diff --git a/README.md b/README.md
index cedb146..7963d04 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ Mainstay is accompanied by a Confirmation tool that can be run in parallel with
 
 
 - Unit Testing
-    - `/$GOPATH/src/mainstay/run-tests.sh`
+    - `/$GOPATH/src/mainstay/scripts/run-tests.sh`
 
 ## Tools
 
diff --git a/attestation/attestclient.go b/attestation/attestclient.go
index 3ce7161..afda9a9 100644
--- a/attestation/attestclient.go
+++ b/attestation/attestclient.go
@@ -366,7 +366,8 @@ func (w *AttestClient) createAttestation(paytoaddr btcutil.Address, unspent []bt
 	msgTx.TxIn[0].Sequence = uint32(math.Pow(2, float64(32))) - 3
 
 	// return error if txout value is less than maxFee target
-	maxFee := calcSignedTxFee(w.Fees.maxFee, msgTx.SerializeSize(), len(w.script0)/2, w.numOfSigs)
+	maxFee := calcSignedTxFee(w.Fees.maxFee, msgTx.SerializeSize(),
+		len(inputs)*len(w.script0)/2, len(inputs)*w.numOfSigs)
 	if msgTx.TxOut[0].Value < maxFee {
 		return nil, errors.New(ErrorInsufficientFunds)
 	}
@@ -378,7 +379,8 @@ func (w *AttestClient) createAttestation(paytoaddr btcutil.Address, unspent []bt
 
 	// add fees using best fee-per-byte estimate
 	feePerByte := w.Fees.GetFee()
-	fee := calcSignedTxFee(feePerByte, msgTx.SerializeSize(), len(w.script0)/2, w.numOfSigs)
+	fee := calcSignedTxFee(feePerByte, msgTx.SerializeSize(),
+		len(inputs)*len(w.script0)/2, len(inputs)*w.numOfSigs)
 	msgTx.TxOut[0].Value -= fee
 
 	return msgTx, nil
@@ -400,7 +402,8 @@ func (w *AttestClient) bumpAttestationFees(msgTx *wire.MsgTx) error {
 	feePerByteIncrement := w.Fees.GetFee() - prevFeePerByte
 
 	// increase tx fees by fee difference
-	feeIncrement := calcSignedTxFee(feePerByteIncrement, msgTx.SerializeSize(), len(w.script0)/2, w.numOfSigs)
+	feeIncrement := calcSignedTxFee(feePerByteIncrement, msgTx.SerializeSize(),
+		len(msgTx.TxIn)*len(w.script0)/2, len(msgTx.TxIn)*w.numOfSigs)
 	msgTx.TxOut[0].Value -= feeIncrement
 
 	return nil
diff --git a/attestation/attestclient_test.go b/attestation/attestclient_test.go
index 92c4caf..741d0e9 100644
--- a/attestation/attestclient_test.go
+++ b/attestation/attestclient_test.go
@@ -527,8 +527,10 @@ func TestAttestClient_FeeBumping(t *testing.T) {
 
 		newFee := client.Fees.GetFee()
 		newValue := tx2.TxOut[0].Value
-		newTxFee := calcSignedTxFee(newFee, tx2.SerializeSize(), len(client.script0)/2, client.numOfSigs)
-		currentTxFee := calcSignedTxFee(currentFee, tx.SerializeSize(), len(client.script0)/2, client.numOfSigs)
+		newTxFee := calcSignedTxFee(newFee, tx2.SerializeSize(),
+			len(tx2.TxIn)*len(client.script0)/2, len(tx2.TxIn)*client.numOfSigs)
+		currentTxFee := calcSignedTxFee(currentFee, tx.SerializeSize(),
+			len(tx.TxIn)*len(client.script0)/2, len(tx.TxIn)*client.numOfSigs)
 		assert.Equal(t, newTxFee-currentTxFee, currentValue+topupValue-newValue)
 		assert.Equal(t, client.Fees.minFee+client.Fees.feeIncrement, newFee)