diff --git a/wallet/nockhash.go b/wallet/nockhash.go
index 1d45183..db71001 100644
--- a/wallet/nockhash.go
+++ b/wallet/nockhash.go
@@ -213,9 +213,9 @@ func HashSpend(spend *nockchain.NockchainSpend) ([5]uint64, error) {
 		return [5]uint64{}, err
 	}
 	finalSeedHash = crypto.Tip5RehashTenCell(finalSeedHash, crypto.Tip5ZeroZero)
-	finalSeedHash = crypto.Tip5RehashTenCell(finalSeedHash, crypto.Tip5Zero)
 
 	if seedsCount != 1 {
+		finalSeedHash = crypto.Tip5RehashTenCell(finalSeedHash, crypto.Tip5Zero)
 		for i := 1; i < seedsCount; i++ {
 			seedHash, err := HashSeedWithoutSource(spend.Seeds[seedsCount-1-i])
 			if err != nil {
@@ -238,9 +238,9 @@ func HashMsg(spend *nockchain.NockchainSpend) ([5]uint64, error) {
 		return [5]uint64{}, err
 	}
 	finalSeedHash = crypto.Tip5RehashTenCell(finalSeedHash, crypto.Tip5ZeroZero)
-	finalSeedHash = crypto.Tip5RehashTenCell(finalSeedHash, crypto.Tip5Zero)
 
 	if seedsCount != 1 {
+		finalSeedHash = crypto.Tip5RehashTenCell(finalSeedHash, crypto.Tip5Zero)
 		for i := 1; i < seedsCount; i++ {
 			seedHash, err := HashSeed(spend.Seeds[seedsCount-1-i])
 			if err != nil {