diff --git a/cmd/kaspawallet/daemon/server/create_unsigned_transaction.go b/cmd/kaspawallet/daemon/server/create_unsigned_transaction.go
index cd44205b34..00666347b4 100644
--- a/cmd/kaspawallet/daemon/server/create_unsigned_transaction.go
+++ b/cmd/kaspawallet/daemon/server/create_unsigned_transaction.go
@@ -200,7 +200,7 @@ func (s *server) selectUTXOsWithPreselected(preSelectedUTXOs []*walletUTXO, allo
 		if isSendAll {
 			estimatedRecipientValue = totalValue
 		}
-		
+
 		fee, err = s.estimateFee(selectedUTXOs, feeRate, maxFee, estimatedRecipientValue)
 		if err != nil {
 			return false, err
@@ -261,8 +261,8 @@ func (s *server) selectUTXOsWithPreselected(preSelectedUTXOs []*walletUTXO, allo
 }
 
 func (s *server) estimateFee(selectedUTXOs []*libkaspawallet.UTXO, feeRate float64, maxFee uint64, recipientValue uint64) (uint64, error) {
-	fakePubKey := [util.PublicKeySize]byte{}
-	fakeAddr, err := util.NewAddressPublicKey(fakePubKey[:], s.params.Prefix)
+	fakePubKey := [util.PublicKeySizeECDSA]byte{}
+	fakeAddr, err := util.NewAddressPublicKeyECDSA(fakePubKey[:], s.params.Prefix) // We assume the worst case where the recipient address is ECDSA. In this case the scriptPubKey will be the longest.
 	if err != nil {
 		return 0, err
 	}
diff --git a/version/version.go b/version/version.go
index e3122c68fc..abcb183d9d 100644
--- a/version/version.go
+++ b/version/version.go
@@ -17,7 +17,7 @@ const (
 // appBuild is defined as a variable so it can be overridden during the build
 // process with '-ldflags "-X github.com/kaspanet/kaspad/version.appBuild=foo"' if needed.
 // It MUST only contain characters from validCharacters.
-var appBuild string = "rc6"
+var appBuild string = "rc7"
 
 var version = "" // string used for memoization of version