diff --git a/store/migrations/000003_fix_immutable_block_hash.down.sql b/store/migrations/000003_fix_immutable_block_hash.down.sql
new file mode 100644
index 0000000..a4dff9c
--- /dev/null
+++ b/store/migrations/000003_fix_immutable_block_hash.down.sql
@@ -0,0 +1 @@
+-- No-op: we don't want to re-wipe block_hash values.
diff --git a/store/migrations/000003_fix_immutable_block_hash.up.sql b/store/migrations/000003_fix_immutable_block_hash.up.sql
new file mode 100644
index 0000000..57676a9
--- /dev/null
+++ b/store/migrations/000003_fix_immutable_block_hash.up.sql
@@ -0,0 +1,8 @@
+-- Repopulate block_hash on transactions that were wiped when transitioning to IMMUTABLE.
+-- Joins through processed_blocks to ensure we use the canonical chain's block hash.
+UPDATE transactions
+SET block_hash = mp.block_hash
+FROM merkle_paths mp
+JOIN processed_blocks pb ON mp.block_hash = pb.block_hash AND pb.on_chain = 1
+WHERE transactions.txid = mp.txid
+  AND transactions.block_hash IS NULL;
diff --git a/store/sqlite/sqlite.go b/store/sqlite/sqlite.go
index a5d00e9..beb4147 100644
--- a/store/sqlite/sqlite.go
+++ b/store/sqlite/sqlite.go
@@ -161,18 +161,16 @@ func (s *Store) UpdateStatus(ctx context.Context, status *models.TransactionStat
 UPDATE transactions
 SET status = ?,
 	timestamp = ?,
-	block_hash = ?,
 	extra_info = ?,
 	competing_txs = json_set(competing_txs, '$.' || ?, json('true'))
 WHERE txid = ?
   AND status NOT IN (%s)
 `, strings.Join(placeholders, ","))
 
-		args = make([]interface{}, 0, 6+len(disallowed))
+		args = make([]interface{}, 0, 5+len(disallowed))
 		args = append(args,
 			status.Status,
 			status.Timestamp,
-			nullString(status.BlockHash),
 			nullString(status.ExtraInfo),
 			status.CompetingTxs[0],
 			status.TxID,
@@ -190,17 +188,15 @@ WHERE txid = ?
 UPDATE transactions
 SET status = ?,
 	timestamp = ?,
-	block_hash = ?,
 	extra_info = ?
 WHERE txid = ?
   AND status NOT IN (%s)
 `, strings.Join(placeholders, ","))
 
-		args = make([]interface{}, 0, 5+len(disallowed))
+		args = make([]interface{}, 0, 4+len(disallowed))
 		args = append(args,
 			status.Status,
 			status.Timestamp,
-			nullString(status.BlockHash),
 			nullString(status.ExtraInfo),
 			status.TxID,
 		)