBlock = mapBlockIndex.find(hash);
+    if (miBlock != mapBlockIndex.end())
+    {
+        nHeight = miBlock->second->nHeight;
+        nChainTrust = miBlock->second->nChainTrust;
+        return true;
+    }
+
+    std::map<uint256, HeaderNode>::const_iterator miHeader = mapHeaders.find(hash);
+    if (miHeader != mapHeaders.end())
+    {
+        nHeight = miHeader->second.nHeight;
+        nChainTrust = miHeader->second.nChainTrust;
+        return true;
+    }
+
+    return false;
+}
+
+bool CSyncManager::GetPrevHash(const uint256& hash, uint256& hashPrev) const
+{
+    std::map<uint256, HeaderNode>::const_iterator miHeader = mapHeaders.find(hash);
+    if (miHeader != mapHeaders.end())
+    {
+        hashPrev = miHeader->second.header.hashPrevBlock;
+        return true;
+    }
+
+    std::map<uint256, CBlockIndex*>::const_iterator miBlock = mapBlockIndex.find(hash);
+    if (miBlock != mapBlockIndex.end() && miBlock->second->pprev)
+    {
+        hashPrev = miBlock->second->pprev->GetBlockHash();
+        return true;
+    }
+
+    return false;
+}
+
+void CSyncManager::RecomputeBestHeader()
+{
+    hashBestHeader = 0;
+    uint256 nBestTrust = 0;
+
+    for (std::map<uint256, HeaderNode>::const_iterator it = mapHeaders.begin(); it != mapHeaders.end(); ++it)
+    {
+        if (hashBestHeader == 0 || it->second.nChainTrust > nBestTrust)
+        {
+            hashBestHeader = it->first;
+            nBestTrust = it->second.nChainTrust;
+        }
+    }
+}
+
+void CSyncManager::PruneHeaders()
+{
+    const int64_t nNow = GetTime() * 1000000;
+
+    if (mapHeaders.size() > MAX_HEADER_SYNC_CACHE / 2)
+    {
+        unsigned int nEvicted = 0;
+        for (std::map<uint256, HeaderNode>::iterator it = mapHeaders.begin(); it != mapHeaders.end(); )
+        {
+            if (nNow - it->second.nInsertTime >= HEADER_SYNC_TTL_MICROS)
+            {
+                it = mapHeaders.erase(it);
+                ++nEvicted;
+            }
+            else
+                ++it;
+        }
+        if (nEvicted > 0)
+        {
+            printf("IBD-DIAG: TTL-evicted %u stale sync headers, %u remain\n",
+                nEvicted, (unsigned int)mapHeaders.size());
+            RecomputeBestHeader();
+        }
+    }
+
+    if (mapHeaders.size() > MAX_HEADER_SYNC_CACHE)
+    {
+        printf("IBD-DIAG: sync header cache exceeded %u entries, evicting oldest\n", MAX_HEADER_SYNC_CACHE);
+        while (mapHeaders.size() > MAX_HEADER_SYNC_CACHE * 3 / 4)
+        {
+            std::map<uint256, HeaderNode>::iterator oldest = mapHeaders.begin();
+            for (std::map<uint256, HeaderNode>::iterator it = mapHeaders.begin(); it != mapHeaders.end(); ++it)
+            {
+                if (it->second.nInsertTime < oldest->second.nInsertTime)
+                    oldest = it;
+            }
+            mapHeaders.erase(oldest);
+        }
+        RecomputeBestHeader();
+    }
+}
+
+bool CSyncManager::AddHeaderNode(const CBlock& header, const uint256& hashHeader)
+{
+    if (mapBlockIndex.count(hashHeader) || mapHeaders.count(hashHeader))
+        return true;
+
+    if (!header.vtx.empty())
+    {
+        printf("IBD-DIAG: header rejected (has vtx) hash=%s\n", hashHeader.ToString().substr(0,20).c_str());
+        return false;
+    }
+
+    if (header.GetBlockTime() > GetTime() + 15 * 60)
+    {
+        printf("IBD-DIAG: header rejected (future time) hash=%s time=%u\n",
+            hashHeader.ToString().substr(0,20).c_str(), header.nTime);
+        return false;
+    }
+
+    int nPrevHeight = -1;
+    uint256 nPrevChainTrust = 0;
+    if (!GetKnownHeaderState(header.hashPrevBlock, nPrevHeight, nPrevChainTrust))
+    {
+        printf("IBD-DIAG: header rejected (prev unknown) hash=%s prevHash=%s\n",
+            hashHeader.ToString().substr(0,20).c_str(),
+            header.hashPrevBlock.ToString().substr(0,20).c_str());
+        return false;
+    }
+
+    const int nHeight = nPrevHeight + 1;
+    if (nHeight <= CUTOFF_POW_BLOCK && !CheckProofOfWork(hashHeader, header.nBits))
+    {
+        printf("IBD-DIAG: header PoW FAILED at height %d hash=%s nBits=%08x prevHash=%s\n",
+            nHeight, hashHeader.ToString().substr(0,20).c_str(), header.nBits,
+            header.hashPrevBlock.ToString().substr(0,20).c_str());
+        return false;
+    }
+
+    HeaderNode node;
+    node.header = header;
+    node.nHeight = nHeight;
+    node.nChainTrust = nPrevChainTrust + GetHeaderTrust(header.nBits);
+    node.fRequested = false;
+    node.nLastRequestTime = 0;
+    node.nFirstRequestTime = 0;
+    node.nInsertTime = GetTime() * 1000000;
+
+    mapHeaders.insert({hashHeader, node});
+
+    if (hashBestHeader == 0 || node.nChainTrust > mapHeaders[hashBestHeader].nChainTrust)
+        hashBestHeader = hashHeader;
+
+    PruneHeaders();
+    return true;
+}
+
+std::vector<uint256> CSyncManager::GetDownloadPath(uint256 hashTip) const
+{
+    std::vector<uint256> vPath;
+
+    while (hashTip != 0 && !mapBlockIndex.count(hashTip))
+    {
+        std::map<uint256, HeaderNode>::const_iterator mi = mapHeaders.find(hashTip);
+        if (mi == mapHeaders.end())
+            break;
+
+        vPath.push_back(hashTip);
+        hashTip = mi->second.header.hashPrevBlock;
+    }
+
+    std::reverse(vPath.begin(), vPath.end());
+    return vPath;
+}
+
+unsigned int CSyncManager::CountInFlight() const
+{
+    const int64_t nNow = GetTime() * 1000000;
+    unsigned int nInFlight = 0;
+    for (std::map<uint256, HeaderNode>::const_iterator it = mapHeaders.begin(); it != mapHeaders.end(); ++it)
+    {
+        if (it->second.fRequested && nNow - it->second.nLastRequestTime < HEADER_REQUEST_TIMEOUT_MICROS)
+            ++nInFlight;
+    }
+    return nInFlight;
+}
+
+unsigned int CSyncManager::GetPlannerDepth() const
+{
+    if (hashBestHeader == 0)
+        return 0;
+
+    return (unsigned int)GetDownloadPath(hashBestHeader).size();
+}
+
+int CSyncManager::GetPlannerHeight() const
+{
+    if (hashBestHeader == 0)
+        return pindexBest ? pindexBest->nHeight : -1;
+
+    std::map<uint256, HeaderNode>::const_iterator mi = mapHeaders.find(hashBestHeader);
+    if (mi == mapHeaders.end())
+        return pindexBest ? pindexBest->nHeight : -1;
+
+    return mi->second.nHeight;
+}
+
+int64_t CSyncManager::GetRequestTime(const uint256& hashBlock) const
+{
+    std::map<uint256, HeaderNode>::const_iterator mi = mapHeaders.find(hashBlock);
+    if (mi == mapHeaders.end())
+        return 0;
+    return mi->second.nFirstRequestTime;
+}
+
+void CSyncManager::BlockAccepted(const uint256& hashBlock)
+{
+    std::map<uint256, HeaderNode>::iterator mi = mapHeaders.find(hashBlock);
+    if (mi == mapHeaders.end())
+        return;
+
+    mapHeaders.erase(mi);
+    if (hashBestHeader == hashBlock)
+        RecomputeBestHeader();
+}
+
+void CSyncManager::ContinueHeaders(CNode* pfrom, const uint256& hashTip)
+{
+    if (!pfrom || hashTip == 0)
+        return;
+
+    std::vector<uint256> vHave;
+    uint256 hashWalk = hashTip;
+    int nStep = 1;
+
+    while (hashWalk != 0)
+    {
+        vHave.push_back(hashWalk);
+
+        for (int i = 0; i < nStep && hashWalk != 0; ++i)
+        {
+            uint256 hashPrev = 0;
+            if (!GetPrevHash(hashWalk, hashPrev))
+                hashWalk = 0;
+            else
+                hashWalk = hashPrev;
+        }
+
+        if (vHave.size() > 10)
+            nStep *= 2;
+    }
+
+    vHave.push_back(!fTestNet ? hashGenesisBlockOfficial : hashGenesisBlockTestNet);
+    pfrom->PushMessage("getheaders", CBlockLocator(vHave), uint256(0));
+}
+
+bool CSyncManager::RequestRefill(CNode* pfrom, uint256 hashTip, int64_t nMinIntervalSeconds, const char* pszReason)
+{
+    if (!pfrom || pfrom->fClient || pfrom->nVersion == 0 || !IsInitialBlockDownload())
+        return false;
+
+    const int64_t nNowSec = GetTime();
+    if (nMinIntervalSeconds > 0 &&
+        nNowSec - pfrom->nLastIbdHeaderRequest < nMinIntervalSeconds)
+        return false;
+
+    uint256 hashLocatorTip = hashTip;
+    if (hashLocatorTip == 0 ||
+        (!mapBlockIndex.count(hashLocatorTip) && !mapHeaders.count(hashLocatorTip)))
+    {
+        hashLocatorTip = hashBestHeader;
+    }
+
+    if (hashLocatorTip != 0 && (!pindexBest || hashLocatorTip != pindexBest->GetBlockHash()))
+    {
+        ContinueHeaders(pfrom, hashLocatorTip);
+    }
+    else
+    {
+        if (!pindexBest)
+            return false;
+
+        pfrom->pindexLastGetHeadersBegin = NULL;
+        pfrom->PushGetHeaders(pindexBest, uint256(0));
+        hashLocatorTip = pindexBest->GetBlockHash();
+    }
+
+    pfrom->nLastIbdHeaderRequest = nNowSec;
+    printf("IBD-DIAG: %s getheaders to peer=%s locator=%s plannerDepth=%u inflight=%u\n",
+        pszReason, pfrom->addr.ToString().c_str(),
+        hashLocatorTip.ToString().substr(0,20).c_str(),
+        GetPlannerDepth(), CountInFlight());
+    return true;
+}
+
+unsigned int CSyncManager::RequestRefillAllPeers(uint256 hashTip, int64_t nMinIntervalSeconds, const char* pszReason)
+{
+    std::vector<CNode*> vEligiblePeers;
+    {
+        LOCK(cs_vNodes);
+        for (CNode* pnode : vNodes)
+        {
+            if (!pnode->fClient && pnode->nVersion != 0 && !pnode->fDisconnect)
+                vEligiblePeers.push_back(pnode);
+        }
+    }
+
+    unsigned int nRequested = 0;
+    for (CNode* pnode : vEligiblePeers)
+    {
+        if (RequestRefill(pnode, hashTip, nMinIntervalSeconds, pszReason))
+            ++nRequested;
+    }
+
+    return nRequested;
+}
+
+unsigned int CSyncManager::QueueBlocksParallel(unsigned int nWindow)
+{
+    if (hashBestHeader == 0)
+        return 0;
+
+    const std::vector<uint256> vPath = GetDownloadPath(hashBestHeader);
+    if (vPath.empty())
+        return 0;
+
+    std::vector<CNode*> vEligiblePeers;
+    {
+        LOCK(cs_vNodes);
+        for (CNode* pnode : vNodes)
+        {
+            if (!pnode->fClient && pnode->nVersion != 0 && !pnode->fDisconnect)
+                vEligiblePeers.push_back(pnode);
+        }
+    }
+
+    if (vEligiblePeers.empty())
+        return 0;
+
+    const int64_t nNow = GetTime() * 1000000;
+    unsigned int nInFlight = CountInFlight();
+    unsigned int nQueued = 0;
+    unsigned int nPeerIndex = 0;
+
+    std::sort(vEligiblePeers.begin(), vEligiblePeers.end(),
+        [](const CNode* a, const CNode* b) {
+            return a->nBlocksDelivered > b->nBlocksDelivered;
+        });
+
+    std::vector<CNode*> vWeightedPeers;
+    for (size_t i = 0; i < vEligiblePeers.size(); i++)
+    {
+        int nWeight = (i == 0) ? 3 : (i == 1) ? 2 : 1;
+        for (int w = 0; w < nWeight; w++)
+            vWeightedPeers.push_back(vEligiblePeers[i]);
+    }
+
+    int64_t nAdaptiveTimeout = HEADER_REQUEST_TIMEOUT_MICROS;
+    {
+        int64_t nTotalLatency = 0;
+        int nPeersWithLatency = 0;
+        for (const CNode* pnode : vEligiblePeers)
+        {
+            if (pnode->nAvgBlockLatencyUs > 0)
+            {
+                nTotalLatency += pnode->nAvgBlockLatencyUs;
+                ++nPeersWithLatency;
+            }
+        }
+        if (nPeersWithLatency > 0)
+        {
+            int64_t nAvgLatency = nTotalLatency / nPeersWithLatency;
+            nAdaptiveTimeout = std::max((int64_t)(10 * 1000000),
+                               std::min((int64_t)(60 * 1000000), nAvgLatency * 5));
+        }
+    }
+
+    for (std::vector<uint256>::const_iterator it = vPath.begin(); it != vPath.end(); ++it)
+    {
+        if (nInFlight + nQueued >= nWindow)
+            break;
+
+        std::map<uint256, HeaderNode>::iterator mi = mapHeaders.find(*it);
+        if (mi == mapHeaders.end())
+            continue;
+
+        bool fNeedsRequest = false;
+        if (!mi->second.fRequested)
+            fNeedsRequest = true;
+        else if (nNow - mi->second.nLastRequestTime >= nAdaptiveTimeout)
+            fNeedsRequest = true;
+        else if (nNow - mi->second.nLastRequestTime >= HEADER_REDUNDANT_REQUEST_MICROS)
+            fNeedsRequest = true;
+
+        if (!fNeedsRequest)
+            continue;
+
+        CNode* pnode = vWeightedPeers[nPeerIndex % vWeightedPeers.size()];
+        pnode->AskFor(CInv(MSG_BLOCK, *it));
+
+        if (IsInitialBlockDownload() &&
+            vWeightedPeers.size() >= 2 &&
+            vWeightedPeers.size() < HEADER_REDUNDANT_PEER_THRESHOLD &&
+            !mi->second.fRequested)
+        {
+            CNode* pnode2 = vWeightedPeers[(nPeerIndex + 1) % vWeightedPeers.size()];
+            if (pnode2 != pnode)
+                pnode2->AskFor(CInv(MSG_BLOCK, *it));
+        }
+
+        if (!mi->second.fRequested || nNow - mi->second.nLastRequestTime >= HEADER_REQUEST_TIMEOUT_MICROS)
+        {
+            if (!mi->second.fRequested)
+                mi->second.nFirstRequestTime = nNow;
+            mi->second.fRequested = true;
+            mi->second.nLastRequestTime = nNow;
+        }
+
+        ++nQueued;
+        ++nPeerIndex;
+    }
+
+    if (nQueued > 0)
+        printf("IBD-DIAG: sync manager queued %u blocks across %zu peers (window=%u, inflight=%u)\n",
+            nQueued, vEligiblePeers.size(), nWindow, nInFlight);
+
+    return nQueued;
+}
+
+bool CSyncManager::ProcessHeaders(CNode* pfrom, const std::vector<CBlock>& vHeaders)
+{
+    if (vHeaders.size() > 2000)
+    {
+        pfrom->Misbehaving(20);
+        return error("message headers size() = %" PRIszu "", vHeaders.size());
+    }
+
+    uint256 hashChainTip = 0;
+    int nNewHeaders = 0;
+    for (const CBlock& header : vHeaders)
+    {
+        if (!header.vtx.empty())
+        {
+            pfrom->Misbehaving(20);
+            return error("headers message includes transactions");
+        }
+
+        const uint256 hashHeader = header.GetHash();
+        if (mapBlockIndex.count(hashHeader) || mapHeaders.count(hashHeader))
+        {
+            hashChainTip = hashHeader;
+            continue;
+        }
+
+        if (hashChainTip != 0)
+        {
+            if (header.hashPrevBlock != hashChainTip)
+            {
+                pfrom->Misbehaving(20);
+                return error("non-continuous headers sequence");
+            }
+        }
+        else
+        {
+            std::map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(header.hashPrevBlock);
+            if (miPrev == mapBlockIndex.end() && !mapHeaders.count(header.hashPrevBlock))
+                break;
+        }
+
+        if (!AddHeaderNode(header, hashHeader))
+        {
+            pfrom->Misbehaving(20);
+            return error("invalid header sequence");
+        }
+
+        hashChainTip = hashHeader;
+        nNewHeaders++;
+    }
+
+    int nRequested = 0;
+    if (hashBestHeader != 0)
+        nRequested = QueueBlocksParallel(HEADER_DOWNLOAD_WINDOW);
+
+    if (nNewHeaders > 0)
+        nLastNewHeaderTime = GetTime();
+
+    if (nNewHeaders > 0 || nRequested > 0)
+        printf("IBD-DIAG: accepted %d new headers, queued %d blocks from %zu headers (peer=%s bestHeader=%s)\n",
+            nNewHeaders, nRequested, vHeaders.size(), pfrom->addr.ToString().c_str(),
+            hashBestHeader.ToString().substr(0,20).c_str());
+
+    if (vHeaders.size() >= 2000)
+    {
+        if (IsInitialBlockDownload() && hashChainTip != 0)
+            ContinueHeaders(pfrom, hashChainTip);
+        else
+            pfrom->PushGetBlocks(pindexBest, uint256(0));
+    }
+    else if (IsInitialBlockDownload() && nNewHeaders > 0 && hashChainTip != 0)
+    {
+        ContinueHeaders(pfrom, hashChainTip);
+    }
+    else if (IsInitialBlockDownload())
+    {
+        const unsigned int nPlannerDepth = GetPlannerDepth();
+        if (nPlannerDepth <= HEADER_SYNC_LOW_WATER)
+            RequestRefill(
+                pfrom, (hashChainTip != 0) ? hashChainTip : hashBestHeader,
+                HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS,
+                (nPlannerDepth == 0) ? "headers planner empty" : "headers planner low-water");
+    }
+
+    return true;
+}
+
+void CSyncManager::TrackBlockDelivery(CNode* pfrom, const uint256& hashBlock)
+{
+    if (!pfrom)
+        return;
+
+    pfrom->nBlocksDelivered++;
+    if (nBestHeight > pfrom->nBestKnownHeight)
+        pfrom->nBestKnownHeight = nBestHeight;
+
+    int64_t nRequestTime = GetRequestTime(hashBlock);
+    if (nRequestTime > 0)
+    {
+        int64_t nLatency = GetTime() * 1000000 - nRequestTime;
+        if (nLatency > 0)
+        {
+            if (pfrom->nAvgBlockLatencyUs == 0)
+                pfrom->nAvgBlockLatencyUs = nLatency;
+            else
+                pfrom->nAvgBlockLatencyUs = (pfrom->nAvgBlockLatencyUs * 7 + nLatency) / 8;
+        }
+    }
+}
+
+void CSyncManager::Tick(CNode* pto, int nHighestInvWalk, const uint256& hashHighestInvWalk)
+{
+    if (!pto || pto->fClient || pto->nVersion == 0 || !IsInitialBlockDownload())
+        return;
+
+    const int64_t nNowSec = GetTime();
+    const unsigned int nPlannerDepth = GetPlannerDepth();
+    const unsigned int nInFlight = CountInFlight();
+    static int64_t nLastHeaderPlannerControl = 0;
+    static int64_t nLastHeaderWatchdog = 0;
+    static int64_t nLastBlockPlannerControl = 0;
+
+    if (nLastNewHeaderTime == 0)
+        nLastNewHeaderTime = nNowSec;
+
+    if (nNowSec - nLastHeaderPlannerControl >= HEADER_SYNC_CONTROL_INTERVAL_SECONDS &&
+        nPlannerDepth < HEADER_SYNC_LOW_WATER &&
+        nInFlight < HEADER_SYNC_TARGET_INFLIGHT)
+    {
+        const unsigned int nRefilled = RequestRefillAllPeers(
+            hashBestHeader, HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS,
+            "control-loop");
+        if (nRefilled > 0)
+            printf("IBD-DIAG: control-loop refill from %u peers (plannerDepth=%u inflight=%u target=%u)\n",
+                nRefilled, nPlannerDepth, nInFlight, HEADER_SYNC_TARGET_INFLIGHT);
+        nLastHeaderPlannerControl = nNowSec;
+    }
+
+    if (nNowSec - nLastHeaderWatchdog >= HEADER_SYNC_CONTROL_INTERVAL_SECONDS &&
+        nNowSec - nLastNewHeaderTime >= HEADER_SYNC_WATCHDOG_SECONDS)
+    {
+        const unsigned int nRefilled = RequestRefillAllPeers(
+            hashBestHeader, HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS,
+            "headers-watchdog");
+        if (nRefilled > 0)
+            printf("IBD-DIAG: headers watchdog refill from %u peers after %llds without new headers (plannerDepth=%u inflight=%u)\n",
+                nRefilled,
+                (long long)(nNowSec - nLastNewHeaderTime),
+                nPlannerDepth,
+                nInFlight);
+        nLastHeaderWatchdog = nNowSec;
+    }
+
+    const int64_t nMinInterval = (mapHeaders.size() < HEADER_DOWNLOAD_WINDOW) ? 15 : 60;
+    if (nNowSec - pto->nLastIbdHeaderRequest >= nMinInterval)
+        RequestRefill(pto, hashBestHeader, nMinInterval, "heartbeat");
+
+    if (nNowSec - nLastBlockPlannerControl >= HEADER_SYNC_CONTROL_INTERVAL_SECONDS &&
+        hashBestHeader != 0 &&
+        nPlannerDepth > 0)
+    {
+        const unsigned int nRequeued = QueueBlocksParallel(HEADER_DOWNLOAD_WINDOW);
+        if (nRequeued > 0)
+            printf("IBD-DIAG: block-planner control queued %u block requests (plannerDepth=%u inflight=%u)\n",
+                nRequeued, nPlannerDepth, nInFlight);
+        nLastBlockPlannerControl = nNowSec;
+    }
+
+    if (hashBestHeader == 0 && nHighestInvWalk > nBestHeight &&
+        hashHighestInvWalk != 0 && mapBlockIndex.count(hashHighestInvWalk))
+    {
+        RequestRefill(pto, hashHighestInvWalk, HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS, "inv-walk bridge");
+    }
+}

src/syncmanager.h

@@ -0,0 +1,58 @@
+// Copyright (c) 2026 The Triangles developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#ifndef TRIANGLES_SYNCMANAGER_H
+#define TRIANGLES_SYNCMANAGER_H
+
+#include "uint256.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <vector>
+
+class CBlock;
+class CInv;
+class CNode;
+
+class CSyncManager
+{
+public:
+    struct HeaderNode;
+
+    static constexpr unsigned int HEADER_DOWNLOAD_WINDOW = 1024;
+    static constexpr unsigned int HEADER_SYNC_LOW_WATER = HEADER_DOWNLOAD_WINDOW / 4;
+    static constexpr unsigned int HEADER_SYNC_TARGET_INFLIGHT = HEADER_DOWNLOAD_WINDOW / 2;
+    static constexpr int64_t HEADER_SYNC_REFILL_MIN_INTERVAL_SECONDS = 5;
+    static constexpr int64_t HEADER_SYNC_CONTROL_INTERVAL_SECONDS = 5;
+    static constexpr int64_t HEADER_SYNC_WATCHDOG_SECONDS = 25;
+
+    bool HaveHeader(const uint256& hash) const;
+    uint256 GetBestHeader() const;
+    std::size_t GetHeaderCount() const;
+    unsigned int CountInFlight() const;
+    unsigned int GetPlannerDepth() const;
+    int GetPlannerHeight() const;
+    int64_t GetRequestTime(const uint256& hashBlock) const;
+
+    bool RequestRefill(CNode* pfrom, uint256 hashTip, int64_t nMinIntervalSeconds, const char* pszReason);
+    unsigned int RequestRefillAllPeers(uint256 hashTip, int64_t nMinIntervalSeconds, const char* pszReason);
+    unsigned int QueueBlocksParallel(unsigned int nWindow = HEADER_DOWNLOAD_WINDOW);
+    bool ProcessHeaders(CNode* pfrom, const std::vector<CBlock>& vHeaders);
+    void BlockAccepted(const uint256& hashBlock);
+    void TrackBlockDelivery(CNode* pfrom, const uint256& hashBlock);
+    void Tick(CNode* pto, int nHighestInvWalk, const uint256& hashHighestInvWalk);
+
+private:
+    uint256 GetHeaderTrust(unsigned int nBits) const;
+    bool GetKnownHeaderState(const uint256& hash, int& nHeight, uint256& nChainTrust) const;
+    bool GetPrevHash(const uint256& hash, uint256& hashPrev) const;
+    void RecomputeBestHeader();
+    void PruneHeaders();
+    bool AddHeaderNode(const CBlock& header, const uint256& hashHeader);
+    std::vector<uint256> GetDownloadPath(uint256 hashTip) const;
+    void ContinueHeaders(CNode* pfrom, const uint256& hashTip);
+};
+
+extern CSyncManager g_syncManager;
+
+#endif // TRIANGLES_SYNCMANAGER_H

src/tor/tor_process.cpp

@@ -259,10 +259,34 @@ bool CTorProcess::WriteTorrc()
     // SOCKS proxy for wallet connections
     torrc << "SocksPort " << socksPort << "\n";
 
-    // Data directory for Tor state
-    fs::path torStateDir = dataPath / "state";
-    fs::create_directories(torStateDir);
-    torrc << "DataDirectory " << torStateDir.string() << "\n";
+    // Data directory for Tor state.
+    // Use the tor_data directory itself as DataDirectory so that Tor creates
+    // its internal 'state' FILE at <tor_data>/state.  Older wallet builds
+    // erroneously created a subdirectory called 'state' and pointed
+    // DataDirectory at it; newer Tor versions (0.4.9+) reject that because
+    // they expect to write a plain file called 'state' inside DataDirectory.
+    //
+    // Recovery: if 'state' exists as a directory, move its contents up and
+    // remove it so that Tor can create its state file in the normal location.
+    {
+        fs::path badStateDir = dataPath / "state";
+        if (fs::exists(badStateDir) && fs::is_directory(badStateDir)) {
+            // Migrate any files inside the bad 'state/' directory up to dataPath
+            try {
+                for (auto& entry : fs::directory_iterator(badStateDir)) {
+                    fs::path dest = dataPath / entry.path().filename();
+                    if (!fs::exists(dest)) {
+                        fs::rename(entry.path(), dest);
+                    }
+                }
+                fs::remove(badStateDir);
+                printf("Auto-recovered: removed legacy 'state' directory from %s\n", dataPath.string().c_str());
+            } catch (const fs::filesystem_error& e) {
+                printf("WARNING: Could not auto-recover tor_data/state directory: %s\n", e.what());
+            }
+        }
+    }
+    torrc << "DataDirectory " << dataPath.string() << "\n";
 
     // Persistent Tor log for post-mortem debugging on user machines.
     fs::path torLogPath = dataPath / "tor.log";

src/trianglesrpc.cpp

@@ -546,10 +546,17 @@ int ReadHTTP(std::basic_istream<char>& stream, map<string, string>& mapHeadersRe
 bool HTTPAuthorized(map<string, string>& mapHeaders)
 {
     string strAuth = mapHeaders["authorization"];
-    if (strAuth.substr(0,6) != "Basic ")
+    if (strAuth.size() < 6 || strAuth.substr(0,6) != "Basic ")
         return false;
     string strUserPass64 = strAuth.substr(6); strUserPass64 = TrimString(strUserPass64);
-    string strUserPass = DecodeBase64(strUserPass64);
+    if (strUserPass64.empty())
+        return false;
+    string strUserPass;
+    try {
+        strUserPass = DecodeBase64(strUserPass64);
+    } catch (const std::exception&) {
+        return false;
+    }
     return TimingResistantEqual(strUserPass, strRPCUserColonPass);
 }
 
@@ -783,44 +790,61 @@ static void RPCAcceptHandler(boost::shared_ptr< basic_socket_acceptor<Protocol,
 {
     vnThreadsRunning[THREAD_RPCLISTENER]++;
 
-    // Immediately start accepting new connections, except when we're cancelled or our socket is closed.
-    if (error != asio::error::operation_aborted
-     && acceptor->is_open())
-        RPCListen(acceptor, context, fUseSSL);
+    try {
+        // Immediately start accepting new connections, except when we're cancelled or our socket is closed.
+        if (error != asio::error::operation_aborted
+         && acceptor->is_open())
+            RPCListen(acceptor, context, fUseSSL);
 
-    AcceptedConnectionImpl<ip::tcp>* tcp_conn = dynamic_cast< AcceptedConnectionImpl<ip::tcp>* >(conn);
+        AcceptedConnectionImpl<ip::tcp>* tcp_conn = dynamic_cast< AcceptedConnectionImpl<ip::tcp>* >(conn);
 
-    if (error)
-    {
-        if (error != asio::error::operation_aborted)
-            printf("RPC accept error from %s: %s (%d)\n",
-                   tcp_conn ? tcp_conn->peer.address().to_string().c_str() : "unknown peer",
-                   error.message().c_str(),
-                   error.value());
+        if (error)
+        {
+            if (error != asio::error::operation_aborted)
+                printf("RPC accept error from %s: %s (%d)\n",
+                       tcp_conn ? tcp_conn->peer.address().to_string().c_str() : "unknown peer",
+                       error.message().c_str(),
+                       error.value());
+            delete conn;
+            vnThreadsRunning[THREAD_RPCLISTENER]--;
+            return;
+        }
+
+        // Restrict callers by IP.  It is important to
+        // do this before starting client thread, to filter out
+        // certain DoS and misbehaving clients.
+        else if (tcp_conn
+              && !ClientAllowed(tcp_conn->peer.address()))
+        {
+            // Only send a 403 if we're not using SSL to prevent a DoS during the SSL handshake.
+            try {
+                if (!fUseSSL)
+                    conn->stream() << HTTPReply(HTTP_FORBIDDEN, "", false) << std::flush;
+            } catch (const std::exception& e) {
+                printf("RPC error sending 403 to %s: %s\n",
+                       tcp_conn->peer.address().to_string().c_str(), e.what());
+            }
+            delete conn;
+            vnThreadsRunning[THREAD_RPCLISTENER]--;
+            return;
+        }
+
+        // start HTTP client thread
+        else if (!NewThread(ThreadRPCServer3, conn)) {
+            printf("Failed to create RPC server client thread\n");
+            delete conn;
+        }
+
+        vnThreadsRunning[THREAD_RPCLISTENER]--;
+    } catch (std::exception& e) {
+        PrintException(&e, "RPCAcceptHandler()");
         delete conn;
         vnThreadsRunning[THREAD_RPCLISTENER]--;
-        return;
-    }
-
-    // Restrict callers by IP.  It is important to
-    // do this before starting client thread, to filter out
-    // certain DoS and misbehaving clients.
-    else if (tcp_conn
-          && !ClientAllowed(tcp_conn->peer.address()))
-    {
-        // Only send a 403 if we're not using SSL to prevent a DoS during the SSL handshake.
-        if (!fUseSSL)
-            conn->stream() << HTTPReply(HTTP_FORBIDDEN, "", false) << std::flush;
+    } catch (...) {
+        PrintException(NULL, "RPCAcceptHandler()");
         delete conn;
+        vnThreadsRunning[THREAD_RPCLISTENER]--;
     }
-
-    // start HTTP client thread
-    else if (!NewThread(ThreadRPCServer3, conn)) {
-        printf("Failed to create RPC server client thread\n");
-        delete conn;
-    }
-
-    vnThreadsRunning[THREAD_RPCLISTENER]--;
 }
 
 void ThreadRPCServer2(void* parg)
@@ -1128,6 +1152,7 @@ void ThreadRPCServer3(void* parg)
     AcceptedConnection *conn = (AcceptedConnection *) parg;
 
     bool fRun = true;
+    try {
     while (true)
     {
         if (fShutdown || !fRun)
@@ -1247,6 +1272,13 @@ void ThreadRPCServer3(void* parg)
         }
     }
 
+    } // end try
+    catch (std::exception& e) {
+        PrintException(&e, "ThreadRPCServer3()");
+    } catch (...) {
+        PrintException(NULL, "ThreadRPCServer3()");
+    }
+
     delete conn;
     {
         LOCK(cs_THREAD_RPCHANDLER);

src/txdb-leveldb.cpp

@@ -514,6 +514,20 @@ bool CTxDB::LoadBlockIndex()
     nBestHeight = pindexBest->nHeight;
     nBestChainTrust = pindexBest->nChainTrust;
 
+    // Heal pnext pointers along the active chain.  Persisted hashNext can be
+    // stale or zeroed by crash-interrupted reorgs, which breaks
+    // GetKernelStakeModifier()'s forward walk and causes valid new
+    // proof-of-stake blocks to be rejected with "check kernel failed".
+    {
+        int nHealed = 0;
+        for (CBlockIndex* p = pindexBest; p && p->pprev; p = p->pprev)
+        {
+            if (p->pprev->pnext != p) { p->pprev->pnext = p; nHealed++; }
+        }
+        if (nHealed > 0)
+            printf("LoadBlockIndex(): healed %d pnext links on active chain\n", nHealed);
+    }
+
     printf("STARTUP-PERF: best_chain %" PRId64 "ms\n", GetTimeMillis() - nPhaseStart);
 
     nPhaseStart = GetTimeMillis();

src/txdb-leveldb.h

@@ -42,12 +42,13 @@ public:
 
     bool LoadBlockIndex() override;
 
+    std::unique_ptr<CTxDBIteratorBase> NewIterator() const override;
+
 protected:
     bool ReadRaw(const std::string& key, std::string& value) const override;
     bool WriteRaw(const std::string& key, const std::string& value) override;
     bool EraseRaw(const std::string& key) override;
     bool ExistsRaw(const std::string& key) const override;
-    std::unique_ptr<CTxDBIteratorBase> NewIterator() const override;
 
 private:
     leveldb::DB* pdb;                  // Points to the global instance.

src/txdb-rocksdb.cpp

@@ -542,6 +542,20 @@ bool CRocksTxDB::LoadBlockIndex()
     nBestHeight = pindexBest->nHeight;
     nBestChainTrust = pindexBest->nChainTrust;
 
+    // Heal pnext pointers along the active chain.  Persisted hashNext can be
+    // stale or zeroed by crash-interrupted reorgs, which breaks
+    // GetKernelStakeModifier()'s forward walk and causes valid new
+    // proof-of-stake blocks to be rejected with "check kernel failed".
+    {
+        int nHealed = 0;
+        for (CBlockIndex* p = pindexBest; p && p->pprev; p = p->pprev)
+        {
+            if (p->pprev->pnext != p) { p->pprev->pnext = p; nHealed++; }
+        }
+        if (nHealed > 0)
+            printf("LoadBlockIndex(): healed %d pnext links on active chain\n", nHealed);
+    }
+
     printf("STARTUP-PERF: best_chain %" PRId64 "ms\n", GetTimeMillis() - nPhaseStart);
 
     nPhaseStart = GetTimeMillis();

src/txdb-rocksdb.h

@@ -38,12 +38,22 @@ public:
 
     bool LoadBlockIndex() override;
 
+    // Write a raw serialized key/value pair, bypassing the typed Write<>()
+    // overloads. Intended for the chaindb migration utility, which carries
+    // bytes directly across from a CTxDB (LevelDB) iterator. Honors the
+    // active write batch if one is open.
+    bool WriteRawRecordForMigration(const std::string& key, const std::string& value)
+    {
+        return WriteRaw(key, value);
+    }
+
+    std::unique_ptr<CTxDBIteratorBase> NewIterator() const override;
+
 protected:
     bool ReadRaw(const std::string& key, std::string& value) const override;
     bool WriteRaw(const std::string& key, const std::string& value) override;
     bool EraseRaw(const std::string& key) override;
     bool ExistsRaw(const std::string& key) const override;
-    std::unique_ptr<CTxDBIteratorBase> NewIterator() const override;
 
 private:
     rocksdb::DB* pdb;                   // Points to the global instance.

src/util.cpp

@@ -600,6 +600,37 @@ bool SoftSetBoolArg(const std::string& strArg, bool fValue)
         return SoftSetArg(strArg, std::string("0"));
 }
 
+// C++20 modernization: std::string_view overloads delegating to std::string implementations
+std::string GetArg(std::string_view strArg, std::string_view strDefault)
+{
+    return GetArg(std::string(strArg), std::string(strDefault));
+}
+
+int64_t GetArg(std::string_view strArg, int64_t nDefault)
+{
+    return GetArg(std::string(strArg), nDefault);
+}
+
+bool GetBoolArg(std::string_view strArg, bool fDefault)
+{
+    return GetBoolArg(std::string(strArg), fDefault);
+}
+
+bool SoftSetArg(std::string_view strArg, std::string_view strValue)
+{
+    return SoftSetArg(std::string(strArg), std::string(strValue));
+}
+
+bool SoftSetBoolArg(std::string_view strArg, bool fValue)
+{
+    return SoftSetBoolArg(std::string(strArg), fValue);
+}
+
+bool WildcardMatch(std::string_view str, std::string_view mask)
+{
+    return WildcardMatch(std::string(str), std::string(mask));
+}
+
 
 string EncodeBase64(const unsigned char* pch, size_t len)
 {

src/util.h

@@ -20,6 +20,7 @@
 #include <string_view>
 #include <sstream>
 #include <algorithm>
+#include <cstdio>
 
 #include <chrono>
 #include <thread>
@@ -190,6 +191,9 @@ bool ATTR_WARN_PRINTF(1,2) error(const char *format, ...);
 #define printf OutputDebugStringF
 
 void LogException(std::exception* pex, const char* pszThread);
+
+// LogPrintf - variadic macro for logging to stderr (C++20 modernization: restored from removed definition)
+#define LogPrintf(...) fprintf(stderr, __VA_ARGS__)
 void PrintException(std::exception* pex, const char* pszThread);
 void PrintExceptionContinue(std::exception* pex, const char* pszThread);
 void ParseString(std::string_view str, char c, std::vector<std::string>& v);

src/wallet.cpp

@@ -12,6 +12,7 @@
 #include "kernel.h"
 #include "coincontrol.h"
 #include "addressindex.h"
+#include "util.h"
 #include <memory>
 #include <algorithm>
 #include <random>
@@ -483,7 +484,7 @@ void CWallet::WalletUpdateSpent(const CTransaction &tx, bool fBlock)
                     if (!IsInitialBlockDownload())
                     {
                         try { NotifyTransactionChanged(this, txin.prevout.hash, CT_UPDATED); }
-                        catch (...) { LogPrintf("WARNING: NotifyTransactionChanged exception in WalletUpdateSpent\n"); }
+                        catch (...) { printf("WARNING: NotifyTransactionChanged exception in WalletUpdateSpent\n"); }
                     }
                 }
             }
@@ -504,7 +505,7 @@ void CWallet::WalletUpdateSpent(const CTransaction &tx, bool fBlock)
                     if (!IsInitialBlockDownload())
                     {
                         try { NotifyTransactionChanged(this, hash, CT_UPDATED); }
-                        catch (...) { LogPrintf("WARNING: NotifyTransactionChanged exception in WalletUpdateSpent\n"); }
+                        catch (...) { printf("WARNING: NotifyTransactionChanged exception in WalletUpdateSpent\n"); }
                     }
                 }
             }
@@ -2162,7 +2163,7 @@ bool CWallet::CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey)
                 coin.MarkSpent(txin.prevout.n);
                 coin.WriteToDisk();
                 try { NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED); }
-                catch (...) { LogPrintf("WARNING: NotifyTransactionChanged exception in CommitTransaction\n"); }
+                catch (...) { printf("WARNING: NotifyTransactionChanged exception in CommitTransaction\n"); }
             }
 
             if (fFileBacked)
@@ -2292,7 +2293,7 @@ bool CWallet::SetAddressBookName(const CTxDestination& address, const string& st
         SecureMsgWalletKeyChanged(caddress.ToString(), strName, nMode);
     }
     try { NotifyAddressBookChanged(this, address, strName, fOwned, nMode); }
-    catch (...) { LogPrintf("WARNING: NotifyAddressBookChanged exception in SetAddressBookName\n"); }
+    catch (...) { printf("WARNING: NotifyAddressBookChanged exception in SetAddressBookName\n"); }
 
     if (!fFileBacked)
         return false;
@@ -2315,7 +2316,7 @@ bool CWallet::DelAddressBookName(const CTxDestination& address)
         SecureMsgWalletKeyChanged(caddress.ToString(), sName, CT_DELETED);
     }
     try { NotifyAddressBookChanged(this, address, "", fOwned, CT_DELETED); }
-    catch (...) { LogPrintf("WARNING: NotifyAddressBookChanged exception in DelAddressBookName\n"); }
+    catch (...) { printf("WARNING: NotifyAddressBookChanged exception in DelAddressBookName\n"); }
 
     if (!fFileBacked)
         return false;
@@ -2794,7 +2795,7 @@ void CWallet::UpdatedTransaction(const uint256 &hashTx)
         if (auto mi = mapWallet.find(hashTx); mi != mapWallet.end() && !IsInitialBlockDownload())
         {
             try { NotifyTransactionChanged(this, hashTx, CT_UPDATED); }
-            catch (...) { LogPrintf("WARNING: NotifyTransactionChanged exception in UpdatedTransaction\n"); }
+            catch (...) { printf("WARNING: NotifyTransactionChanged exception in UpdatedTransaction\n"); }
         }
     }
 }