diff --git a/backend/mpc-system/services/service-party-app/tss-party/main.go b/backend/mpc-system/services/service-party-app/tss-party/main.go
index 5f8fb8bd..66bc367c 100644
--- a/backend/mpc-system/services/service-party-app/tss-party/main.go
+++ b/backend/mpc-system/services/service-party-app/tss-party/main.go
@@ -484,9 +484,15 @@ func sendResult(publicKey, encryptedShare []byte, partyIndex int) {
 }
 
 func sendSignResult(signature []byte, recoveryID int, partyIndex int) {
+	// Append recovery ID to signature (r + s + v = 64 + 1 = 65 bytes)
+	// This is needed for EVM transaction signing
+	signatureWithV := make([]byte, len(signature)+1)
+	copy(signatureWithV, signature)
+	signatureWithV[len(signature)] = byte(recoveryID)
+
 	msg := Message{
 		Type:       "result",
-		Payload:    base64.StdEncoding.EncodeToString(signature),
+		Payload:    base64.StdEncoding.EncodeToString(signatureWithV),
 		PartyIndex: partyIndex,
 	}
 	data, _ := json.Marshal(msg)