1 files changed, 14 insertions, 9 deletions
diff --git a/core/types/transaction.go b/core/types/transaction.go
index 9c6e77be9..7b53cac2c 100644
--- a/core/types/transaction.go
+++ b/core/types/transaction.go
@@ -153,16 +153,21 @@ func (tx *Transaction) UnmarshalJSON(input []byte) error {
 	if err := dec.UnmarshalJSON(input); err != nil {
 		return err
 	}
-	var V byte
-	if isProtectedV(dec.V) {
-		chainID := deriveChainId(dec.V).Uint64()
-		V = byte(dec.V.Uint64() - 35 - 2*chainID)
-	} else {
-		V = byte(dec.V.Uint64() - 27)
-	}
-	if !crypto.ValidateSignatureValues(V, dec.R, dec.S, false) {
-		return ErrInvalidSig
+
+	withSignature := dec.V.Sign() != 0 || dec.R.Sign() != 0 || dec.S.Sign() != 0
+	if withSignature {
+		var V byte
+		if isProtectedV(dec.V) {
+			chainID := deriveChainId(dec.V).Uint64()
+			V = byte(dec.V.Uint64() - 35 - 2*chainID)
+		} else {
+			V = byte(dec.V.Uint64() - 27)
+		}
+		if !crypto.ValidateSignatureValues(V, dec.R, dec.S, false) {
+			return ErrInvalidSig
+		}
 	}
+
 	*tx = Transaction{data: dec}
 	return nil
 }