diff --git a/nightfall-optimist/Dockerfile b/nightfall-optimist/Dockerfile
index b9bbdca9c..e7f8eef50 100644
--- a/nightfall-optimist/Dockerfile
+++ b/nightfall-optimist/Dockerfile
@@ -1,3 +1,5 @@
+# install zokrates for local verify
+FROM zokrates/zokrates:0.7.7 as builder
 FROM mongo:4.4.1-bionic
 
 # install node
@@ -10,6 +12,8 @@ RUN apt-get install -y curl
 RUN curl -sL https://deb.nodesource.com/setup_14.x | bash -
 RUN apt-get install -y nodejs
 RUN apt-get install -y netcat
+# installs libs required for zokrates
+RUN apt-get install -y libgmpxx4ldbl libgmp3-dev
 
 WORKDIR /common-files
 RUN echo "{\"name\": \"common-files\"}" > package.json
@@ -17,6 +21,12 @@ RUN echo "{\"name\": \"common-files\"}" > package.json
 WORKDIR /app
 RUN mkdir /app/mongodb
 
+COPY --from=builder /home/zokrates/.zokrates/bin/zokrates /app/zokrates
+COPY --from=builder /home/zokrates/.zokrates/stdlib /app/stdlib/
+
+ENV ZOKRATES_HOME /app
+ENV ZOKRATES_STDLIB /app/stdlib
+
 COPY src src
 COPY docker-entrypoint.sh pre-start-script.sh package.json package-lock.json ./
 
diff --git a/nightfall-optimist/package-lock.json b/nightfall-optimist/package-lock.json
index ae6a21029..086eeab44 100644
--- a/nightfall-optimist/package-lock.json
+++ b/nightfall-optimist/package-lock.json
@@ -1,24 +1,56 @@
 {
   "name": "nightfall-optimist",
   "version": "0.1.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 2,
   "requires": true,
-  "dependencies": {
-    "@dabh/diagnostics": {
+  "packages": {
+    "": {
+      "version": "0.1.0",
+      "license": "CC0-1.0",
+      "dependencies": {
+        "axios": "^0.21.1",
+        "body-parser": "1.19.0",
+        "common-files": "file:../common-files",
+        "config": "^3.3.1",
+        "cors": "2.8.5",
+        "express": "^4.17.1",
+        "express-fileupload": "^1.1.7-alpha.4",
+        "general-number": "^1.0.1",
+        "hex-to-binary": "^1.0.1",
+        "jsonfile": "^6.1.0",
+        "keccak": "^3.0.1",
+        "mongodb": "^3.6.3",
+        "queue": "^6.0.2",
+        "safe-buffer": "^5.2.1",
+        "tar": "^6.1.6",
+        "web3": "^1.3.0",
+        "winston": "^3.3.3",
+        "ws": "^7.4.3"
+      },
+      "devDependencies": {
+        "mocha": "^8.3.2",
+        "nodemon": "^2.0.12"
+      }
+    },
+    "../common-files": {
+      "version": "1.0.0",
+      "license": "ISC"
+    },
+    "node_modules/@dabh/diagnostics": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/@dabh/diagnostics/-/diagnostics-2.0.2.tgz",
       "integrity": "sha512-+A1YivoVDNNVCdfozHSR8v/jyuuLTMXwjWuxPFlFlUapXoGc+Gj9mDlTDDfrwl7rXCl2tNZ0kE8sIBO6YOn96Q==",
-      "requires": {
+      "dependencies": {
         "colorspace": "1.1.x",
         "enabled": "2.0.x",
         "kuler": "^2.0.0"
       }
     },
-    "@ethersproject/abi": {
+    "node_modules/@ethersproject/abi": {
       "version": "5.0.7",
       "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.0.7.tgz",
       "integrity": "sha512-Cqktk+hSIckwP/W8O47Eef60VwmoSC/L3lY0+dIBhQPCNn9E4V7rwmm2aFrNRRDJfFlGuZ1khkQUOc3oBX+niw==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/address": "^5.0.4",
         "@ethersproject/bignumber": "^5.0.7",
         "@ethersproject/bytes": "^5.0.4",
@@ -30,11 +62,11 @@
         "@ethersproject/strings": "^5.0.4"
       }
     },
-    "@ethersproject/abstract-provider": {
+    "node_modules/@ethersproject/abstract-provider": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/abstract-provider/-/abstract-provider-5.2.0.tgz",
       "integrity": "sha512-Xi7Pt+CulRijc/vskBGIaYMEhafKjoNx8y4RNj/dnSpXHXScOJUSTtypqGBUngZddRbcwZGbHwEr6DZoKZwIZA==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bignumber": "^5.2.0",
         "@ethersproject/bytes": "^5.2.0",
         "@ethersproject/logger": "^5.2.0",
@@ -44,11 +76,11 @@
         "@ethersproject/web": "^5.2.0"
       }
     },
-    "@ethersproject/abstract-signer": {
+    "node_modules/@ethersproject/abstract-signer": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/abstract-signer/-/abstract-signer-5.2.0.tgz",
       "integrity": "sha512-JTXzLUrtoxpOEq1ecH86U7tstkEa9POKAGbGBb+gicbjGgzYYkLR4/LD83SX2/JNWvtYyY8t5errt5ehiy1gxQ==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/abstract-provider": "^5.2.0",
         "@ethersproject/bignumber": "^5.2.0",
         "@ethersproject/bytes": "^5.2.0",
@@ -56,11 +88,11 @@
         "@ethersproject/properties": "^5.2.0"
       }
     },
-    "@ethersproject/address": {
+    "node_modules/@ethersproject/address": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/address/-/address-5.2.0.tgz",
       "integrity": "sha512-2YfZlalWefOEfnr/CdqKRrgMgbKidYc+zG4/ilxSdcryZSux3eBU5/5btAT/hSiaHipUjd8UrWK8esCBHU6QNQ==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bignumber": "^5.2.0",
         "@ethersproject/bytes": "^5.2.0",
         "@ethersproject/keccak256": "^5.2.0",
@@ -68,45 +100,45 @@
         "@ethersproject/rlp": "^5.2.0"
       }
     },
-    "@ethersproject/base64": {
+    "node_modules/@ethersproject/base64": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/base64/-/base64-5.2.0.tgz",
       "integrity": "sha512-D9wOvRE90QBI+yFsKMv0hnANiMzf40Xicq9JZbV9XYzh7srImmwmMcReU2wHjOs9FtEgSJo51Tt+sI1dKPYKDg==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bytes": "^5.2.0"
       }
     },
-    "@ethersproject/bignumber": {
+    "node_modules/@ethersproject/bignumber": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/bignumber/-/bignumber-5.2.0.tgz",
       "integrity": "sha512-+MNQTxwV7GEiA4NH/i51UqQ+lY36O0rxPdV+0qzjFSySiyBlJpLk6aaa4UTvKmYWlI7YKZm6vuyCENeYn7qAOw==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bytes": "^5.2.0",
         "@ethersproject/logger": "^5.2.0",
         "bn.js": "^4.4.0"
       }
     },
-    "@ethersproject/bytes": {
+    "node_modules/@ethersproject/bytes": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/bytes/-/bytes-5.2.0.tgz",
       "integrity": "sha512-O1CRpvJDnRTB47vvW8vyqojUZxVookb4LJv/s06TotriU3Xje5WFvlvXJu1yTchtxTz9BbvJw0lFXKpyO6Dn7w==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/logger": "^5.2.0"
       }
     },
-    "@ethersproject/constants": {
+    "node_modules/@ethersproject/constants": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/constants/-/constants-5.2.0.tgz",
       "integrity": "sha512-p+34YG0KbHS20NGdE+Ic0M6egzd7cDvcfoO9RpaAgyAYm3V5gJVqL7UynS87yCt6O6Nlx6wRFboPiM5ctAr+jA==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bignumber": "^5.2.0"
       }
     },
-    "@ethersproject/hash": {
+    "node_modules/@ethersproject/hash": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/hash/-/hash-5.2.0.tgz",
       "integrity": "sha512-wEGry2HFFSssFiNEkFWMzj1vpdFv4rQlkBp41UfL6J58zKGNycoAWimokITDMk8p7548MKr27h48QfERnNKkRw==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/abstract-signer": "^5.2.0",
         "@ethersproject/address": "^5.2.0",
         "@ethersproject/bignumber": "^5.2.0",
@@ -117,57 +149,55 @@
         "@ethersproject/strings": "^5.2.0"
       }
     },
-    "@ethersproject/keccak256": {
+    "node_modules/@ethersproject/keccak256": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/keccak256/-/keccak256-5.2.0.tgz",
       "integrity": "sha512-LqyxTwVANga5Y3L1yo184czW6b3PibabN8xyE/eOulQLLfXNrHHhwrOTpOhoVRWCICVCD/5SjQfwqTrczjS7jQ==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bytes": "^5.2.0",
         "js-sha3": "0.5.7"
-      },
-      "dependencies": {
-        "js-sha3": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/js-sha3/-/js-sha3-0.5.7.tgz",
-          "integrity": "sha1-DU/9gALVMzqrr0oj7tL2N0yfKOc="
-        }
       }
     },
-    "@ethersproject/logger": {
+    "node_modules/@ethersproject/keccak256/node_modules/js-sha3": {
+      "version": "0.5.7",
+      "resolved": "https://registry.npmjs.org/js-sha3/-/js-sha3-0.5.7.tgz",
+      "integrity": "sha1-DU/9gALVMzqrr0oj7tL2N0yfKOc="
+    },
+    "node_modules/@ethersproject/logger": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/logger/-/logger-5.2.0.tgz",
       "integrity": "sha512-dPZ6/E3YiArgG8dI/spGkaRDry7YZpCntf4gm/c6SI8Mbqiihd7q3nuLN5VvDap/0K3xm3RE1AIUOcUwwh2ezQ=="
     },
-    "@ethersproject/networks": {
+    "node_modules/@ethersproject/networks": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/networks/-/networks-5.2.0.tgz",
       "integrity": "sha512-q+htMgq7wQoEnjlkdHM6t1sktKxNbEB/F6DQBPNwru7KpQ1R0n0UTIXJB8Rb7lSnvjqcAQ40X3iVqm94NJfYDw==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/logger": "^5.2.0"
       }
     },
-    "@ethersproject/properties": {
+    "node_modules/@ethersproject/properties": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/properties/-/properties-5.2.0.tgz",
       "integrity": "sha512-oNFkzcoGwXXV+/Yp/MLcDLrL/2i360XIy2YN9yRZJPnIbLwjroFNLiRzLs6PyPw1D09Xs8OcPR1/nHv6xDKE2A==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/logger": "^5.2.0"
       }
     },
-    "@ethersproject/rlp": {
+    "node_modules/@ethersproject/rlp": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/rlp/-/rlp-5.2.0.tgz",
       "integrity": "sha512-RqGsELtPWxcFhOOhSr0lQ2hBNT9tBE08WK0tb6VQbCk97EpqkbgP8yXED9PZlWMiRGchJTw6S+ExzK62XMX/fw==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bytes": "^5.2.0",
         "@ethersproject/logger": "^5.2.0"
       }
     },
-    "@ethersproject/signing-key": {
+    "node_modules/@ethersproject/signing-key": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/signing-key/-/signing-key-5.2.0.tgz",
       "integrity": "sha512-9A+dVSkrVAPuhJnWqLWV/NkKi/KB4iagTKEuojfuApUfeIHEhpwQ0Jx3cBimk7qWISSSKdgiAmIqpvVtZ5FEkg==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bytes": "^5.2.0",
         "@ethersproject/logger": "^5.2.0",
         "@ethersproject/properties": "^5.2.0",
@@ -175,21 +205,21 @@
         "elliptic": "6.5.4"
       }
     },
-    "@ethersproject/strings": {
+    "node_modules/@ethersproject/strings": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/strings/-/strings-5.2.0.tgz",
       "integrity": "sha512-RmjX800wRYKgrzo2ZCSlA8OCQYyq4+M46VgjSVDVyYkLZctBXC3epqlppDA24R7eo856KNbXqezZsMnHT+sSuA==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/bytes": "^5.2.0",
         "@ethersproject/constants": "^5.2.0",
         "@ethersproject/logger": "^5.2.0"
       }
     },
-    "@ethersproject/transactions": {
+    "node_modules/@ethersproject/transactions": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/transactions/-/transactions-5.2.0.tgz",
       "integrity": "sha512-QrGbhGYsouNNclUp3tWMbckMsuXJTOsA56kT3BuRrLlXJcUH7myIihajXdSfKcyJsvHJPrGZP+U3TKh+sLzZtg==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/address": "^5.2.0",
         "@ethersproject/bignumber": "^5.2.0",
         "@ethersproject/bytes": "^5.2.0",
@@ -201,11 +231,11 @@
         "@ethersproject/signing-key": "^5.2.0"
       }
     },
-    "@ethersproject/web": {
+    "node_modules/@ethersproject/web": {
       "version": "5.2.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/web/-/web-5.2.0.tgz",
       "integrity": "sha512-mYb9qxGlOBFR2pR6t1CZczuqqX6r8RQGn7MtwrBciMex3cvA/qs+wbmcDgl+/OZY0Pco/ih6WHQRnVi+4sBeCQ==",
-      "requires": {
+      "dependencies": {
         "@ethersproject/base64": "^5.2.0",
         "@ethersproject/bytes": "^5.2.0",
         "@ethersproject/logger": "^5.2.0",
@@ -213,354 +243,395 @@
         "@ethersproject/strings": "^5.2.0"
       }
     },
-    "@sindresorhus/is": {
+    "node_modules/@sindresorhus/is": {
       "version": "0.14.0",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
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+      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ==",
+      "engines": {
+        "node": ">=6"
+      }
     },
-    "@szmarczak/http-timer": {
+    "node_modules/@szmarczak/http-timer": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-1.1.2.tgz",
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+      },
+      "engines": {
+        "node": ">=6"
       }
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-    "@types/bn.js": {
+    "node_modules/@types/bn.js": {
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-      "requires": {
+      "dependencies": {
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+    "node_modules/@types/secp256k1": {
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         "@types/node": "*"
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+    "node_modules/@ungap/promise-all-settled": {
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+          "dev": true
         },
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-          "requires": {
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-          }
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+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
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+          "dev": true
         },
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-          "resolved": "https://registry.npmjs.org/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz",
-          "integrity": "sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=",
+        "string-width": {
+          "version": "4.2.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.2.tgz",
+          "integrity": "sha512-XBJbT3N4JhVumXE0eoLU9DCjcaF92KLNqTmFCnG1pf8duUxFGwtP6AD6nkjw9a3IdiRtL3E2w3JDiE/xi3vOeA==",
+          "dev": true,
           "requires": {
-            "cookiejar": "^2.1.1"
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
           }
         },
-        "xtend": {
-          "version": "4.0.2",
-          "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
-          "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
-        },
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-          "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
-        },
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-        },
-        "zkp-utils": {
-          "version": "1.0.8",
-          "resolved": "https://registry.npmjs.org/zkp-utils/-/zkp-utils-1.0.8.tgz",
-          "integrity": "sha512-F4PM4bfg8AHs4zZ4RGWjSo7De0Ek85H2XOMRsCbXrCbbkxiKeTJ8Er8ykiIEjvWii92S523wfCf+kjD7aMqJ1g==",
+        "strip-ansi": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+          "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+          "dev": true,
           "requires": {
-            "big-integer": "^1.6.48",
-            "keccak": "^3.0.1",
-            "winston": "^3.3.3"
-          },
-          "dependencies": {
-            "big-integer": {
-              "version": "1.6.48",
-              "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.48.tgz",
-              "integrity": "sha512-j51egjPa7/i+RdiRuJbPdJ2FIUYYPhvYLjzoYbcMMm62ooO6F94fETG4MTs46zPAF9Brs04OajboA/qTGuz78w=="
-            },
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-              "resolved": "https://registry.npmjs.org/keccak/-/keccak-3.0.1.tgz",
-              "integrity": "sha512-epq90L9jlFWCW7+pQa6JOnKn2Xgl2mtI664seYR6MHskvI9agt7AnDqmAlp9TqU4/caMYbA08Hi5DMZAl5zdkA==",
-              "requires": {
-                "node-addon-api": "^2.0.0",
-                "node-gyp-build": "^4.2.0"
-              }
-            },
-            "winston": {
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-              "resolved": "https://registry.npmjs.org/winston/-/winston-3.3.3.tgz",
-              "integrity": "sha512-oEXTISQnC8VlSAKf1KYSSd7J6IWuRPQqDdo8eoRNaYKLvwSb5+79Z3Yi1lrl6KDpU6/VWaxpakDAtb1oQ4n9aw==",
-              "requires": {
-                "@dabh/diagnostics": "^2.0.2",
-                "async": "^3.1.0",
-                "is-stream": "^2.0.0",
-                "logform": "^2.2.0",
-                "one-time": "^1.0.0",
-                "readable-stream": "^3.4.0",
-                "stack-trace": "0.0.x",
-                "triple-beam": "^1.3.0",
-                "winston-transport": "^4.4.0"
-              }
-            }
+            "ansi-regex": "^5.0.0"
           }
         }
       }
     },
+    "clone-response": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/clone-response/-/clone-response-1.0.2.tgz",
+      "integrity": "sha1-0dyXOSAxTfZ/vrlCI7TuNQI56Ws=",
+      "requires": {
+        "mimic-response": "^1.0.0"
+      }
+    },
+    "color": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/color/-/color-3.0.0.tgz",
+      "integrity": "sha512-jCpd5+s0s0t7p3pHQKpnJ0TpQKKdleP71LWcA0aqiljpiuAkOSUFN/dyH8ZwF0hRmFlrIuRhufds1QyEP9EB+w==",
+      "requires": {
+        "color-convert": "^1.9.1",
+        "color-string": "^1.5.2"
+      }
+    },
+    "color-convert": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
+      "requires": {
+        "color-name": "1.1.3"
+      }
+    },
+    "color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
+    },
+    "color-string": {
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.5.5.tgz",
+      "integrity": "sha512-jgIoum0OfQfq9Whcfc2z/VhCNcmQjWbey6qBX0vqt7YICflUmBCh9E9CiQD5GSJ+Uehixm3NUwHVhqUAWRivZg==",
+      "requires": {
+        "color-name": "^1.0.0",
+        "simple-swizzle": "^0.2.2"
+      }
+    },
+    "colors": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
+      "integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA=="
+    },
+    "colorspace": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/colorspace/-/colorspace-1.1.2.tgz",
+      "integrity": "sha512-vt+OoIP2d76xLhjwbBaucYlNSpPsrJWPlBTtwCpQKIu6/CSMutyzX93O/Do0qzpH3YoHEes8YEFXyZ797rEhzQ==",
+      "requires": {
+        "color": "3.0.x",
+        "text-hex": "1.0.x"
+      }
+    },
+    "combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "requires": {
+        "delayed-stream": "~1.0.0"
+      }
+    },
+    "common-files": {
+      "version": "file:../common-files"
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -5078,6 +7515,16 @@
         "graceful-fs": "^4.1.2",
         "jsonfile": "^4.0.0",
         "universalify": "^0.1.0"
+      },
+      "dependencies": {
+        "jsonfile": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
+          "integrity": "sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=",
+          "requires": {
+            "graceful-fs": "^4.1.6"
+          }
+        }
       }
     },
     "fs-minipass": {
@@ -5697,11 +8144,19 @@
       }
     },
     "jsonfile": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
-      "integrity": "sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=",
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-6.1.0.tgz",
+      "integrity": "sha512-5dgndWOriYSm5cnYaJNhalLNDKOqFwyDB/rr1E9ZsGciGvKPs8R2xYGCacuf3z6K1YKDz182fd+fY3cn3pMqXQ==",
       "requires": {
-        "graceful-fs": "^4.1.6"
+        "graceful-fs": "^4.1.6",
+        "universalify": "^2.0.0"
+      },
+      "dependencies": {
+        "universalify": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.0.tgz",
+          "integrity": "sha512-hAZsKq7Yy11Zu1DE0OzWjw7nnLZmJZYTDZZyEFHZdUhV8FkH5MCfoU1XMaxXovpyW5nq5scPqq0ZDP9Zyl04oQ=="
+        }
       }
     },
     "jsprim": {
@@ -6810,6 +9265,14 @@
       "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
       "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM="
     },
+    "string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "requires": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
@@ -6838,14 +9301,6 @@
         "define-properties": "^1.1.3"
       }
     },
-    "string_decoder": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
-      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
-      "requires": {
-        "safe-buffer": "~5.2.0"
-      }
-    },
     "strip-ansi": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
diff --git a/nightfall-optimist/package.json b/nightfall-optimist/package.json
index 34ae1c30d..b4e751259 100644
--- a/nightfall-optimist/package.json
+++ b/nightfall-optimist/package.json
@@ -40,6 +40,7 @@
     "express-fileupload": "^1.1.7-alpha.4",
     "general-number": "^1.0.1",
     "hex-to-binary": "^1.0.1",
+    "jsonfile": "^6.1.0",
     "keccak": "^3.0.1",
     "mongodb": "^3.6.3",
     "queue": "^6.0.2",
diff --git a/nightfall-optimist/src/services/transaction-checker.mjs b/nightfall-optimist/src/services/transaction-checker.mjs
index 111fa5f4b..591484f2d 100644
--- a/nightfall-optimist/src/services/transaction-checker.mjs
+++ b/nightfall-optimist/src/services/transaction-checker.mjs
@@ -7,7 +7,6 @@ Here are the things that could be wrong with a transaction:
 - the public inputs hash is correct
 */
 import config from 'config';
-import axios from 'axios';
 import gen from 'general-number';
 import logger from 'common-files/utils/logger.mjs';
 import {
@@ -19,10 +18,10 @@ import {
 } from '../classes/index.mjs';
 import { waitForContract } from '../event-handlers/subscribe.mjs';
 import { getBlockByBlockNumberL2 } from './database.mjs';
+import verify from './verify.mjs';
 
-const { ZOKRATES_WORKER_HOST, PROVING_SCHEME, BACKEND, CURVE, ZERO, CHALLENGES_CONTRACT_NAME } =
-  config;
 const { generalise } = gen;
+const { PROVING_SCHEME, BACKEND, CURVE, ZERO, CHALLENGES_CONTRACT_NAME } = config;
 
 // first, let's check the hash. That's nice and easy:
 // NB as we actually now comput the hash on receipt of the transaction this
@@ -208,7 +207,7 @@ async function verifyProof(transaction) {
     default:
       throw new TransactionError('Unknown transaction type', 2);
   }
-  const res = await axios.post(`http://${ZOKRATES_WORKER_HOST}/verify`, {
+  const res = await verify({
     vk: new VerificationKey(vkArray),
     proof: new Proof(transaction.proof),
     provingScheme: PROVING_SCHEME,
@@ -216,8 +215,7 @@ async function verifyProof(transaction) {
     curve: CURVE,
     inputs: inputs.all.hex(32),
   });
-  const { verifies } = res.data;
-  if (!verifies) throw new TransactionError('The proof did not verify', 4);
+  if (!res) throw new TransactionError('The proof did not verify', 4);
 }
 
 async function checkTransaction(transaction) {
diff --git a/nightfall-optimist/src/services/verify.mjs b/nightfall-optimist/src/services/verify.mjs
new file mode 100644
index 000000000..55f0c8855
--- /dev/null
+++ b/nightfall-optimist/src/services/verify.mjs
@@ -0,0 +1,85 @@
+import childProcess from 'child_process';
+import jsonfile from 'jsonfile';
+import fs from 'fs';
+
+const { spawn } = childProcess;
+const { writeFile } = jsonfile;
+
+const deleteSingleFile = fileName => {
+  fs.unlink(fileName, err => {
+    if (err) throw err;
+  });
+};
+
+/**
+ * Takes in a proof and a verification key and determines if the proof verifies.
+ *
+ * @param {String} provingScheme - Available options are 'g16', 'pghr13', 'gm17'
+ * @param {String} backEnd - Available options are 'libsnark', 'bellman', 'ark'
+ * @param {Object} [options] - Options for output
+ * @param {Boolean} options.createFile - Whether or not to output a json file
+ * @param {String} [options.directory=./] - Directory to output files in
+ * @param {String} [options.fileName=proof.json] - Name of JSON proof file ()
+ */
+export default async function verify({
+  vk,
+  proof,
+  inputs,
+  provingScheme = 'g16',
+  backend = 'bellman',
+  curve = 'bn128',
+}) {
+  // we've provided a json proof and a verifying key but Zokrates needs to read
+  // these from a file. Thus we should write them to temporary unique files.
+  // Note: Math.random is used to create unique filename to avoid error at concurrent execution.
+  let combinedProof;
+  if (!proof.inputs) combinedProof = { proof, inputs };
+  else combinedProof = proof;
+  const proofTempFile = `/tmp/proof-${Math.random()}-${Math.random()}.json`;
+  const vkTempFile = `/tmp/verify-${Math.random()}-${Math.random()}.key`;
+  await Promise.all([writeFile(vkTempFile, vk), writeFile(proofTempFile, combinedProof)]);
+
+  const args = [
+    'verify',
+    '-v',
+    vkTempFile,
+    '-j',
+    proofTempFile,
+    '--proving-scheme',
+    provingScheme,
+    '--backend',
+    backend,
+    '--curve',
+    curve,
+  ];
+
+  return new Promise((resolve, reject) => {
+    const zokrates = spawn('/app/zokrates', args, {
+      stdio: ['ignore', 'pipe', 'pipe'],
+      env: {
+        ZOKRATES_STDLIB: process.env.ZOKRATES_STDLIB,
+      },
+    });
+
+    let output = '';
+    zokrates.stdout.on('data', data => {
+      output += data.toString('utf8');
+    });
+
+    zokrates.stderr.on('data', err => {
+      reject(new Error(`Verify failed: ${err}`));
+    });
+
+    zokrates.on('close', () => {
+      // we no longer need the temporary files
+      deleteSingleFile(proofTempFile);
+      deleteSingleFile(vkTempFile);
+      // ZoKrates sometimes outputs error through stdout instead of stderr,
+      // so we need to catch those errors manually.
+      if (output.includes('panicked')) reject(new Error(output.slice(output.indexOf('panicked'))));
+
+      if (output.includes('PASS')) resolve(true);
+      else resolve(false);
+    });
+  });
+}
diff --git a/optimist.Dockerfile b/optimist.Dockerfile
index c2e639fc9..23efae3ba 100644
--- a/optimist.Dockerfile
+++ b/optimist.Dockerfile
@@ -1,3 +1,6 @@
+# install zokrates for local verify
+FROM zokrates/zokrates:0.7.7 as builder
+
 FROM mongo:4.4.1-bionic
 
 # install node
@@ -10,6 +13,8 @@ RUN apt-get install -y curl
 RUN curl -sL https://deb.nodesource.com/setup_14.x | bash -
 RUN apt-get install -y nodejs
 RUN apt-get install -y netcat
+# installs libs required for zokrates
+RUN apt-get install -y libgmpxx4ldbl libgmp3-dev
 
 WORKDIR /
 COPY common-files common-files
@@ -20,6 +25,11 @@ RUN mkdir /app/mongodb
 
 COPY nightfall-optimist/src src
 COPY nightfall-optimist/docker-entrypoint.sh nightfall-optimist/pre-start-script.sh nightfall-optimist/package*.json ./
+COPY --from=builder /home/zokrates/.zokrates/bin/zokrates /app/zokrates
+COPY --from=builder /home/zokrates/.zokrates/stdlib /app/stdlib/
+
+ENV ZOKRATES_HOME /app
+ENV ZOKRATES_STDLIB /app/stdlib
 
 RUN npm ci