Send TX and messages to .onion addresses

- Address validator accepts V3 .onion format (62 chars, base32 + .onion)
- WalletModel::validateAddress() recognizes .onion via ValidateOnionAddress()
- Send coins/messages dialogs resolve .onion to TRI before sending
- Auto-request getwalletaddr from onion peers after version handshake
- Placeholder text updated to "Enter a TRI address or .onion address"
- Shows info dialog if resolution is pending (async connect + resolve)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main.cpp

@@ -4064,6 +4064,17 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
 
         pfrom->fSuccessfullyConnected = true;
 
+        // If this is an onion peer and we have a pending resolve, request their wallet address
+        {
+            std::string peerAddr = pfrom->addr.ToStringIP();
+            if (peerAddr.find(".onion") != std::string::npos)
+            {
+                CTorV3Manager* torMgr = CTorV3Manager::GetInstance();
+                if (torMgr)
+                    torMgr->RequestWalletAddress(pfrom);
+            }
+        }
+
         printf("receive version message: version %d, blocks=%d, us=%s, them=%s, peer=%s\n", pfrom->nVersion, pfrom->nStartingHeight, addrMe.ToString().c_str(), addrFrom.ToString().c_str(), pfrom->addr.ToString().c_str());
 
         cPeerBlockCounts.input(pfrom->nStartingHeight);

src/qt/sendcoinsdialog.cpp

@@ -15,9 +15,11 @@
 
 #include "coincontrol.h"
 #include "coincontroldialog.h"
+#include "tor/onion_v3.h"
 
 #include <QMessageBox>
 #include <QLocale>
+#include <QApplication>
 #include <QTextDocument>
 #include <QScrollBar>
 #include <QClipboard>
@@ -145,6 +147,37 @@ void SendCoinsDialog::on_sendButton_clicked()
         return;
     }
 
+    // Resolve any .onion addresses to TRI addresses
+    CTorV3Manager* torMgr = CTorV3Manager::GetInstance();
+    for(int i = 0; i < recipients.size(); ++i)
+    {
+        std::string addr = recipients[i].address.toStdString();
+        if (addr.size() == 62 && addr.substr(addr.size() - 6) == ".onion")
+        {
+            std::string triAddr;
+            if (torMgr && torMgr->LookupCachedOnionAddress(addr, triAddr))
+            {
+                // Found in cache — substitute
+                recipients[i].address = QString::fromStdString(triAddr);
+                if (recipients[i].label.isEmpty())
+                    recipients[i].label = QString::fromStdString(addr);
+            }
+            else
+            {
+                // Not cached — initiate async resolution and tell user to wait
+                if (torMgr)
+                    torMgr->ResolveOnionAddress(addr, triAddr);
+
+                QMessageBox::information(this, tr("Resolving .onion Address"),
+                    tr("Connecting to %1 to resolve their TRI address.\n\n"
+                       "Please wait a moment and try again.")
+                    .arg(recipients[i].address));
+                fNewRecipientAllowed = true;
+                return;
+            }
+        }
+    }
+
     // Format confirmation message
     QStringList formatted;
     foreach(const SendCoinsRecipient &rcp, recipients)

src/qt/sendcoinsentry.cpp

@@ -23,7 +23,7 @@ SendCoinsEntry::SendCoinsEntry(QWidget *parent) :
 #if QT_VERSION >= 0x040700
     /* Do not move this to the XML file, Qt before 4.7 will choke on it */
     ui->addAsLabel->setPlaceholderText(tr("Enter a label for this address to add it to your address book"));
-    ui->payTo->setPlaceholderText(tr("Enter a TRI address (e.g. TXc7mPCNFFpinDonuSH5PNVY9S8nBcvGQm)"));
+    ui->payTo->setPlaceholderText(tr("Enter a TRI address or .onion address"));
 	ui->narration->setPlaceholderText(tr("Enter a short note to send with payment. This feature will be enabled later."));
     ui->narration->setEnabled(false);
     ui->narration->setVisible(false);

src/qt/sendmessagesdialog.cpp

@@ -8,6 +8,7 @@
 #include "sendmessagesentry.h"
 #include "dialog_move_handler.h"
 #include "guiutil.h"
+#include "tor/onion_v3.h"
 
 #include <QMessageBox>
 #include <QLocale>
@@ -155,6 +156,35 @@ void SendMessagesDialog::on_sendButton_clicked()
     if(!valid || recipients.isEmpty())
         return;
 
+    // Resolve any .onion addresses to TRI addresses
+    CTorV3Manager* torMgr = CTorV3Manager::GetInstance();
+    for(int i = 0; i < recipients.size(); ++i)
+    {
+        std::string addr = recipients[i].address.toStdString();
+        if (addr.size() == 62 && addr.substr(addr.size() - 6) == ".onion")
+        {
+            std::string triAddr;
+            if (torMgr && torMgr->LookupCachedOnionAddress(addr, triAddr))
+            {
+                recipients[i].address = QString::fromStdString(triAddr);
+                if (recipients[i].label.isEmpty())
+                    recipients[i].label = QString::fromStdString(addr);
+            }
+            else
+            {
+                if (torMgr)
+                    torMgr->ResolveOnionAddress(addr, triAddr);
+
+                QMessageBox::information(this, tr("Resolving .onion Address"),
+                    tr("Connecting to %1 to resolve their TRI address.\n\n"
+                       "Please wait a moment and try again.")
+                    .arg(recipients[i].address));
+                fNewRecipientAllowed = true;
+                return;
+            }
+        }
+    }
+
     // Format confirmation message
     QStringList formatted;
     foreach(const SendMessagesRecipient &rcp, recipients)

src/qt/sendmessagesentry.cpp

@@ -25,7 +25,7 @@ SendMessagesEntry::SendMessagesEntry(QWidget *parent) :
 #if QT_VERSION >= 0x040700
     /* Do not move this to the XML file, Qt before 4.7 will choke on it */
     ui->addAsLabel->setPlaceholderText(tr("Enter a label for this address to add it to your address book"));
-    ui->sendTo->setPlaceholderText(tr("Enter a TRI address (e.g. TXc7mPCNFFpinDonuSH5PNVY9S8nBcvGQm)"));
+    ui->sendTo->setPlaceholderText(tr("Enter a TRI address or .onion address"));
     ui->publicKey->setPlaceholderText(tr("Enter the public key for the address above, it is not in the blockchain"));
     ui->messageText->setErrorText(tr("You cannot send a blank message!"));
 #endif

src/qt/trianglesaddressvalidator.cpp

@@ -50,11 +50,27 @@ QValidator::State TrianglesAddressValidator::validate(QString &input, int &pos)
 
     // Validation
     QValidator::State state = QValidator::Acceptable;
+
+    // Allow .onion addresses (base32 lowercase + digits 2-7 + period)
+    bool isOnion = input.endsWith(".onion");
+
     for(int idx=0; idx<input.size(); ++idx)
     {
         int ch = input.at(idx).unicode();
 
-        if(((ch >= '0' && ch<='9') ||
+        if (isOnion)
+        {
+            // V3 onion: base32 (a-z, 2-7) + ".onion" suffix
+            if ((ch >= 'a' && ch <= 'z') || (ch >= '2' && ch <= '7') || ch == '.')
+            {
+                // Valid onion character
+            }
+            else
+            {
+                state = QValidator::Invalid;
+            }
+        }
+        else if(((ch >= '0' && ch<='9') ||
            (ch >= 'a' && ch<='z') ||
            (ch >= 'A' && ch<='Z')) &&
            ch != 'l' && ch != 'I' && ch != '0' && ch != 'O')

src/qt/walletmodel.cpp

@@ -9,6 +9,7 @@
 #include "walletdb.h" // for BackupWallet
 #include "base58.h"
 #include "main.h"
+#include "tor/onion_v3.h"
 
 #include <QSet>
 #include <QTimer>
@@ -281,8 +282,11 @@ void WalletModel::updateAddressBook(const QString &address, const QString &label
 bool WalletModel::validateAddress(const QString &address)
 {
     std::string sAddr = address.toStdString();
-    
-    
+
+    // Accept V3 .onion addresses (56-char base32 + ".onion" = 62 chars)
+    if (sAddr.size() == 62 && sAddr.substr(sAddr.size() - 6) == ".onion")
+        return CTorV3Service::ValidateOnionAddress(sAddr);
+
     CTrianglesAddress addressParsed(sAddr);
     return addressParsed.IsValid();
 }