diff --git a/migrations/2_deploy_hasher.js b/migrations/2_deploy_hasher.js
index da44127..efb9ae5 100644
--- a/migrations/2_deploy_hasher.js
+++ b/migrations/2_deploy_hasher.js
@@ -2,7 +2,7 @@
 const path = require('path')
 
 const genContract = require('circomlib/src/mimcsponge_gencontract.js')
-const Artifactor = require('truffle-artifactor')
+const Artifactor = require('@truffle/artifactor')
 
 module.exports = function(deployer) {
   return deployer.then( async () =>  {
diff --git a/package-lock.json b/package-lock.json
index 15250c9..82ffa6f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,9 +5,9 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
-      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
       "requires": {
         "@babel/highlight": "^7.0.0"
       }
@@ -20,26 +20,50 @@
         "chalk": "^2.0.0",
         "esutils": "^2.0.2",
         "js-tokens": "^4.0.0"
-      }
-    },
-    "@babel/runtime": {
-      "version": "7.5.4",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.5.4.tgz",
-      "integrity": "sha512-Na84uwyImZZc3FKf4aUF1tysApzwf3p2yuFBIyBfbzT5glzKTdvYI4KVW4kcgjrzoGUjC7w3YyCHcJKaRxsr2Q==",
-      "requires": {
-        "regenerator-runtime": "^0.13.2"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
+        },
+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          }
+        },
+        "js-tokens": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
+          "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ=="
+        },
+        "supports-color": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        }
       }
     },
     "@openzeppelin/contracts": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.3.0.tgz",
-      "integrity": "sha512-lf8C3oULQAnsu3OTRP4tP5/ddfil6l65Lg3JQCwAIgc99vZ1jz5qeBoETGGGmczxt+bIyMI06WPP2apC74EZag=="
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/@openzeppelin/contracts/-/contracts-2.4.0.tgz",
+      "integrity": "sha512-xeKP59REgow5TPBJh3S9BRIm7DDG+Rz3Nt4ANWGUkjk4305DHpyUD5CyMJ6nd2JMmZuFyx4mjvvlCtSJLRnN6w=="
     },
     "@resolver-engine/core": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/@resolver-engine/core/-/core-0.2.1.tgz",
       "integrity": "sha512-nsLQHmPJ77QuifqsIvqjaF5B9aHnDzJjp73Q1z6apY3e9nqYrx4Dtowhpsf7Jwftg/XzVDEMQC+OzUBNTS+S1A==",
-      "dev": true,
       "requires": {
         "debug": "^3.1.0",
         "request": "^2.85.0"
@@ -49,7 +73,6 @@
           "version": "3.2.6",
           "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
           "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
-          "dev": true,
           "requires": {
             "ms": "^2.1.1"
           }
@@ -60,7 +83,6 @@
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/@resolver-engine/fs/-/fs-0.2.1.tgz",
       "integrity": "sha512-7kJInM1Qo2LJcKyDhuYzh9ZWd+mal/fynfL9BNjWOiTcOpX+jNfqb/UmGUqros5pceBITlWGqS4lU709yHFUbg==",
-      "dev": true,
       "requires": {
         "@resolver-engine/core": "^0.2.1",
         "debug": "^3.1.0"
@@ -70,7 +92,6 @@
           "version": "3.2.6",
           "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
           "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
-          "dev": true,
           "requires": {
             "ms": "^2.1.1"
           }
@@ -81,7 +102,6 @@
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/@resolver-engine/imports/-/imports-0.2.2.tgz",
       "integrity": "sha512-u5/HUkvo8q34AA+hnxxqqXGfby5swnH0Myw91o3Sm2TETJlNKXibFGSKBavAH+wvWdBi4Z5gS2Odu0PowgVOUg==",
-      "dev": true,
       "requires": {
         "@resolver-engine/core": "^0.2.1",
         "debug": "^3.1.0",
@@ -92,7 +112,6 @@
           "version": "3.2.6",
           "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
           "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
-          "dev": true,
           "requires": {
             "ms": "^2.1.1"
           }
@@ -103,7 +122,6 @@
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/@resolver-engine/imports-fs/-/imports-fs-0.2.2.tgz",
       "integrity": "sha512-gFCgMvCwyppjwq0UzIjde/WI+yDs3oatJhozG9xdjJdewwtd7LiF0T5i9lrHAUtqrQbqoFE4E+ZMRVHWpWHpKQ==",
-      "dev": true,
       "requires": {
         "@resolver-engine/fs": "^0.2.1",
         "@resolver-engine/imports": "^0.2.2",
@@ -114,7 +132,6 @@
           "version": "3.2.6",
           "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
           "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
-          "dev": true,
           "requires": {
             "ms": "^2.1.1"
           }
@@ -124,18 +141,142 @@
     "@sindresorhus/is": {
       "version": "0.14.0",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
-      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ==",
-      "dev": true
+      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ=="
     },
     "@szmarczak/http-timer": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-1.1.2.tgz",
       "integrity": "sha512-XIB2XbzHTN6ieIjfIMV9hlVcfPU26s2vafYWQcZHWXHOxiaRZYEDKEwdl129Zyg50+foYV2jCgtrqSA6qNuNSA==",
-      "dev": true,
       "requires": {
         "defer-to-connect": "^1.0.1"
       }
     },
+    "@truffle/artifactor": {
+      "version": "4.0.38",
+      "resolved": "https://registry.npmjs.org/@truffle/artifactor/-/artifactor-4.0.38.tgz",
+      "integrity": "sha512-blkKmw0CdiJ4V2Xz9s8aHhcHHE3nr5jgQrgyI2fQhW3gfWLUUl9TQ+TLgNBDd90+aUqhPyTQRzy8lH1Z4xxmmg==",
+      "requires": {
+        "@truffle/contract-schema": "^3.0.18",
+        "fs-extra": "6.0.1",
+        "lodash": "^4.17.13"
+      }
+    },
+    "@truffle/blockchain-utils": {
+      "version": "0.0.14",
+      "resolved": "https://registry.npmjs.org/@truffle/blockchain-utils/-/blockchain-utils-0.0.14.tgz",
+      "integrity": "sha512-z+GQjI1HJCjZe+Mx5C2toT07MZZnhf13dfCO5/o99mk39yGFBCwv1f/1Emkf51699iRMAREQvDDIzBDg59eUhg==",
+      "requires": {
+        "@truffle/provider": "^0.2.1"
+      }
+    },
+    "@truffle/contract": {
+      "version": "4.0.39",
+      "resolved": "https://registry.npmjs.org/@truffle/contract/-/contract-4.0.39.tgz",
+      "integrity": "sha512-d07KCeQqE2AYEf2HcZkaqns34Fp81WE7t13TkRTAVnthBxu89cGcDFK2Dkip+1Wp9F/FT/qxUoPBdcFSpmBISg==",
+      "requires": {
+        "@truffle/blockchain-utils": "^0.0.14",
+        "@truffle/contract-schema": "^3.0.18",
+        "@truffle/error": "^0.0.7",
+        "@truffle/interface-adapter": "^0.3.2",
+        "bignumber.js": "^7.2.1",
+        "ethers": "^4.0.0-beta.1",
+        "web3": "1.2.2",
+        "web3-core-promievent": "1.2.2",
+        "web3-eth-abi": "1.2.2",
+        "web3-utils": "1.2.2"
+      }
+    },
+    "@truffle/contract-schema": {
+      "version": "3.0.18",
+      "resolved": "https://registry.npmjs.org/@truffle/contract-schema/-/contract-schema-3.0.18.tgz",
+      "integrity": "sha512-uuuXpgBzuu+RD5On0Xd7S9tB14uJfapnzrpGB5qR8D3wxv/2inUnCZnrHKc1OqjinqskBOW8CuURWBBmZnDJ3w==",
+      "requires": {
+        "ajv": "^6.10.0",
+        "crypto-js": "^3.1.9-1",
+        "debug": "^4.1.0"
+      }
+    },
+    "@truffle/error": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/@truffle/error/-/error-0.0.7.tgz",
+      "integrity": "sha512-UIfVKsXSXocKnn5+RNklUXNoGd/JVj7V8KmC48TQzmjU33HQI86PX0JDS7SpHMHasI3w9X//1q7Lu7nZtj3Zzg=="
+    },
+    "@truffle/hdwallet-provider": {
+      "version": "1.0.24",
+      "resolved": "https://registry.npmjs.org/@truffle/hdwallet-provider/-/hdwallet-provider-1.0.24.tgz",
+      "integrity": "sha512-8Y6mogh96W/5diIZIlV21KoOlX2e0zU8Gf+oqAFjE+iFKD2nO2BSrEDlOgg42AgLkPy+Y//QK5JuQwQPzpd6pA==",
+      "requires": {
+        "@truffle/provider": "^0.2.1",
+        "any-promise": "^1.3.0",
+        "bindings": "^1.5.0",
+        "bip39": "^2.4.2",
+        "ethereum-protocol": "^1.0.1",
+        "ethereumjs-tx": "^1.0.0",
+        "ethereumjs-util": "^6.1.0",
+        "ethereumjs-wallet": "^0.6.3",
+        "web3": "1.2.2",
+        "web3-provider-engine": "git+https://github.com/trufflesuite/provider-engine.git#web3-one"
+      },
+      "dependencies": {
+        "ethereumjs-tx": {
+          "version": "1.3.7",
+          "resolved": "https://registry.npmjs.org/ethereumjs-tx/-/ethereumjs-tx-1.3.7.tgz",
+          "integrity": "sha512-wvLMxzt1RPhAQ9Yi3/HKZTn0FZYpnsmQdbKYfUUpi4j1SEIcbkd9tndVjcPrufY3V7j2IebOpC00Zp2P/Ay2kA==",
+          "requires": {
+            "ethereum-common": "^0.0.18",
+            "ethereumjs-util": "^5.0.0"
+          },
+          "dependencies": {
+            "ethereumjs-util": {
+              "version": "5.2.0",
+              "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-5.2.0.tgz",
+              "integrity": "sha512-CJAKdI0wgMbQFLlLRtZKGcy/L6pzVRgelIZqRqNbuVFM3K9VEnyfbcvz0ncWMRNCe4kaHWjwRYQcYMucmwsnWA==",
+              "requires": {
+                "bn.js": "^4.11.0",
+                "create-hash": "^1.1.2",
+                "ethjs-util": "^0.1.3",
+                "keccak": "^1.0.2",
+                "rlp": "^2.0.0",
+                "safe-buffer": "^5.1.1",
+                "secp256k1": "^3.0.1"
+              }
+            }
+          }
+        },
+        "keccak": {
+          "version": "1.4.0",
+          "resolved": "https://registry.npmjs.org/keccak/-/keccak-1.4.0.tgz",
+          "integrity": "sha512-eZVaCpblK5formjPjeTBik7TAg+pqnDrMHIffSvi9Lh7PQgM1+hSzakUeZFCk9DVVG0dacZJuaz2ntwlzZUIBw==",
+          "requires": {
+            "bindings": "^1.2.1",
+            "inherits": "^2.0.3",
+            "nan": "^2.2.1",
+            "safe-buffer": "^5.1.0"
+          }
+        }
+      }
+    },
+    "@truffle/interface-adapter": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/@truffle/interface-adapter/-/interface-adapter-0.3.2.tgz",
+      "integrity": "sha512-hK6wkzfRMotVQ4TqUTXJBpVgISSZfQCjsc4XevkQLbUQzPXHhDqaIqGpIHmQ96RWAHKUlOOkHyJPpbWB4jnu1A==",
+      "requires": {
+        "bn.js": "^4.11.8",
+        "ethers": "^4.0.32",
+        "lodash": "^4.17.13",
+        "web3": "1.2.2"
+      }
+    },
+    "@truffle/provider": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/@truffle/provider/-/provider-0.2.1.tgz",
+      "integrity": "sha512-f87TJTWxZw/RMKw978GwI1PbQW1V+uOK49wztX55X324+Yf7LwjEP4XKVz2j+OQ2hZlsGjwd7I79ZPNQ4/cYkg==",
+      "requires": {
+        "@truffle/error": "^0.0.7",
+        "@truffle/interface-adapter": "^0.3.2",
+        "web3": "1.2.2"
+      }
+    },
     "@types/bn.js": {
       "version": "4.11.5",
       "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.5.tgz",
@@ -145,9 +286,9 @@
       }
     },
     "@types/node": {
-      "version": "10.14.12",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.12.tgz",
-      "integrity": "sha512-QcAKpaO6nhHLlxWBvpc4WeLrTvPqlHOvaj0s5GriKkA1zq+bsFBPpfYCvQhLqLgYlIko8A9YrPdaMHCo5mBcpg=="
+      "version": "10.17.4",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.17.4.tgz",
+      "integrity": "sha512-F2pgg+LcIr/elguz+x+fdBX5KeZXGUOp7TV8M0TVIrDezYLFRNt8oMTyps0VQ1kj5WGGoR18RdxnRDHXrIFHMQ=="
     },
     "JSONStream": {
       "version": "1.3.5",
@@ -158,6 +299,14 @@
         "through": ">=2.2.7 <3"
       }
     },
+    "abstract-leveldown": {
+      "version": "2.6.3",
+      "resolved": "https://registry.npmjs.org/abstract-leveldown/-/abstract-leveldown-2.6.3.tgz",
+      "integrity": "sha512-2++wDf/DYqkPR3o5tbfdhF96EfMApo1GpPfzOsR/ZYXdkSmELlvOOEAl9iKkRsktMPHdGjO4rtkBpf2I7TiTeA==",
+      "requires": {
+        "xtend": "~4.0.0"
+      }
+    },
     "accepts": {
       "version": "1.3.7",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
@@ -168,63 +317,39 @@
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     },
     "acorn": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.0.tgz",
-      "integrity": "sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw=="
-    },
-    "acorn-dynamic-import": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz",
-      "integrity": "sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw=="
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
+      "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ=="
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-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
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+      "version": "5.1.0",
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       "requires": {
-        "acorn": "^6.1.1",
-        "acorn-dynamic-import": "^4.0.0",
-        "acorn-walk": "^6.1.1",
-        "xtend": "^4.0.1"
+        "acorn": "^7.0.0",
+        "acorn-walk": "^7.0.0",
+        "xtend": "^4.0.2"
       }
     },
     "acorn-walk": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.2.0.tgz",
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+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.0.0.tgz",
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-      "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.12.tgz",
-      "integrity": "sha512-WvJ193OHa0GHPEL+AycEJgxvBEwyfRkN1vhjca23OaPVMCaLCXTd5qAu82AjTcgP1UJmytkOKb63Ypde7raDIg==",
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-        "inherits": "~2.0.0",
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       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
@@ -3703,49 +3576,130 @@
       "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc="
     },
     "ganache-cli": {
-      "version": "6.4.5",
-      "resolved": "https://registry.npmjs.org/ganache-cli/-/ganache-cli-6.4.5.tgz",
-      "integrity": "sha512-YHCE6AglvFShkPbU8iyxHqLxnSC3QdApIEgbuKUBiOPMLwNlINDOOsC8PFkX3oYZwRkuhexwv8olYZTvGoglrQ==",
+      "version": "6.7.0",
+      "resolved": "https://registry.npmjs.org/ganache-cli/-/ganache-cli-6.7.0.tgz",
+      "integrity": "sha512-9CZsClo9hl5MxGL7hkk14mie89Q94P0idh92jcV7LmppTYTCG7SHatuwcfqN7emFHArMt3fneN4QbH2do2N6Ow==",
       "requires": {
-        "bn.js": "4.11.8",
-        "source-map-support": "0.5.9",
-        "yargs": "11.1.0"
+        "ethereumjs-util": "6.1.0",
+        "source-map-support": "0.5.12",
+        "yargs": "13.2.4"
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "3.0.0",
+          "version": "4.1.0",
           "bundled": true
         },
+        "ansi-styles": {
+          "version": "3.2.1",
+          "bundled": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
+        },
+        "bindings": {
+          "version": "1.5.0",
+          "bundled": true,
+          "requires": {
+            "file-uri-to-path": "1.0.0"
+          }
+        },
+        "bip66": {
+          "version": "1.1.5",
+          "bundled": true,
+          "requires": {
+            "safe-buffer": "^5.0.1"
+          }
+        },
         "bn.js": {
           "version": "4.11.8",
           "bundled": true
         },
+        "brorand": {
+          "version": "1.1.0",
+          "bundled": true
+        },
+        "browserify-aes": {
+          "version": "1.2.0",
+          "bundled": true,
+          "requires": {
+            "buffer-xor": "^1.0.3",
+            "cipher-base": "^1.0.0",
+            "create-hash": "^1.1.0",
+            "evp_bytestokey": "^1.0.3",
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
+          }
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         "buffer-from": {
           "version": "1.1.1",
           "bundled": true
         },
-        "camelcase": {
-          "version": "4.1.0",
+        "buffer-xor": {
+          "version": "1.0.3",
           "bundled": true
         },
-        "cliui": {
-          "version": "4.1.0",
+        "camelcase": {
+          "version": "5.3.1",
+          "bundled": true
+        },
+        "cipher-base": {
+          "version": "1.0.4",
           "bundled": true,
           "requires": {
-            "string-width": "^2.1.1",
-            "strip-ansi": "^4.0.0",
-            "wrap-ansi": "^2.0.0"
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
           }
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-        "code-point-at": {
-          "version": "1.1.0",
-          "bundled": true
-        },
-        "cross-spawn": {
-          "version": "5.1.0",
+        "cliui": {
+          "version": "5.0.0",
           "bundled": true,
           "requires": {
-            "lru-cache": "^4.0.1",
+            "string-width": "^3.1.0",
+            "strip-ansi": "^5.2.0",
+            "wrap-ansi": "^5.1.0"
+          }
+        },
+        "color-convert": {
+          "version": "1.9.3",
+          "bundled": true,
+          "requires": {
+            "color-name": "1.1.3"
+          }
+        },
+        "color-name": {
+          "version": "1.1.3",
+          "bundled": true
+        },
+        "create-hash": {
+          "version": "1.2.0",
+          "bundled": true,
+          "requires": {
+            "cipher-base": "^1.0.1",
+            "inherits": "^2.0.1",
+            "md5.js": "^1.3.4",
+            "ripemd160": "^2.0.1",
+            "sha.js": "^2.4.0"
+          }
+        },
+        "create-hmac": {
+          "version": "1.1.7",
+          "bundled": true,
+          "requires": {
+            "cipher-base": "^1.0.3",
+            "create-hash": "^1.1.0",
+            "inherits": "^2.0.1",
+            "ripemd160": "^2.0.0",
+            "safe-buffer": "^5.0.1",
+            "sha.js": "^2.4.8"
+          }
+        },
+        "cross-spawn": {
+          "version": "6.0.5",
+          "bundled": true,
+          "requires": {
+            "nice-try": "^1.0.4",
+            "path-key": "^2.0.1",
+            "semver": "^5.5.0",
             "shebang-command": "^1.2.0",
             "which": "^1.2.9"
           }
@@ -3754,12 +3708,74 @@
           "version": "1.2.0",
           "bundled": true
         },
-        "execa": {
-          "version": "0.7.0",
+        "drbg.js": {
+          "version": "1.0.1",
           "bundled": true,
           "requires": {
-            "cross-spawn": "^5.0.1",
-            "get-stream": "^3.0.0",
+            "browserify-aes": "^1.0.6",
+            "create-hash": "^1.1.2",
+            "create-hmac": "^1.1.4"
+          }
+        },
+        "elliptic": {
+          "version": "6.5.0",
+          "bundled": true,
+          "requires": {
+            "bn.js": "^4.4.0",
+            "brorand": "^1.0.1",
+            "hash.js": "^1.0.0",
+            "hmac-drbg": "^1.0.0",
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0",
+            "minimalistic-crypto-utils": "^1.0.0"
+          }
+        },
+        "emoji-regex": {
+          "version": "7.0.3",
+          "bundled": true
+        },
+        "end-of-stream": {
+          "version": "1.4.1",
+          "bundled": true,
+          "requires": {
+            "once": "^1.4.0"
+          }
+        },
+        "ethereumjs-util": {
+          "version": "6.1.0",
+          "bundled": true,
+          "requires": {
+            "bn.js": "^4.11.0",
+            "create-hash": "^1.1.2",
+            "ethjs-util": "0.1.6",
+            "keccak": "^1.0.2",
+            "rlp": "^2.0.0",
+            "safe-buffer": "^5.1.1",
+            "secp256k1": "^3.0.1"
+          }
+        },
+        "ethjs-util": {
+          "version": "0.1.6",
+          "bundled": true,
+          "requires": {
+            "is-hex-prefixed": "1.0.0",
+            "strip-hex-prefix": "1.0.0"
+          }
+        },
+        "evp_bytestokey": {
+          "version": "1.0.3",
+          "bundled": true,
+          "requires": {
+            "md5.js": "^1.3.4",
+            "safe-buffer": "^5.1.1"
+          }
+        },
+        "execa": {
+          "version": "1.0.0",
+          "bundled": true,
+          "requires": {
+            "cross-spawn": "^6.0.0",
+            "get-stream": "^4.0.0",
             "is-stream": "^1.1.0",
             "npm-run-path": "^2.0.0",
             "p-finally": "^1.0.0",
@@ -3767,29 +3783,69 @@
             "strip-eof": "^1.0.0"
           }
         },
+        "file-uri-to-path": {
+          "version": "1.0.0",
+          "bundled": true
+        },
         "find-up": {
-          "version": "2.1.0",
+          "version": "3.0.0",
           "bundled": true,
           "requires": {
-            "locate-path": "^2.0.0"
+            "locate-path": "^3.0.0"
           }
         },
         "get-caller-file": {
-          "version": "1.0.3",
+          "version": "2.0.5",
           "bundled": true
         },
         "get-stream": {
-          "version": "3.0.0",
+          "version": "4.1.0",
+          "bundled": true,
+          "requires": {
+            "pump": "^3.0.0"
+          }
+        },
+        "hash-base": {
+          "version": "3.0.4",
+          "bundled": true,
+          "requires": {
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.0.1"
+          }
+        },
+        "hash.js": {
+          "version": "1.1.7",
+          "bundled": true,
+          "requires": {
+            "inherits": "^2.0.3",
+            "minimalistic-assert": "^1.0.1"
+          }
+        },
+        "hmac-drbg": {
+          "version": "1.0.1",
+          "bundled": true,
+          "requires": {
+            "hash.js": "^1.0.3",
+            "minimalistic-assert": "^1.0.0",
+            "minimalistic-crypto-utils": "^1.0.1"
+          }
+        },
+        "inherits": {
+          "version": "2.0.4",
           "bundled": true
         },
         "invert-kv": {
-          "version": "1.0.0",
+          "version": "2.0.0",
           "bundled": true
         },
         "is-fullwidth-code-point": {
           "version": "2.0.0",
           "bundled": true
         },
+        "is-hex-prefixed": {
+          "version": "1.0.0",
+          "bundled": true
+        },
         "is-stream": {
           "version": "1.1.0",
           "bundled": true
@@ -3798,38 +3854,74 @@
           "version": "2.0.0",
           "bundled": true
         },
-        "lcid": {
-          "version": "1.0.0",
+        "keccak": {
+          "version": "1.4.0",
           "bundled": true,
           "requires": {
-            "invert-kv": "^1.0.0"
+            "bindings": "^1.2.1",
+            "inherits": "^2.0.3",
+            "nan": "^2.2.1",
+            "safe-buffer": "^5.1.0"
           }
         },
-        "locate-path": {
+        "lcid": {
           "version": "2.0.0",
           "bundled": true,
           "requires": {
-            "p-locate": "^2.0.0",
+            "invert-kv": "^2.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "bundled": true,
+          "requires": {
+            "p-locate": "^3.0.0",
             "path-exists": "^3.0.0"
           }
         },
-        "lru-cache": {
-          "version": "4.1.4",
+        "map-age-cleaner": {
+          "version": "0.1.3",
           "bundled": true,
           "requires": {
-            "pseudomap": "^1.0.2",
-            "yallist": "^3.0.2"
+            "p-defer": "^1.0.0"
+          }
+        },
+        "md5.js": {
+          "version": "1.3.5",
+          "bundled": true,
+          "requires": {
+            "hash-base": "^3.0.0",
+            "inherits": "^2.0.1",
+            "safe-buffer": "^5.1.2"
           }
         },
         "mem": {
-          "version": "1.1.0",
+          "version": "4.3.0",
           "bundled": true,
           "requires": {
-            "mimic-fn": "^1.0.0"
+            "map-age-cleaner": "^0.1.1",
+            "mimic-fn": "^2.0.0",
+            "p-is-promise": "^2.0.0"
           }
         },
         "mimic-fn": {
-          "version": "1.2.0",
+          "version": "2.1.0",
+          "bundled": true
+        },
+        "minimalistic-assert": {
+          "version": "1.0.1",
+          "bundled": true
+        },
+        "minimalistic-crypto-utils": {
+          "version": "1.0.1",
+          "bundled": true
+        },
+        "nan": {
+          "version": "2.14.0",
+          "bundled": true
+        },
+        "nice-try": {
+          "version": "1.0.5",
           "bundled": true
         },
         "npm-run-path": {
@@ -3839,39 +3931,50 @@
             "path-key": "^2.0.0"
           }
         },
-        "number-is-nan": {
-          "version": "1.0.1",
-          "bundled": true
-        },
-        "os-locale": {
-          "version": "2.1.0",
+        "once": {
+          "version": "1.4.0",
           "bundled": true,
           "requires": {
-            "execa": "^0.7.0",
-            "lcid": "^1.0.0",
-            "mem": "^1.1.0"
+            "wrappy": "1"
           }
         },
+        "os-locale": {
+          "version": "3.1.0",
+          "bundled": true,
+          "requires": {
+            "execa": "^1.0.0",
+            "lcid": "^2.0.0",
+            "mem": "^4.0.0"
+          }
+        },
+        "p-defer": {
+          "version": "1.0.0",
+          "bundled": true
+        },
         "p-finally": {
           "version": "1.0.0",
           "bundled": true
         },
+        "p-is-promise": {
+          "version": "2.1.0",
+          "bundled": true
+        },
         "p-limit": {
-          "version": "1.3.0",
+          "version": "2.2.0",
           "bundled": true,
           "requires": {
-            "p-try": "^1.0.0"
+            "p-try": "^2.0.0"
           }
         },
         "p-locate": {
-          "version": "2.0.0",
+          "version": "3.0.0",
           "bundled": true,
           "requires": {
-            "p-limit": "^1.1.0"
+            "p-limit": "^2.0.0"
           }
         },
         "p-try": {
-          "version": "1.0.0",
+          "version": "2.2.0",
           "bundled": true
         },
         "path-exists": {
@@ -3882,22 +3985,72 @@
           "version": "2.0.1",
           "bundled": true
         },
-        "pseudomap": {
-          "version": "1.0.2",
-          "bundled": true
+        "pump": {
+          "version": "3.0.0",
+          "bundled": true,
+          "requires": {
+            "end-of-stream": "^1.1.0",
+            "once": "^1.3.1"
+          }
         },
         "require-directory": {
           "version": "2.1.1",
           "bundled": true
         },
         "require-main-filename": {
-          "version": "1.0.1",
+          "version": "2.0.0",
+          "bundled": true
+        },
+        "ripemd160": {
+          "version": "2.0.2",
+          "bundled": true,
+          "requires": {
+            "hash-base": "^3.0.0",
+            "inherits": "^2.0.1"
+          }
+        },
+        "rlp": {
+          "version": "2.2.3",
+          "bundled": true,
+          "requires": {
+            "bn.js": "^4.11.1",
+            "safe-buffer": "^5.1.1"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.2.0",
+          "bundled": true
+        },
+        "secp256k1": {
+          "version": "3.7.1",
+          "bundled": true,
+          "requires": {
+            "bindings": "^1.5.0",
+            "bip66": "^1.1.5",
+            "bn.js": "^4.11.8",
+            "create-hash": "^1.2.0",
+            "drbg.js": "^1.0.1",
+            "elliptic": "^6.4.1",
+            "nan": "^2.14.0",
+            "safe-buffer": "^5.1.2"
+          }
+        },
+        "semver": {
+          "version": "5.7.0",
           "bundled": true
         },
         "set-blocking": {
           "version": "2.0.0",
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+          "requires": {
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+          }
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+    "web3-providers-http": {
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+      "resolved": "https://registry.npmjs.org/web3-providers-http/-/web3-providers-http-1.2.2.tgz",
+      "integrity": "sha512-BNZ7Hguy3eBszsarH5gqr9SIZNvqk9eKwqwmGH1LQS1FL3NdoOn7tgPPdddrXec4fL94CwgNk4rCU+OjjZRNDg==",
+      "requires": {
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+        "xhr2-cookies": "1.1.0"
+      }
+    },
+    "web3-providers-ipc": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/web3-providers-ipc/-/web3-providers-ipc-1.2.2.tgz",
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+      "requires": {
+        "oboe": "2.1.4",
+        "underscore": "1.9.1",
+        "web3-core-helpers": "1.2.2"
+      }
+    },
+    "web3-providers-ws": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/web3-providers-ws/-/web3-providers-ws-1.2.2.tgz",
+      "integrity": "sha512-Wb1mrWTGMTXOpJkL0yGvL/WYLt8fUIXx8k/l52QB2IiKzvyd42dTWn4+j8IKXGSYYzOm7NMqv6nhA5VDk12VfA==",
+      "requires": {
+        "underscore": "1.9.1",
+        "web3-core-helpers": "1.2.2",
+        "websocket": "github:web3-js/WebSocket-Node#polyfill/globalThis"
+      }
+    },
+    "web3-shh": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/web3-shh/-/web3-shh-1.2.2.tgz",
+      "integrity": "sha512-og258NPhlBn8yYrDWjoWBBb6zo1OlBgoWGT+LL5/LPqRbjPe09hlOYHgscAAr9zZGtohTOty7RrxYw6Z6oDWCg==",
+      "requires": {
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+        "web3-core-method": "1.2.2",
+        "web3-core-subscriptions": "1.2.2",
+        "web3-net": "1.2.2"
+      }
+    },
+    "web3-utils": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/web3-utils/-/web3-utils-1.2.2.tgz",
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+      "requires": {
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+        "eth-lib": "0.2.7",
+        "ethereum-bloom-filters": "^1.0.6",
+        "ethjs-unit": "0.1.6",
+        "number-to-bn": "1.7.0",
+        "randombytes": "^2.1.0",
+        "underscore": "1.9.1",
+        "utf8": "3.0.0"
+      },
+      "dependencies": {
+        "elliptic": {
+          "version": "6.5.1",
+          "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.1.tgz",
+          "integrity": "sha512-xvJINNLbTeWQjrl6X+7eQCrIy/YPv5XCpKW6kB5mKvtnGILoLDcySuwomfdzt0BMdLNVnuRNTuzKNHj0bva1Cg==",
+          "requires": {
+            "bn.js": "^4.4.0",
+            "brorand": "^1.0.1",
+            "hash.js": "^1.0.0",
+            "hmac-drbg": "^1.0.0",
+            "inherits": "^2.0.1",
+            "minimalistic-assert": "^1.0.0",
+            "minimalistic-crypto-utils": "^1.0.0"
+          }
+        },
+        "eth-lib": {
+          "version": "0.2.7",
+          "resolved": "https://registry.npmjs.org/eth-lib/-/eth-lib-0.2.7.tgz",
+          "integrity": "sha1-L5Pxex4jrsN1nNSj/iDBKGo/wco=",
+          "requires": {
+            "bn.js": "^4.11.6",
+            "elliptic": "^6.4.0",
+            "xhr-request-promise": "^0.1.2"
+          }
         }
       }
     },
     "websnark": {
-      "version": "git+https://github.com/peppersec/websnark.git#966eafc47df639195c98374d3c366c32acd6f231",
-      "from": "git+https://github.com/peppersec/websnark.git#966eafc47df639195c98374d3c366c32acd6f231",
+      "version": "git+https://github.com/peppersec/websnark.git#c254b5962287b788081be1047fa0041c2885b39f",
+      "from": "git+https://github.com/peppersec/websnark.git#c254b5962287b788081be1047fa0041c2885b39f",
       "requires": {
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     "websocket": {
-      "version": "1.0.29",
-      "resolved": "https://registry.npmjs.org/websocket/-/websocket-1.0.29.tgz",
-      "integrity": "sha512-WhU8jKXC8sTh6ocLSqpZRlOKMNYGwUvjA5+XcIgIk/G3JCaDfkZUr0zA19sVSxJ0TEvm0i5IBzr54RZC4vzW7g==",
+      "version": "github:web3-js/WebSocket-Node#905deb4812572b344f5801f8c9ce8bb02799d82e",
+      "from": "github:web3-js/WebSocket-Node#polyfill/globalThis",
       "requires": {
         "debug": "^2.2.0",
-        "gulp": "^4.0.2",
-        "nan": "^2.11.0",
+        "es5-ext": "^0.10.50",
+        "nan": "^2.14.0",
         "typedarray-to-buffer": "^3.1.5",
         "yaeti": "^0.0.6"
       },
@@ -10902,9 +7777,19 @@
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           "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+        },
+        "nan": {
+          "version": "2.14.0",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.0.tgz",
+          "integrity": "sha512-INOFj37C7k3AfaNTtX8RhsTw7qRy7eLET14cROi9+5HAVbbHuIWUHEauBv5qT4Av2tWasiTY1Jw6puUNqRJXQg=="
         }
       }
     },
+    "whatwg-fetch": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz",
+      "integrity": "sha512-dcQ1GWpOD/eEQ97k66aiEVpNnapVj90/+R+SXTPYGHpYBBypfKJEQjLrvMZ7YXbKm21gXd4NcuxUTjiv1YtLng=="
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -10918,14 +7803,10 @@
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       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
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-    "widest-line": {
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-      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz",
-      "integrity": "sha512-Ba5m9/Fa4Xt9eb2ELXt77JxVDV8w7qQrH0zS/TWSJdLyAwQjWoOzpzj5lwVftDz6n/EOu3tNACS84v509qwnJA==",
-      "dev": true,
-      "requires": {
-        "string-width": "^2.1.1"
-      }
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ=="
     },
     "wordwrap": {
       "version": "0.0.3",
@@ -10941,11 +7822,6 @@
         "strip-ansi": "^3.0.1"
       },
       "dependencies": {
-        "ansi-regex": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
-        },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
@@ -10963,14 +7839,6 @@
             "is-fullwidth-code-point": "^1.0.0",
             "strip-ansi": "^3.0.0"
           }
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-          "requires": {
-            "ansi-regex": "^2.0.0"
-          }
         }
       }
     },
@@ -10987,17 +7855,6 @@
         "mkdirp": "^0.5.1"
       }
     },
-    "write-file-atomic": {
-      "version": "2.4.3",
-      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.3.tgz",
-      "integrity": "sha512-GaETH5wwsX+GcnzhPgKcKjJ6M2Cq3/iZp1WyY/X1CSqrW+jVNM9Y7D8EC2sM4ZG/V8wZlSniJnCKWPmBYAucRQ==",
-      "dev": true,
-      "requires": {
-        "graceful-fs": "^4.1.11",
-        "imurmurhash": "^0.1.4",
-        "signal-exit": "^3.0.2"
-      }
-    },
     "ws": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
@@ -11015,12 +7872,6 @@
         }
       }
     },
-    "xdg-basedir": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
-      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
-      "dev": true
-    },
     "xhr": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/xhr/-/xhr-2.5.0.tgz",
@@ -11083,10 +7934,9 @@
       "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
     },
     "yallist": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
-      "integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
-      "dev": true
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
     },
     "yargs": {
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diff --git a/package.json b/package.json
index 959edb5..d093a91 100644
--- a/package.json
+++ b/package.json
@@ -26,26 +26,24 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@openzeppelin/contracts": "^2.3.0",
+    "@openzeppelin/contracts": "^2.4.0",
+    "@truffle/artifactor": "^4.0.38",
+    "@truffle/contract": "^4.0.39",
+    "@truffle/hdwallet-provider": "^1.0.24",
     "bn-chai": "^1.0.1",
-    "browserify": "^16.3.0",
+    "browserify": "^16.5.0",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "circom": "0.0.34",
-    "circomlib": "^0.0.18",
-    "dotenv": "^8.0.0",
-    "eslint": "^6.2.2",
-    "ganache-cli": "^6.4.5",
+    "circomlib": "^0.0.19",
+    "dotenv": "^8.2.0",
+    "eslint": "^6.6.0",
+    "ganache-cli": "^6.7.0",
     "snarkjs": "git+https://github.com/peppersec/snarkjs.git#869181cfaf7526fe8972073d31655493a04326d5",
-    "truffle": "^5.0.27",
-    "truffle-artifactor": "^4.0.23",
-    "truffle-contract": "^4.0.24",
-    "truffle-hdwallet-provider": "^1.0.14",
-    "web3": "^1.0.0-beta.55",
-    "web3-utils": "^1.0.0-beta.55",
+    "truffle": "^5.0.44",
+    "truffle-flattener": "^1.4.2",
+    "web3": "^1.2.2",
+    "web3-utils": "^1.2.2",
     "websnark": "git+https://github.com/peppersec/websnark.git#c254b5962287b788081be1047fa0041c2885b39f"
-  },
-  "devDependencies": {
-    "truffle-flattener": "^1.4.0"
   }
 }
diff --git a/truffle-config.js b/truffle-config.js
index feb59fe..c74d15f 100644
--- a/truffle-config.js
+++ b/truffle-config.js
@@ -1,5 +1,5 @@
 require('dotenv').config()
-const HDWalletProvider = require('truffle-hdwallet-provider')
+const HDWalletProvider = require('@truffle/hdwallet-provider')
 const utils = require('web3-utils')
 // const infuraKey = "fj4jll3k.....";
 //