diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 0000000..b4de394
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+11
diff --git a/test/Mixer.test.js b/test/Mixer.test.js
index feaf81e..61585e0 100644
--- a/test/Mixer.test.js
+++ b/test/Mixer.test.js
@@ -127,6 +127,7 @@ contract('Mixer', accounts => {
 
       const input = stringifyBigInts({
         root,
+        nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(32)),
         nullifier: deposit.nullifier,
         receiver,
         fee,
@@ -179,16 +180,18 @@ contract('Mixer', accounts => {
       const input = stringifyBigInts({
         // public
         root,
-        nullifier: deposit.nullifier,
+        nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(32)),
         receiver,
         fee,
 
         // private
+        nullifier: deposit.nullifier,
         secret: deposit.secret,
         pathElements: path_elements,
         pathIndex: path_index,
       })
 
+
       const proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
       const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
 
@@ -207,7 +210,7 @@ contract('Mixer', accounts => {
       balanceRecieverAfter.should.be.eq.BN(toBN(balanceRecieverBefore).add(toBN(value)).sub(feeBN))
 
       logs[0].event.should.be.equal('Withdraw')
-      logs[0].args.nullifier.should.be.eq.BN(toBN(deposit.nullifier.toString()))
+      logs[0].args.nullifier.should.be.eq.BN(toBN(input.nullifierHash.toString()))
       logs[0].args.fee.should.be.eq.BN(feeBN)
     })
 
@@ -220,6 +223,7 @@ contract('Mixer', accounts => {
 
       const input = stringifyBigInts({
         root,
+        nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(32)),
         nullifier: deposit.nullifier,
         receiver,
         fee,
@@ -244,6 +248,7 @@ contract('Mixer', accounts => {
       const oneEtherFee = bigInt(1e18) // 1 ether
       const input = stringifyBigInts({
         root,
+        nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(32)),
         nullifier: deposit.nullifier,
         receiver,
         fee: oneEtherFee,
@@ -266,6 +271,7 @@ contract('Mixer', accounts => {
       const { root, path_elements, path_index } = await tree.path(0)
 
       const input = stringifyBigInts({
+        nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(32)),
         root,
         nullifier: deposit.nullifier,
         receiver,
@@ -293,6 +299,7 @@ contract('Mixer', accounts => {
 
       const input = stringifyBigInts({
         root,
+        nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(32)),
         nullifier: deposit.nullifier,
         receiver,
         fee,