diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..71d8518
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,6 @@
+MERKLE_TREE_HEIGHT=16
+# in wei
+AMOUNT=1000000000000000000
+EMPTY_ELEMENT=1337
+PRIVATE_KEY=
+
diff --git a/README.md b/README.md
index 5e319fa..4e71966 100644
--- a/README.md
+++ b/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:
-
-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, .....
+## Deploy
+1. `npx truffle migrate --network kovan --reset`
+
 
 
diff --git a/contracts/Mixer.sol b/contracts/Mixer.sol
index 6c010aa..e8b0749 100644
--- a/contracts/Mixer.sol
+++ b/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;
   }
diff --git a/contracts/Verifier.sol b/contracts/Verifier.sol
new file mode 120000
index 0000000..c75a663
--- /dev/null
+++ b/contracts/Verifier.sol
@@ -0,0 +1 @@
+../build/circuits/Verifier.sol
\ No newline at end of file
diff --git a/migrations/3_deploy_verifier.js b/migrations/3_deploy_verifier.js
new file mode 100644
index 0000000..235901b
--- /dev/null
+++ b/migrations/3_deploy_verifier.js
@@ -0,0 +1,6 @@
+require('dotenv').config()
+const Verifier = artifacts.require("Verifier");
+
+module.exports = function(deployer) {
+  deployer.deploy(Verifier);
+};
diff --git a/migrations/4_deploy_mixer.js b/migrations/4_deploy_mixer.js
new file mode 100644
index 0000000..a1af47e
--- /dev/null
+++ b/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)
+  })
+};
diff --git a/package-lock.json b/package-lock.json
index a694634..a1510e5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -43,6 +43,15 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.12.tgz",
       "integrity": "sha512-QcAKpaO6nhHLlxWBvpc4WeLrTvPqlHOvaj0s5GriKkA1zq+bsFBPpfYCvQhLqLgYlIko8A9YrPdaMHCo5mBcpg=="
     },
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
     "acorn": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.0.tgz",
@@ -108,6 +117,11 @@
       "resolved": "https://registry.npmjs.org/ansi-wrap/-/ansi-wrap-0.1.0.tgz",
       "integrity": "sha1-qCJQ3bABXponyoLoLqYDu/pF768="
     },
+    "any-promise": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
+      "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8="
+    },
     "anymatch": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
@@ -179,6 +193,11 @@
       "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
       "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8="
     },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
+    },
     "array-initial": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/array-initial/-/array-initial-1.1.0.tgz",
@@ -237,6 +256,29 @@
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg="
     },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
+    },
+    "asn1.js": {
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
+      "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
+      "requires": {
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0"
+      }
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
+    },
     "assertion-error": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
@@ -268,6 +310,11 @@
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       "integrity": "sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ=="
     },
+    "async-limiter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
+      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg=="
+    },
     "async-settle": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/async-settle/-/async-settle-1.0.0.tgz",
@@ -276,11 +323,26 @@
         "async-done": "^1.2.2"
       }
     },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
+    },
     "atob": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
       "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg=="
     },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
+    },
+    "aws4": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
+      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ=="
+    },
     "bach": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/bach/-/bach-1.2.0.tgz",
@@ -352,6 +414,19 @@
         }
       }
     },
+    "base64-js": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.0.tgz",
+      "integrity": "sha512-ccav/yGvoa80BQDljCxsmmQ3Xvx60/UpBIij5QN21W3wBi/hhIC9OoO+KLpu9IJTS9j4DRVJ3aDDF9cMSoa2lw=="
+    },
+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "requires": {
+        "tweetnacl": "^0.14.3"
+      }
+    },
     "big-integer": {
       "version": "1.6.44",
       "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.44.tgz",
@@ -378,6 +453,15 @@
         "safe-buffer": "^5.0.1"
       }
     },
+    "bl": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
+      "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
+      "requires": {
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
+      }
+    },
     "blake-hash": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/blake-hash/-/blake-hash-1.1.0.tgz",
@@ -388,6 +472,19 @@
         "nan": "^2.2.1"
       }
     },
+    "block-stream": {
+      "version": "0.0.9",
+      "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
+      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
+      "requires": {
+        "inherits": "~2.0.0"
+      }
+    },
+    "bluebird": {
+      "version": "3.5.5",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.5.tgz",
+      "integrity": "sha512-5am6HnnfN+urzt4yfg7IgTbotDjIT/u8AJpEt0sIU9FtXfVeezXAPKswrG+xKUCOYAINpSdgZVDU6QFh+cuH3w=="
+    },
     "bn-chai": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/bn-chai/-/bn-chai-1.0.1.tgz",
@@ -398,6 +495,38 @@
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     },
+    "body-parser": {
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
+      "requires": {
+        "bytes": "3.1.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+        }
+      }
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -478,11 +607,83 @@
         "safe-buffer": "^5.1.2"
       }
     },
+    "browserify-rsa": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz",
+      "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=",
+      "requires": {
+        "bn.js": "^4.1.0",
+        "randombytes": "^2.0.1"
+      }
+    },
+    "browserify-sha3": {
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+      "resolved": "https://registry.npmjs.org/browserify-sha3/-/browserify-sha3-0.0.4.tgz",
+      "integrity": "sha1-CGxHuMgjFsnUcCLCYYWVRXbdjiY=",
+      "requires": {
+        "js-sha3": "^0.6.1",
+        "safe-buffer": "^5.1.1"
+      },
+      "dependencies": {
+        "js-sha3": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/js-sha3/-/js-sha3-0.6.1.tgz",
+          "integrity": "sha1-W4n3enR3Z5h39YxKB1JAk0sflcA="
+        }
+      }
+    },
+    "browserify-sign": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.0.4.tgz",
+      "integrity": "sha1-qk62jl17ZYuqa/alfmMMvXqT0pg=",
+      "requires": {
+        "bn.js": "^4.1.1",
+        "browserify-rsa": "^4.0.0",
+        "create-hash": "^1.1.0",
+        "create-hmac": "^1.1.2",
+        "elliptic": "^6.0.0",
+        "inherits": "^2.0.1",
+        "parse-asn1": "^5.0.0"
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+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.2.1.tgz",
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+      "requires": {
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+        "buffer-fill": "^1.0.0"
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+    },
+    "buffer-crc32": {
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+      "resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-0.2.13.tgz",
+      "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI="
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     "buffer-equal": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/buffer-equal/-/buffer-equal-1.0.0.tgz",
       "integrity": "sha1-WWFrSYME1Var1GaWayLu2j7KX74="
     },
+    "buffer-fill": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
+      "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw="
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       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
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       "integrity": "sha1-JuYe0UIvtw3ULm42cp7VHYVf6Nk="
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+    "bytes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
+      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
+    },
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@@ -524,6 +730,11 @@
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     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
+    },
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       "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
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     },
+    "combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
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+      "requires": {
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       "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
@@ -771,6 +990,26 @@
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       }
     },
+    "content-disposition": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
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+        }
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@@ -786,6 +1025,16 @@
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       }
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+    "cookie": {
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+            "elliptic": "^6.4.0",
+            "keccakjs": "^0.2.1",
+            "nano-json-stream-parser": "^0.1.2",
+            "servify": "^0.1.12",
+            "ws": "^3.0.0",
+            "xhr-request-promise": "^0.1.2"
+          }
+        },
+        "web3-core-helpers": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-core-helpers/-/web3-core-helpers-1.0.0-beta.37.tgz",
+          "integrity": "sha512-efaLOzN28RMnbugnyelgLwPWWaSwElQzcAJ/x3PZu+uPloM/lE5x0YuBKvIh7/PoSMlHqtRWj1B8CpuQOUQ5Ew==",
+          "requires": {
+            "underscore": "1.8.3",
+            "web3-eth-iban": "1.0.0-beta.37",
+            "web3-utils": "1.0.0-beta.37"
+          }
+        },
+        "web3-eth-iban": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-eth-iban/-/web3-eth-iban-1.0.0-beta.37.tgz",
+          "integrity": "sha512-WQRniGJFxH/XCbd7miO6+jnUG+6bvuzfeufPIiOtCbeIC1ypp1kSqER8YVBDrTyinU1xnf1U5v0KBZ2yiWBJxQ==",
+          "requires": {
+            "bn.js": "4.11.6",
+            "web3-utils": "1.0.0-beta.37"
+          }
+        },
+        "web3-utils": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.0.0-beta.37.tgz",
+          "integrity": "sha512-kA1fyhO8nKgU21wi30oJQ/ssvu+9srMdjOTKbHYbQe4ATPcr5YNwwrxG3Bcpbu1bEwRUVKHCkqi+wTvcAWBdlQ==",
+          "requires": {
+            "bn.js": "4.11.6",
+            "eth-lib": "0.1.27",
+            "ethjs-unit": "0.1.6",
+            "number-to-bn": "1.7.0",
+            "randomhex": "0.1.5",
+            "underscore": "1.8.3",
+            "utf8": "2.1.1"
+          }
+        }
+      }
+    },
+    "web3-providers-ipc": {
+      "version": "1.0.0-beta.37",
+      "resolved": "https://registry.npmjs.org/web3-providers-ipc/-/web3-providers-ipc-1.0.0-beta.37.tgz",
+      "integrity": "sha512-NdRPRxYMIU0C3u18NI8u4bwbhI9pCg5nRgDGYcmSAx5uOBxiYcQy+hb0WkJRRhBoyIXJmy+s26FoH8904+UnPg==",
+      "requires": {
+        "oboe": "2.1.3",
+        "underscore": "1.8.3",
+        "web3-core-helpers": "1.0.0-beta.37"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.11.6",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
+          "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
+        },
+        "eth-lib": {
+          "version": "0.1.27",
+          "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.1.27.tgz",
+          "integrity": "sha512-B8czsfkJYzn2UIEMwjc7Mbj+Cy72V+/OXH/tb44LV8jhrjizQJJ325xMOMyk3+ETa6r6oi0jsUY14+om8mQMWA==",
+          "requires": {
+            "bn.js": "^4.11.6",
+            "elliptic": "^6.4.0",
+            "keccakjs": "^0.2.1",
+            "nano-json-stream-parser": "^0.1.2",
+            "servify": "^0.1.12",
+            "ws": "^3.0.0",
+            "xhr-request-promise": "^0.1.2"
+          }
+        },
+        "web3-core-helpers": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-core-helpers/-/web3-core-helpers-1.0.0-beta.37.tgz",
+          "integrity": "sha512-efaLOzN28RMnbugnyelgLwPWWaSwElQzcAJ/x3PZu+uPloM/lE5x0YuBKvIh7/PoSMlHqtRWj1B8CpuQOUQ5Ew==",
+          "requires": {
+            "underscore": "1.8.3",
+            "web3-eth-iban": "1.0.0-beta.37",
+            "web3-utils": "1.0.0-beta.37"
+          }
+        },
+        "web3-eth-iban": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-eth-iban/-/web3-eth-iban-1.0.0-beta.37.tgz",
+          "integrity": "sha512-WQRniGJFxH/XCbd7miO6+jnUG+6bvuzfeufPIiOtCbeIC1ypp1kSqER8YVBDrTyinU1xnf1U5v0KBZ2yiWBJxQ==",
+          "requires": {
+            "bn.js": "4.11.6",
+            "web3-utils": "1.0.0-beta.37"
+          }
+        },
+        "web3-utils": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.0.0-beta.37.tgz",
+          "integrity": "sha512-kA1fyhO8nKgU21wi30oJQ/ssvu+9srMdjOTKbHYbQe4ATPcr5YNwwrxG3Bcpbu1bEwRUVKHCkqi+wTvcAWBdlQ==",
+          "requires": {
+            "bn.js": "4.11.6",
+            "eth-lib": "0.1.27",
+            "ethjs-unit": "0.1.6",
+            "number-to-bn": "1.7.0",
+            "randomhex": "0.1.5",
+            "underscore": "1.8.3",
+            "utf8": "2.1.1"
+          }
+        }
+      }
+    },
+    "web3-providers-ws": {
+      "version": "1.0.0-beta.37",
+      "resolved": "https://registry.npmjs.org/web3-providers-ws/-/web3-providers-ws-1.0.0-beta.37.tgz",
+      "integrity": "sha512-8p6ZLv+1JYa5Vs8oBn33Nn3VGFBbF+wVfO+b78RJS1Qf1uIOzjFVDk3XwYDD7rlz9G5BKpxhaQw+6EGQ7L02aw==",
+      "requires": {
+        "underscore": "1.8.3",
+        "web3-core-helpers": "1.0.0-beta.37",
+        "websocket": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.11.6",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.6.tgz",
+          "integrity": "sha1-UzRK2xRhehP26N0s4okF0cC6MhU="
+        },
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "eth-lib": {
+          "version": "0.1.27",
+          "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.1.27.tgz",
+          "integrity": "sha512-B8czsfkJYzn2UIEMwjc7Mbj+Cy72V+/OXH/tb44LV8jhrjizQJJ325xMOMyk3+ETa6r6oi0jsUY14+om8mQMWA==",
+          "requires": {
+            "bn.js": "^4.11.6",
+            "elliptic": "^6.4.0",
+            "keccakjs": "^0.2.1",
+            "nano-json-stream-parser": "^0.1.2",
+            "servify": "^0.1.12",
+            "ws": "^3.0.0",
+            "xhr-request-promise": "^0.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+        },
+        "web3-core-helpers": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-core-helpers/-/web3-core-helpers-1.0.0-beta.37.tgz",
+          "integrity": "sha512-efaLOzN28RMnbugnyelgLwPWWaSwElQzcAJ/x3PZu+uPloM/lE5x0YuBKvIh7/PoSMlHqtRWj1B8CpuQOUQ5Ew==",
+          "requires": {
+            "underscore": "1.8.3",
+            "web3-eth-iban": "1.0.0-beta.37",
+            "web3-utils": "1.0.0-beta.37"
+          }
+        },
+        "web3-eth-iban": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-eth-iban/-/web3-eth-iban-1.0.0-beta.37.tgz",
+          "integrity": "sha512-WQRniGJFxH/XCbd7miO6+jnUG+6bvuzfeufPIiOtCbeIC1ypp1kSqER8YVBDrTyinU1xnf1U5v0KBZ2yiWBJxQ==",
+          "requires": {
+            "bn.js": "4.11.6",
+            "web3-utils": "1.0.0-beta.37"
+          }
+        },
+        "web3-utils": {
+          "version": "1.0.0-beta.37",
+          "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.0.0-beta.37.tgz",
+          "integrity": "sha512-kA1fyhO8nKgU21wi30oJQ/ssvu+9srMdjOTKbHYbQe4ATPcr5YNwwrxG3Bcpbu1bEwRUVKHCkqi+wTvcAWBdlQ==",
+          "requires": {
+            "bn.js": "4.11.6",
+            "eth-lib": "0.1.27",
+            "ethjs-unit": "0.1.6",
+            "number-to-bn": "1.7.0",
+            "randomhex": "0.1.5",
+            "underscore": "1.8.3",
+            "utf8": "2.1.1"
+          }
+        },
+        "websocket": {
+          "version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
+          "from": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible",
+          "requires": {
+            "debug": "^2.2.0",
+            "nan": "^2.3.3",
+            "typedarray-to-buffer": "^3.1.2",
+            "yaeti": "^0.0.6"
+          }
+        }
+      }
+    },
     "web3-shh": {
       "version": "1.0.0-beta.55",
       "resolved": "https://registry.npmjs.org/web3-shh/-/web3-shh-1.0.0-beta.55.tgz",
@@ -5667,6 +7685,23 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "ws": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
+      "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
+      "requires": {
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        }
+      }
+    },
     "xhr": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/xhr/-/xhr-2.5.0.tgz",
@@ -5755,6 +7790,15 @@
         "camelcase": "^5.0.0",
         "decamelize": "^1.2.0"
       }
+    },
+    "yauzl": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+      "requires": {
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index ad9d783..7b47114 100644
--- a/package.json
+++ b/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"
   }
 }
diff --git a/test/Mixer.test.js b/test/Mixer.test.js
new file mode 100644
index 0000000..3c330e1
--- /dev/null
+++ b/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()
+  })
+})
diff --git a/truffle-config.js b/truffle-config.js
index 0428092..5b239cb 100644
--- a/truffle-config.js
+++ b/truffle-config.js
@@ -1,24 +1,6 @@
-/**
- * Use this file to configure your truffle project. It's seeded with some
- * common settings for different networks and features like migrations,
- * 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');
+require('dotenv').config()
+const HDWalletProvider = require('truffle-hdwallet-provider');
+const utils = require('web3-utils')
 // 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: {
-      // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
-      // network_id: 3,       // Ropsten's id
-      // gas: 5500000,        // Ropsten has a lower block limit than mainnet
-      // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
-      // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
-      // skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
-    // },
+    kovan: {
+      provider: () => new HDWalletProvider(process.env.PRIVATE_KEY, 'https://kovan.infura.io/v3/c7463beadf2144e68646ff049917b716'),
+      network_id: 42,
+      gas: 7000000,
+      gasPrice: utils.toWei('1', 'gwei'),
+      // confirmations: 0,
+      // timeoutBlocks: 200,
+      skipDryRun: true
+    },
 
     // Useful for private networks
     // private: {