diff --git a/node/bridge_api.py b/node/bridge_api.py
index ee76ef205..1a5005531 100644
--- a/node/bridge_api.py
+++ b/node/bridge_api.py
@@ -440,6 +440,7 @@ def get_bridge_transfer_by_hash(
         "dest_chain": row[3],
         "source_address": row[4],
         "dest_address": row[5],
+        "amount_i64": row[6],
         "amount_rtc": row[7],
         "bridge_type": row[8],
         "external_tx_hash": row[10],
@@ -640,6 +641,7 @@ def update_external_confirmation(
         completed_at = None
     
     try:
+        cursor.execute("BEGIN IMMEDIATE")
         cursor.execute("""
             UPDATE bridge_transfers
             SET external_tx_hash = ?,
@@ -649,7 +651,21 @@ def update_external_confirmation(
                 completed_at = ?,
                 updated_at = ?
             WHERE tx_hash = ?
+              AND status IN ('pending', 'locked', 'confirming')
         """, (external_tx_hash, confirmations, req_conf, new_status, completed_at, now, tx_hash))
+
+        if cursor.rowcount != 1:
+            current = cursor.execute(
+                "SELECT status FROM bridge_transfers WHERE tx_hash = ?",
+                (tx_hash,),
+            ).fetchone()
+            db_conn.rollback()
+            if not current:
+                return False, {"error": "Bridge transfer not found"}
+            return False, {
+                "error": "Cannot update completed/failed/voided transfer",
+                "current_status": current[0],
+            }
         
         # If completed, release the lock
         if new_status == "completed":
@@ -661,6 +677,15 @@ def update_external_confirmation(
                 WHERE bridge_transfer_id = ?
                   AND status = 'locked'
             """, (now, external_tx_hash, transfer["id"]))
+            if transfer["direction"] == "withdraw":
+                cursor.execute(
+                    "INSERT OR IGNORE INTO balances (miner_id, amount_i64) VALUES (?, 0)",
+                    (transfer["dest_address"],),
+                )
+                cursor.execute(
+                    "UPDATE balances SET amount_i64 = amount_i64 + ? WHERE miner_id = ?",
+                    (transfer["amount_i64"], transfer["dest_address"]),
+                )
         
         db_conn.commit()
         
diff --git a/node/test_bridge_withdraw_completion_credits_destination_poc.py b/node/test_bridge_withdraw_completion_credits_destination_poc.py
new file mode 100644
index 000000000..250d6c89d
--- /dev/null
+++ b/node/test_bridge_withdraw_completion_credits_destination_poc.py
@@ -0,0 +1,115 @@
+# SPDX-License-Identifier: MIT
+
+import os
+import sqlite3
+import tempfile
+import unittest
+
+import bridge_api
+from bridge_api import (
+    BRIDGE_UNIT,
+    BridgeTransferRequest,
+    create_bridge_transfer,
+    init_bridge_schema,
+    update_external_confirmation,
+)
+from lock_ledger import init_lock_ledger_schema
+
+
+class TestBridgeWithdrawCompletionCreditsDestination(unittest.TestCase):
+    def setUp(self):
+        self.tmp = tempfile.NamedTemporaryFile(suffix=".db", delete=False)
+        self.tmp.close()
+        self.db_path = self.tmp.name
+        self.conn = sqlite3.connect(self.db_path)
+        self.conn.execute(
+            "CREATE TABLE balances (miner_id TEXT PRIMARY KEY, amount_i64 INTEGER DEFAULT 0)"
+        )
+        init_bridge_schema(self.conn.cursor())
+        init_lock_ledger_schema(self.conn.cursor())
+        self.conn.commit()
+
+    def tearDown(self):
+        self.conn.close()
+        os.unlink(self.db_path)
+
+    def test_completed_external_to_rustchain_withdraw_credits_destination(self):
+        request = BridgeTransferRequest(
+            direction="withdraw",
+            source_chain="solana",
+            dest_chain="rustchain",
+            source_address="A" * 32,
+            dest_address="RTCdest1234",
+            amount_rtc=10.0,
+        )
+
+        ok, result = create_bridge_transfer(self.conn, request, admin_initiated=False)
+        self.assertTrue(ok, result)
+
+        ok, result = update_external_confirmation(
+            self.conn,
+            result["tx_hash"],
+            external_tx_hash="solana_tx_123",
+            confirmations=12,
+            required_confirmations=12,
+        )
+        self.assertTrue(ok, result)
+        self.assertEqual(result["status"], "completed")
+
+        balance_i64 = self.conn.execute(
+            "SELECT amount_i64 FROM balances WHERE miner_id = ?",
+            ("RTCdest1234",),
+        ).fetchone()[0]
+        self.assertEqual(balance_i64, 10 * BRIDGE_UNIT)
+
+    def test_stale_completed_callback_does_not_credit_destination_twice(self):
+        request = BridgeTransferRequest(
+            direction="withdraw",
+            source_chain="solana",
+            dest_chain="rustchain",
+            source_address="B" * 32,
+            dest_address="RTCdest5678",
+            amount_rtc=10.0,
+        )
+
+        ok, result = create_bridge_transfer(self.conn, request, admin_initiated=False)
+        self.assertTrue(ok, result)
+
+        stale_transfer = bridge_api.get_bridge_transfer_by_hash(self.conn, result["tx_hash"])
+
+        ok, first_result = update_external_confirmation(
+            self.conn,
+            result["tx_hash"],
+            external_tx_hash="solana_tx_456",
+            confirmations=12,
+            required_confirmations=12,
+        )
+        self.assertTrue(ok, first_result)
+        self.assertEqual(first_result["status"], "completed")
+
+        original_get_bridge_transfer_by_hash = bridge_api.get_bridge_transfer_by_hash
+        try:
+            bridge_api.get_bridge_transfer_by_hash = (
+                lambda conn, tx_hash: stale_transfer
+                if tx_hash == result["tx_hash"]
+                else original_get_bridge_transfer_by_hash(conn, tx_hash)
+            )
+            update_external_confirmation(
+                self.conn,
+                result["tx_hash"],
+                external_tx_hash="solana_tx_456",
+                confirmations=12,
+                required_confirmations=12,
+            )
+        finally:
+            bridge_api.get_bridge_transfer_by_hash = original_get_bridge_transfer_by_hash
+
+        balance_i64 = self.conn.execute(
+            "SELECT amount_i64 FROM balances WHERE miner_id = ?",
+            ("RTCdest5678",),
+        ).fetchone()[0]
+        self.assertEqual(balance_i64, 10 * BRIDGE_UNIT)
+
+
+if __name__ == "__main__":
+    unittest.main()