mixer deploy WIP

.env.example

@@ -0,0 +1,6 @@
+MERKLE_TREE_HEIGHT=16
+# in wei
+AMOUNT=1000000000000000000
+EMPTY_ELEMENT=1337
+PRIVATE_KEY=
+

README.md

@@ -1,11 +1,11 @@
 ## Testing
 1. `npm i`
+2. `npm run build:circuit`
 2. `npx truffle compile`
 3. `npx truffle test` - it may fail for the first time, just run one more time.
 
-Short version:
+## Deploy
-
+1. `npx truffle migrate --network kovan --reset`
-We have a merkle tree of deposit commitments `Pedersen(secret + nullifier)`, merkle tree uses MiMC
+
-On withdrawal a SNARK proof verifies merkle proof and leaf preimage, .....
 
 

contracts/Mixer.sol

@@ -19,7 +19,12 @@ contract Mixer is MerkleTreeWithHistory {
     @param _verifier the address of SNARK verifier for this contract
     @param _transferValue the value for all deposits in this contract in wei
   */
-  constructor(address _verifier, uint256 _transferValue) MerkleTreeWithHistory(16, 0) public {
+  constructor(
+    address _verifier,
+    uint256 _transferValue,
+    uint8 _merkleTreeHeight,
+    uint256 _emptyElement
+  ) MerkleTreeWithHistory(_merkleTreeHeight, _emptyElement) public {
     verifier = IVerifier(_verifier);
     transferValue = _transferValue;
   }

contracts/Verifier.sol

@@ -0,0 +1 @@
+../build/circuits/Verifier.sol

migrations/3_deploy_verifier.js

@@ -0,0 +1,6 @@
+require('dotenv').config()
+const Verifier = artifacts.require("Verifier");
+
+module.exports = function(deployer) {
+  deployer.deploy(Verifier);
+};

migrations/4_deploy_mixer.js

@@ -0,0 +1,15 @@
+require('dotenv').config({ path: '../.env' })
+const Mixer = artifacts.require("Mixer");
+const Verifier = artifacts.require("Verifier");
+const MiMC = artifacts.require("MiMC");
+
+
+module.exports = function(deployer) {
+  return deployer.then(async () => {
+    const { MERKLE_TREE_HEIGHT, AMOUNT, EMPTY_ELEMENT } = process.env
+    const verifier = await Verifier.deployed()
+    const miMC = MiMC.deployed()
+    await Mixer.link(MiMC, miMC.address)
+    await deployer.deploy(Mixer, verifier.address, AMOUNT, MERKLE_TREE_HEIGHT, EMPTY_ELEMENT)
+  })
+};

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "build:circuit:compile": "circom circuits/withdraw.circom -o build/circuits/withdraw.json && snarkjs info -c build/circuits/withdraw.json",
     "build:circuit:setup": "snarkjs setup --protocol groth -c build/circuits/withdraw.json --pk build/circuits/withdraw_proving_key.json --vk build/circuits/withdraw_verification_key.json",
-    "build:circuit:contract": "snarkjs generateverifier -v build/circuits/withdraw_verifier.sol --vk build/circuits/withdraw_verification_key.json",
+    "build:circuit:contract": "snarkjs generateverifier -v build/circuits/Verifier.sol --vk build/circuits/withdraw_verification_key.json",
     "build:circuit": "mkdir -p build/circuits && npm run build:circuit:compile && npm run build:circuit:setup && npm run build:circuit:contract",
     "build:contract": "truffle compile",
     "test": "echo \"Error: no test specified\" && exit 1"
@@ -15,16 +15,18 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "circom": "0.0.30",
-    "snarkjs": "^0.1.14",
-    "websnark": "0.0.4",
     "bn-chai": "^1.0.1",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
+    "circom": "0.0.30",
     "circomlib": "git+https://github.com/kobigurk/circomlib.git#323966c0584bafebf9652681c44d9ea348fe9bb5",
+    "dotenv": "^8.0.0",
     "ganache-cli": "^6.4.5",
+    "snarkjs": "^0.1.14",
     "truffle": "^5.0.20",
     "truffle-artifactor": "^4.0.22",
-    "web3-utils": "^1.0.0-beta.55"
+    "truffle-hdwallet-provider": "^1.0.14",
+    "web3-utils": "^1.0.0-beta.55",
+    "websnark": "0.0.4"
   }
 }

test/Mixer.test.js

@@ -0,0 +1,41 @@
+const should = require('chai')
+  .use(require('bn-chai')(web3.utils.BN))
+  .use(require('chai-as-promised'))
+.should()
+
+const { toWei, toBN, fromWei } = require('web3-utils')
+const { takeSnapshot, revertSnapshot, increaseTime } = require('../scripts/ganacheHelper');
+
+const Mixer = artifacts.require('./Mixer.sol')
+
+
+contract('Mixer', async accounts => {
+  let mixer
+  let miMC
+  const sender = accounts[0]
+  const emptyAddress = '0x0000000000000000000000000000000000000000'
+  const levels = 16
+  const zeroValue = 1337
+  let snapshotId
+  let prefix = 'test'
+  let tree
+  let hasher
+
+  before(async () => {
+    mixer = await Mixer.deployed()
+    snapshotId = await takeSnapshot()
+  })
+
+  describe('#constuctor', async () => {
+    it('should initialize', async () => {
+      const { AMOUNT } = process.env
+      const transferValue = await mixer.transferValue()
+      transferValue.should.be.eq.BN(toBN(AMOUNT))
+    })
+  })
+
+  afterEach(async () => {
+    await revertSnapshot(snapshotId.result)
+    snapshotId = await takeSnapshot()
+  })
+})

truffle-config.js

@@ -1,24 +1,6 @@
-/**
+require('dotenv').config()
- * Use this file to configure your truffle project. It's seeded with some
+const HDWalletProvider = require('truffle-hdwallet-provider');
- * common settings for different networks and features like migrations,
+const utils = require('web3-utils')
- * compilation and testing. Uncomment the ones you need or modify
- * them to suit your project as necessary.
- *
- * More information about configuration can be found at:
- *
- * truffleframework.com/docs/advanced/configuration
- *
- * To deploy via Infura you'll need a wallet provider (like truffle-hdwallet-provider)
- * to sign your transactions before they're sent to a remote public node. Infura accounts
- * are available for free at: infura.io/register.
- *
- * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
- * public/private key pairs. If you're publishing your code to GitHub make sure you load this
- * phrase from a file you've .gitignored so it doesn't accidentally become public.
- *
- */
-
-// const HDWalletProvider = require('truffle-hdwallet-provider');
 // const infuraKey = "fj4jll3k.....";
 //
 // const fs = require('fs');
@@ -60,14 +42,15 @@ module.exports = {
 
     // Useful for deploying to a public network.
     // NB: It's important to wrap the provider as a function.
-    // ropsten: {
+    kovan: {
-      // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
+      provider: () => new HDWalletProvider(process.env.PRIVATE_KEY, 'https://kovan.infura.io/v3/c7463beadf2144e68646ff049917b716'),
-      // network_id: 3,       // Ropsten's id
+      network_id: 42,
-      // gas: 5500000,        // Ropsten has a lower block limit than mainnet
+      gas: 7000000,
-      // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
+      gasPrice: utils.toWei('1', 'gwei'),
-      // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
+      // confirmations: 0,
-      // skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
+      // timeoutBlocks: 200,
-    // },
+      skipDryRun: true
+    },
 
     // Useful for private networks
     // private: {