fix: add retry for Bitcoin signing

e2e/runner/bitcoin.go

@@ -240,13 +240,10 @@ func (runner *E2ERunner) SendToTSSFromDeployerWithMemo(
 		}
 	}
 
-	stx, signed, err := btcRPC.SignRawTransactionWithWallet2(tx, inputsForSign)
+	stx, err := signRawTransactionWithWallet2WithRetry(btcRPC, tx, inputsForSign)
 	if err != nil {
 		panic(err)
 	}
-	if !signed {
-		panic("btc transaction not signed")
-	}
 	txid, err := btcRPC.SendRawTransaction(stx, true)
 	if err != nil {
 		panic(err)
@@ -407,3 +404,23 @@ func (runner *E2ERunner) ProveBTCTransaction(txHash *chainhash.Hash) {
 	}
 	runner.Logger.Info("OK: txProof verified for inTx: %s", txHash.String())
 }
+
+// SignRawTransactionWithWallet2WithRetry signs a raw transaction with wallet2 and retries if it's not signed
+func signRawTransactionWithWallet2WithRetry(
+	btcRPC *rpcclient.Client,
+	tx *wire.MsgTx,
+	inputsForSign []btcjson.RawTxWitnessInput,
+) (*wire.MsgTx, error) {
+	for i := 0; i < 5; i++ {
+		stx, signed, err := btcRPC.SignRawTransactionWithWallet2(tx, inputsForSign)
+		if err != nil {
+			return nil, err
+		}
+		if signed {
+			return stx, nil
+		}
+		time.Sleep(2 * time.Second)
+	}
+
+	return nil, fmt.Errorf("signRawTransactionWithWallet2WithRetry: not signed")
+}