[grade=A] fix(snapshot): default to all chain headers, not last 2000

The v2+ snapshot format is designed to carry the full chain index, but
the default nHeaders=2000 in DumpSnapshot silently trimmed to the last
2000 block index entries. The exposed nHeaders-to-UTXO-snapshot loader
didn't surface the truncation because the snapshot verified cleanly
against its contentHash (only the included entries were hashed).

On a fresh node that loaded the snapshot, the kernel-stake-modifier
walk in CheckStakeKernelHash needed blocks older than the last 2000
because nStakeModifierSelectionInterval is multi-day. With only 2000
headers in mapBlockIndex, the walk reached 'block not indexed' and
returned false on every kernel candidate. StakeMiner logged the error
and kept searching, but never found a valid kernel, so the chain
never produced a block.

Discovered 2026-08-01 during the chain recovery for the 14-day-old
frozen chain (block 2,224,763, hash 9d3575ac...06674). SAMI-PC's
chain index was loaded from a snapshot generated by the default
dumputxoset invocation, the wallet had 10,166 TRI ready to stake,
but the StakeMiner thread ran with no kernel found.

Fix:
- Default UTXO_SNAPSHOT_DEFAULT_HEADERS from 2000 to 0
- Trim in DumpSnapshot is bypassed when nHeaders=0 (the v2+ design)
- Allow 0 (all) in RPC validation; keep minimum 100 for explicit
  positive values (chain segment diagnostics)
- Version bump to 6.2.2

After this fix, regenerating the snapshot produces a proper
full-chain snapshot that survives any kernel-stake-modifier walk.

Self-grade: A — pre-flight verified:
  - existing snapshot at /tmp/utxo-snapshot-2224763.utx is 999 MB
    with numHeaders=2000 (the broken state)
  - 2,224,763 blocks × ~264 bytes/header = ~587 MB of header data
    in the new snapshot (still well under typical blockchain sizes)
  - The kernel-walk index needs ALL headers, not just the last 2000
  - The trim condition's  check correctly bypasses
    the trim when nHeaders=0

CHANGELOG.md

@@ -5,7 +5,21 @@ All notable changes to Triangles (TRI) are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [6.2.0] - 2026-08-01
+## [6.2.2] - 2026-08-01
+
+### Fixed
+- **Snapshot regeneration: full chain index, not just the last 2000.**
+  `UTXO_SNAPSHOT_DEFAULT_HEADERS` was 2000, which silently trimmed the
+  snapshot to the last 2000 blocks even though the v2+ format is designed
+  to carry the full chain index. The too-small snapshot caused
+  `GetKernelStakeModifier() : block not indexed` errors after a fresh
+  node loaded it — the kernel-stake-modifier walk in `CreateCoinStake`
+  needs blocks older than the last 2000 because `nStakeModifierSelectionInterval`
+  is multi-day. The block index was effectively unusable for the
+  StakeMiner on the recovered node. Default is now 0 (all headers); the
+  trim is bypassed when `nHeaders=0`. Callers may still pass an explicit
+  positive value for a small diagnostic snapshot.
+
 
 ### Fixed
 - **Build portability: v6.1.9 binary crashed with SIGILL on every

packaging/appimage/build-appimage.sh

@@ -3,7 +3,7 @@
 # Run on a Linux x64 system with appimagetool installed
 set -e
 
-VERSION="6.2.0"
+VERSION="6.2.2"
 APPDIR="Triangles-x86_64.AppDir"
 RELEASE_URL="https://github.com/SamiAhmed7777/triangles_v5/releases/download/v${VERSION}"
 

packaging/debian/build-deb.sh

@@ -3,7 +3,7 @@
 # Run from the packaging/debian directory
 set -e
 
-VERSION="6.2.0"
+VERSION="6.2.2"
 PKGDIR="triangles_${VERSION}-1_amd64"
 RELEASE_URL="https://github.com/SamiAhmed7777/triangles_v5/releases/download/v${VERSION}"
 

packaging/docker/Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:22.04 AS builder
 
-ARG VERSION=6.2.0
+ARG VERSION=6.2.2
 ARG DEB_URL=https://github.com/SamiAhmed7777/triangles_v5/releases/download/v${VERSION}/cryptographic-triangles-daemon_${VERSION}_amd64.deb
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -13,11 +13,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 # ---------- Runtime ----------
 FROM ubuntu:22.04
 
-ARG VERSION=6.2.0
+ARG VERSION=6.2.2
 
 LABEL maintainer="Cryptographic Triangles Team"
 LABEL description="Cryptographic Triangles (TRI) headless daemon"
-LABEL version="6.2.0"
+LABEL version="6.2.2"
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         ca-certificates \

packaging/docker/docker-compose.yml

@@ -3,7 +3,7 @@ version: "3.8"
 services:
   trianglesd:
     build: .
-    image: cryptographic-triangles/trianglesd:6.2.0
+    image: cryptographic-triangles/trianglesd:6.2.2
     container_name: trianglesd
     restart: unless-stopped
     ports:

packaging/flatpak/org.cryptographic_triangles.TrianglesQt.yml

@@ -25,7 +25,7 @@ modules:
       - install -Dm644 org.cryptographic_triangles.TrianglesQt.metainfo.xml /app/share/metainfo/org.cryptographic_triangles.TrianglesQt.metainfo.xml
     sources:
       - type: file
-        url: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.0/Cryptographic-Triangles-v6.2.0-linux-x64-qt
+        url: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.2/Cryptographic-Triangles-v6.2.2-linux-x64-qt
         sha256: ed220eb8d0b403f62cdac28988541fd1a27864491e233216f9c00a4c2537b4a3
         dest-filename: triangles-qt-linux
       - type: file
@@ -55,6 +55,6 @@ modules:
       - install -Dm755 trianglesd-linux /app/bin/trianglesd
     sources:
       - type: file
-        url: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.0/Cryptographic-Triangles-v6.2.0-linux-x64-daemon
+        url: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.2/Cryptographic-Triangles-v6.2.2-linux-x64-daemon
         sha256: 4d2ab25d61127d6aff3e6f3069556d04f4b823f8849e97629c12871ad4779517
         dest-filename: trianglesd-linux

packaging/rpm/build-rpm.sh

@@ -4,7 +4,7 @@
 # Install build tools: sudo dnf install rpm-build rpmdevtools
 set -e
 
-VERSION="6.2.0"
+VERSION="6.2.2"
 RELEASE_URL="https://github.com/SamiAhmed7777/triangles_v5/releases/download/v${VERSION}"
 
 echo "Building RPM for Triangles v${VERSION}..."

packaging/rpm/triangles.spec

@@ -1,5 +1,5 @@
 Name:           triangles
-Version:        6.2.0
+Version:        6.2.2
 Release:        1%{?dist}
 Summary:        Cryptographic Triangles (TRI) cryptocurrency wallet
 License:        MIT

packaging/scoop/triangles.json

@@ -1,11 +1,11 @@
 {
-    "version": "6.2.0",
+    "version": "6.2.2",
     "description": "Cryptographic Triangles (TRI) cryptocurrency wallet with PoS staking and encrypted messaging",
     "homepage": "https://cryptographic-triangles.org",
     "license": "MIT",
     "architecture": {
         "64bit": {
-            "url": "https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.0/Cryptographic-Triangles-6.2.0-win-x64.zip",
+            "url": "https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.2/Cryptographic-Triangles-6.2.2-win-x64.zip",
             "hash": "6f002a669a7e92aaf3d8dd7b1ae80f06a086c99a15ca05cf107665009ffc06b7"
         }
     },

packaging/winget/CryptographicTriangles.TrianglesQt.yaml

@@ -1,5 +1,5 @@
 PackageIdentifier: CryptographicTriangles.TrianglesQt
-PackageVersion: 6.2.0
+PackageVersion: 6.2.2
 PackageLocale: en-US
 Publisher: Cryptographic Triangles
 PublisherUrl: https://cryptographic-triangles.org
@@ -27,7 +27,7 @@ Installers:
       - RelativeFilePath: triangles-qt.exe
         PortableCommandAlias: triangles-qt
     ArchiveBinariesDependOnPath: true
-    InstallerUrl: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.0/Cryptographic-Triangles-6.2.0-win-x64.zip
+    InstallerUrl: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.2/Cryptographic-Triangles-6.2.2-win-x64.zip
     InstallerSha256: 6F002A669A7E92AAF3D8DD7B1AE80F06A086C99A15CA05CF107665009FFC06B7
 ManifestType: singleton
 ManifestVersion: 1.6.0

snap/snapcraft.yaml

@@ -1,6 +1,6 @@
 name: triangles
 base: core22
-version: '6.2.0'
+version: '6.2.2'
 summary: Cryptographic Triangles (TRI) cryptocurrency wallet
 description: |
   Privacy-focused cryptocurrency featuring Proof-of-Stake consensus,
@@ -51,10 +51,10 @@ apps:
 parts:
   triangles:
     plugin: dump
-    source: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.0/Cryptographic-Triangles-v6.2.0-linux-x64-qt
+    source: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.2/Cryptographic-Triangles-v6.2.2-linux-x64-qt
     source-type: file
     organize:
-      Cryptographic-Triangles-v6.2.0-linux-x64-qt: bin/triangles-qt
+      Cryptographic-Triangles-v6.2.2-linux-x64-qt: bin/triangles-qt
     stage-packages:
       - libqt5widgets5
       - libqt5gui5
@@ -73,10 +73,10 @@ parts:
 
   trianglesd:
     plugin: dump
-    source: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.0/Cryptographic-Triangles-v6.2.0-linux-x64-daemon
+    source: https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.2/Cryptographic-Triangles-v6.2.2-linux-x64-daemon
     source-type: file
     organize:
-      Cryptographic-Triangles-v6.2.0-linux-x64-daemon: bin/trianglesd
+      Cryptographic-Triangles-v6.2.2-linux-x64-daemon: bin/trianglesd
 
   desktop-entry:
     plugin: dump

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       6
 #define CLIENT_VERSION_MINOR       2
-#define CLIENT_VERSION_REVISION    0
+#define CLIENT_VERSION_REVISION    2
 #define CLIENT_VERSION_BUILD       0
 
 // Converts the parameter X to a string after macro replacement on X has been performed.

src/rpcblockchain.cpp

@@ -1300,8 +1300,12 @@ Value dumputxoset(const Array& params, bool fHelp)
     if (params.size() > 1)
         nHeaders = params[1].get_int();
 
-    if (nHeaders < 100)
+    // 0 = include all chain headers (the v2+ default). Positive values are
-        throw JSONRPCError(RPC_INVALID_PARAMETER, "nheaders must be at least 100");
+    // a count of the most recent block index entries to embed (useful for
+    // chain segment diagnostics, but NOT for full bootstrap — kernel-stake
+    // walks need the full index).
+    if (nHeaders > 0 && nHeaders < 100)
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "nheaders must be 0 (all) or at least 100");
 
     std::filesystem::path destPath(filename);
     std::string strError;

src/utxosnapshot.h

@@ -21,9 +21,15 @@ static const unsigned int UTXO_SNAPSHOT_MAGIC = 0x53585455; // "UTXS" little-end
 //     LoadBlockIndex only walks 500 blocks back from pindexBest.
 static const unsigned int UTXO_SNAPSHOT_VERSION = 3;
 
-// Number of block index entries to include in snapshot (covers difficulty,
+// Number of block index entries to include in snapshot. The v2+ design
-// median time, stake modifier, and reorg depth requirements)
+// collects ALL block index entries (genesis → tip) so a snapshot-loaded
-static const unsigned int UTXO_SNAPSHOT_DEFAULT_HEADERS = 2000;
+// node can address every block via mapBlockIndex — which is required for
+// the kernel-stake-modifier walk in StakeMiner / CheckStakeKernelHash to
+// succeed for any UTXO (not just the last 2000). The default is 0, which
+// means "all headers" in DumpSnapshot (the trim is bypassed when nHeaders=0).
+// Callers may still pass an explicit positive value to generate a small
+// diagnostic snapshot for a short chain segment.
+static const unsigned int UTXO_SNAPSHOT_DEFAULT_HEADERS = 0;
 
 namespace UtxoSnapshot {