diff --git a/.nvmrc b/.nvmrc
index 3f62891e..d55a2ad2 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-v8.12
+v10.15
diff --git a/Dockerfile b/Dockerfile
index fa17c40f..f7d3a54f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:8 as build-deps
+FROM node:10 as build-deps
 
 WORKDIR /bridge
 COPY package.json .
diff --git a/package-lock.json b/package-lock.json
index ec991e70..723f27a1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4310,8 +4310,7 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -4329,13 +4328,11 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
-          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -4348,18 +4345,15 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -4462,8 +4456,7 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "ini": {
           "version": "1.3.5",
@@ -4473,7 +4466,6 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
-          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -4486,20 +4478,17 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
-          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
-          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -4516,7 +4505,6 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
-          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4589,8 +4577,7 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -4600,7 +4587,6 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
-          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -4676,8 +4662,7 @@
         },
         "safe-buffer": {
           "version": "5.1.2",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -4707,7 +4692,6 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
-          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -4725,7 +4709,6 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
-          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -4764,13 +4747,11 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         },
         "yallist": {
           "version": "3.0.3",
-          "bundled": true,
-          "optional": true
+          "bundled": true
         }
       }
     },
@@ -8023,4163 +8004,6 @@
         "sort-keys": "^1.0.0"
       }
     },
-    "npm": {
-      "version": "5.10.0",
-      "resolved": "https://registry.npmjs.org/npm/-/npm-5.10.0.tgz",
-      "integrity": "sha512-lvjvjgR5wG2RJ2uqak1xtZcVAWMwVOzN5HkUlUj/n8rU1f3A0fNn+7HwOzH9Lyf0Ppyu9ApgsEpHczOSnx1cwA==",
-      "requires": {
-        "JSONStream": "^1.3.2",
-        "abbrev": "~1.1.1",
-        "ansi-regex": "~3.0.0",
-        "ansicolors": "~0.3.2",
-        "ansistyles": "~0.1.3",
-        "aproba": "~1.2.0",
-        "archy": "~1.0.0",
-        "bin-links": "^1.1.0",
-        "bluebird": "~3.5.1",
-        "byte-size": "^4.0.2",
-        "cacache": "^10.0.4",
-        "call-limit": "~1.1.0",
-        "chownr": "~1.0.1",
-        "cli-columns": "^3.1.2",
-        "cli-table2": "~0.2.0",
-        "cmd-shim": "~2.0.2",
-        "columnify": "~1.5.4",
-        "config-chain": "~1.1.11",
-        "debuglog": "*",
-        "detect-indent": "~5.0.0",
-        "detect-newline": "^2.1.0",
-        "dezalgo": "~1.0.3",
-        "editor": "~1.0.0",
-        "find-npm-prefix": "^1.0.2",
-        "fs-vacuum": "~1.2.10",
-        "fs-write-stream-atomic": "~1.0.10",
-        "gentle-fs": "^2.0.1",
-        "glob": "~7.1.2",
-        "graceful-fs": "~4.1.11",
-        "has-unicode": "~2.0.1",
-        "hosted-git-info": "^2.6.0",
-        "iferr": "~0.1.5",
-        "imurmurhash": "*",
-        "inflight": "~1.0.6",
-        "inherits": "~2.0.3",
-        "ini": "^1.3.5",
-        "init-package-json": "^1.10.3",
-        "is-cidr": "~1.0.0",
-        "json-parse-better-errors": "^1.0.2",
-        "lazy-property": "~1.0.0",
-        "libcipm": "^1.6.2",
-        "libnpx": "^10.2.0",
-        "lock-verify": "^2.0.2",
-        "lockfile": "^1.0.4",
-        "lodash._baseindexof": "*",
-        "lodash._baseuniq": "~4.6.0",
-        "lodash._bindcallback": "*",
-        "lodash._cacheindexof": "*",
-        "lodash._createcache": "*",
-        "lodash._getnative": "*",
-        "lodash.clonedeep": "~4.5.0",
-        "lodash.restparam": "*",
-        "lodash.union": "~4.6.0",
-        "lodash.uniq": "~4.5.0",
-        "lodash.without": "~4.4.0",
-        "lru-cache": "^4.1.2",
-        "meant": "~1.0.1",
-        "mississippi": "^3.0.0",
-        "mkdirp": "~0.5.1",
-        "move-concurrently": "^1.0.1",
-        "node-gyp": "^3.6.2",
-        "nopt": "~4.0.1",
-        "normalize-package-data": "~2.4.0",
-        "npm-audit-report": "^1.0.9",
-        "npm-cache-filename": "~1.0.2",
-        "npm-install-checks": "~3.0.0",
-        "npm-lifecycle": "^2.0.1",
-        "npm-package-arg": "^6.1.0",
-        "npm-packlist": "~1.1.10",
-        "npm-profile": "^3.0.1",
-        "npm-registry-client": "^8.5.1",
-        "npm-registry-fetch": "^1.1.0",
-        "npm-user-validate": "~1.0.0",
-        "npmlog": "~4.1.2",
-        "once": "~1.4.0",
-        "opener": "~1.4.3",
-        "osenv": "^0.1.5",
-        "pacote": "^7.6.1",
-        "path-is-inside": "~1.0.2",
-        "promise-inflight": "~1.0.1",
-        "qrcode-terminal": "^0.12.0",
-        "query-string": "^6.1.0",
-        "qw": "~1.0.1",
-        "read": "~1.0.7",
-        "read-cmd-shim": "~1.0.1",
-        "read-installed": "~4.0.3",
-        "read-package-json": "^2.0.13",
-        "read-package-tree": "^5.2.1",
-        "readable-stream": "^2.3.6",
-        "readdir-scoped-modules": "*",
-        "request": "^2.85.0",
-        "retry": "^0.12.0",
-        "rimraf": "~2.6.2",
-        "safe-buffer": "^5.1.2",
-        "semver": "^5.5.0",
-        "sha": "~2.0.1",
-        "slide": "~1.1.6",
-        "sorted-object": "~2.0.1",
-        "sorted-union-stream": "~2.1.3",
-        "ssri": "^5.3.0",
-        "strip-ansi": "~4.0.0",
-        "tar": "^4.4.2",
-        "text-table": "~0.2.0",
-        "tiny-relative-date": "^1.3.0",
-        "uid-number": "0.0.6",
-        "umask": "~1.1.0",
-        "unique-filename": "~1.1.0",
-        "unpipe": "~1.0.0",
-        "update-notifier": "^2.5.0",
-        "uuid": "^3.2.1",
-        "validate-npm-package-license": "^3.0.3",
-        "validate-npm-package-name": "~3.0.0",
-        "which": "~1.3.0",
-        "worker-farm": "^1.6.0",
-        "wrappy": "~1.0.2",
-        "write-file-atomic": "^2.3.0"
-      },
-      "dependencies": {
-        "JSONStream": {
-          "version": "1.3.2",
-          "bundled": true,
-          "requires": {
-            "jsonparse": "^1.2.0",
-            "through": ">=2.2.7 <3"
-          },
-          "dependencies": {
-            "jsonparse": {
-              "version": "1.3.1",
-              "bundled": true
-            },
-            "through": {
-              "version": "2.3.8",
-              "bundled": true
-            }
-          }
-        },
-        "abbrev": {
-          "version": "1.1.1",
-          "bundled": true
-        },
-        "ansi-regex": {
-          "version": "3.0.0",
-          "bundled": true
-        },
-        "ansicolors": {
-          "version": "0.3.2",
-          "bundled": true
-        },
-        "ansistyles": {
-          "version": "0.1.3",
-          "bundled": true
-        },
-        "aproba": {
-          "version": "1.2.0",
-          "bundled": true
-        },
-        "archy": {
-          "version": "1.0.0",
-          "bundled": true
-        },
-        "bin-links": {
-          "version": "1.1.0",
-          "bundled": true,
-          "requires": {
-            "bluebird": "^3.5.0",
-            "cmd-shim": "^2.0.2",
-            "fs-write-stream-atomic": "^1.0.10",
-            "gentle-fs": "^2.0.0",
-            "graceful-fs": "^4.1.11",
-            "slide": "^1.1.6"
-          }
-        },
-        "bluebird": {
-          "version": "3.5.1",
-          "bundled": true
-        },
-        "byte-size": {
-          "version": "4.0.2",
-          "bundled": true
-        },
-        "cacache": {
-          "version": "10.0.4",
-          "bundled": true,
-          "requires": {
-            "bluebird": "^3.5.1",
-            "chownr": "^1.0.1",
-            "glob": "^7.1.2",
-            "graceful-fs": "^4.1.11",
-            "lru-cache": "^4.1.1",
-            "mississippi": "^2.0.0",
-            "mkdirp": "^0.5.1",
-            "move-concurrently": "^1.0.1",
-            "promise-inflight": "^1.0.1",
-            "rimraf": "^2.6.2",
-            "ssri": "^5.2.4",
-            "unique-filename": "^1.1.0",
-            "y18n": "^4.0.0"
-          },
-          "dependencies": {
-            "mississippi": {
-              "version": "2.0.0",
-              "bundled": true,
-              "requires": {
-                "concat-stream": "^1.5.0",
-                "duplexify": "^3.4.2",
-                "end-of-stream": "^1.1.0",
-                "flush-write-stream": "^1.0.0",
-                "from2": "^2.1.0",
-                "parallel-transform": "^1.1.0",
-                "pump": "^2.0.1",
-                "pumpify": "^1.3.3",
-                "stream-each": "^1.1.0",
-                "through2": "^2.0.0"
-              },
-              "dependencies": {
-                "concat-stream": {
-                  "version": "1.6.1",
-                  "bundled": true,
-                  "requires": {
-                    "inherits": "^2.0.3",
-                    "readable-stream": "^2.2.2",
-                    "typedarray": "^0.0.6"
-                  },
-                  "dependencies": {
-                    "typedarray": {
-                      "version": "0.0.6",
-                      "bundled": true
-                    }
-                  }
-                },
-                "duplexify": {
-                  "version": "3.5.4",
-                  "bundled": true,
-                  "requires": {
-                    "end-of-stream": "^1.0.0",
-                    "inherits": "^2.0.1",
-                    "readable-stream": "^2.0.0",
-                    "stream-shift": "^1.0.0"
-                  },
-                  "dependencies": {
-                    "stream-shift": {
-                      "version": "1.0.0",
-                      "bundled": true
-                    }
-                  }
-                },
-                "end-of-stream": {
-                  "version": "1.4.1",
-                  "bundled": true,
-                  "requires": {
-                    "once": "^1.4.0"
-                  }
-                },
-                "flush-write-stream": {
-                  "version": "1.0.2",
-                  "bundled": true,
-                  "requires": {
-                    "inherits": "^2.0.1",
-                    "readable-stream": "^2.0.4"
-                  }
-                },
-                "from2": {
-                  "version": "2.3.0",
-                  "bundled": true,
-                  "requires": {
-                    "inherits": "^2.0.1",
-                    "readable-stream": "^2.0.0"
-                  }
-                },
-                "parallel-transform": {
-                  "version": "1.1.0",
-                  "bundled": true,
-                  "requires": {
-                    "cyclist": "~0.2.2",
-                    "inherits": "^2.0.3",
-                    "readable-stream": "^2.1.5"
-                  },
-                  "dependencies": {
-                    "cyclist": {
-                      "version": "0.2.2",
-                      "bundled": true
-                    }
-                  }
-                },
-                "pump": {
-                  "version": "2.0.1",
-                  "bundled": true,
-                  "requires": {
-                    "end-of-stream": "^1.1.0",
-                    "once": "^1.3.1"
-                  }
-                },
-                "pumpify": {
-                  "version": "1.4.0",
-                  "bundled": true,
-                  "requires": {
-                    "duplexify": "^3.5.3",
-                    "inherits": "^2.0.3",
-                    "pump": "^2.0.0"
-                  }
-                },
-                "stream-each": {
-                  "version": "1.2.2",
-                  "bundled": true,
-                  "requires": {
-                    "end-of-stream": "^1.1.0",
-                    "stream-shift": "^1.0.0"
-                  },
-                  "dependencies": {
-                    "stream-shift": {
-                      "version": "1.0.0",
-                      "bundled": true
-                    }
-                  }
-                },
-                "through2": {
-                  "version": "2.0.3",
-                  "bundled": true,
-                  "requires": {
-                    "readable-stream": "^2.1.5",
-                    "xtend": "~4.0.1"
-                  },
-                  "dependencies": {
-                    "xtend": {
-                      "version": "4.0.1",
-                      "bundled": true
-                    }
-                  }
-                }
-              }
-            },
-            "y18n": {
-              "version": "4.0.0",
-              "bundled": true
-            }
-          }
-        },
-        "call-limit": {
-          "version": "1.1.0",
-          "bundled": true
-        },
-        "chownr": {
-          "version": "1.0.1",
-          "bundled": true
-        },
-        "cli-columns": {
-          "version": "3.1.2",
-          "bundled": true,
-          "requires": {
-            "string-width": "^2.0.0",
-            "strip-ansi": "^3.0.1"
-          },
-          "dependencies": {
-            "string-width": {
-              "version": "2.1.1",
-              "bundled": true,
-              "requires": {
-                "is-fullwidth-code-point": "^2.0.0",
-                "strip-ansi": "^4.0.0"
-              },
-              "dependencies": {
-                "is-fullwidth-code-point": {
-                  "version": "2.0.0",
-                  "bundled": true
-                },
-                "strip-ansi": {
-                  "version": "4.0.0",
-                  "bundled": true,
-                  "requires": {
-                    "ansi-regex": "^3.0.0"
-                  }
-                }
-              }
-            },
-            "strip-ansi": {
-              "version": "3.0.1",
-              "bundled": true,
-              "requires": {
-                "ansi-regex": "^2.0.0"
-              },
-              "dependencies": {
-                "ansi-regex": {
-                  "version": "2.1.1",
-                  "bundled": true
-                }
-              }
-            }
-          }
-        },
-        "cli-table2": {
-          "version": "0.2.0",
-          "bundled": true,
-          "requires": {
-            "colors": "^1.1.2",
-            "lodash": "^3.10.1",
-            "string-width": "^1.0.1"
-          },
-          "dependencies": {
-            "colors": {
-              "version": "1.1.2",
-              "bundled": true,
-              "optional": true
-            },
-            "lodash": {
-              "version": "3.10.1",
-              "bundled": true
-            },
-            "string-width": {
-              "version": "1.0.2",
-              "bundled": true,
-              "requires": {
-                "code-point-at": "^1.0.0",
-                "is-fullwidth-code-point": "^1.0.0",
-                "strip-ansi": "^3.0.0"
-              },
-              "dependencies": {
-                "code-point-at": {
-                  "version": "1.1.0",
-                  "bundled": true
-                },
-                "is-fullwidth-code-point": {
-                  "version": "1.0.0",
-                  "bundled": true,
-                  "requires": {
-                    "number-is-nan": "^1.0.0"
-                  },
-                  "dependencies": {
-                    "number-is-nan": {
-                      "version": "1.0.1",
-                      "bundled": true
-                    }
-                  }
-                },
-                "strip-ansi": {
-                  "version": "3.0.1",
-                  "bundled": true,
-                  "requires": {
-                    "ansi-regex": "^2.0.0"
-                  },
-                  "dependencies": {
-                    "ansi-regex": {
-                      "version": "2.1.1",
-                      "bundled": true
-                    }
-                  }
-                }
-              }
-            }
-          }
-        },
-        "cmd-shim": {
-          "version": "2.0.2",
-          "bundled": true,
-          "requires": {
-            "graceful-fs": "^4.1.2",
-            "mkdirp": "~0.5.0"
-          }
-        },
-        "columnify": {
-          "version": "1.5.4",
-          "bundled": true,
-          "requires": {
-            "strip-ansi": "^3.0.0",
-            "wcwidth": "^1.0.0"
-          },
-          "dependencies": {
-            "strip-ansi": {
-              "version": "3.0.1",
-              "bundled": true,
-              "requires": {
-                "ansi-regex": "^2.0.0"
-              },
-              "dependencies": {
-                "ansi-regex": {
-                  "version": "2.1.1",
-                  "bundled": true
-                }
-              }
-            },
-            "wcwidth": {
-              "version": "1.0.1",
-              "bundled": true,
-              "requires": {
-                "defaults": "^1.0.3"
-              },
-              "dependencies": {
-                "defaults": {
-                  "version": "1.0.3",
-                  "bundled": true,
-                  "requires": {
-                    "clone": "^1.0.2"
-                  },
-                  "dependencies": {
-                    "clone": {
-                      "version": "1.0.2",
-                      "bundled": true
-                    }
-                  }
-                }
-              }
-            }
-          }
-        },
-        "config-chain": {
-          "version": "1.1.11",
-          "bundled": true,
-          "requires": {
-            "ini": "^1.3.4",
-            "proto-list": "~1.2.1"
-          },
-          "dependencies": {
-            "proto-list": {
-              "version": "1.2.4",
-              "bundled": true
-            }
-          }
-        },
-        "debuglog": {
-          "version": "1.0.1",
-          "bundled": true
-        },
-        "detect-indent": {
-          "version": "5.0.0",
-          "bundled": true
-        },
-        "detect-newline": {
-          "version": "2.1.0",
-          "bundled": true
-        },
-        "dezalgo": {
-          "version": "1.0.3",
-          "bundled": true,
-          "requires": {
-            "asap": "^2.0.0",
-            "wrappy": "1"
-          },
-          "dependencies": {
-            "asap": {
-              "version": "2.0.5",
-              "bundled": true
-            }
-          }
-        },
-        "editor": {
-          "version": "1.0.0",
-          "bundled": true
-        },
-        "find-npm-prefix": {
-          "version": "1.0.2",
-          "bundled": true
-        },
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-                "spdx-license-ids": "^3.0.0"
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-                  "bundled": true
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-        "validate-npm-package-name": {
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-          "bundled": true,
-          "requires": {
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-          },
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-              "bundled": true
-            }
-          }
-        },
-        "which": {
-          "version": "1.3.0",
-          "bundled": true,
-          "requires": {
-            "isexe": "^2.0.0"
-          },
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-              "version": "2.0.0",
-              "bundled": true
-            }
-          }
-        },
-        "worker-farm": {
-          "version": "1.6.0",
-          "bundled": true,
-          "requires": {
-            "errno": "~0.1.7"
-          },
-          "dependencies": {
-            "errno": {
-              "version": "0.1.7",
-              "bundled": true,
-              "requires": {
-                "prr": "~1.0.1"
-              },
-              "dependencies": {
-                "prr": {
-                  "version": "1.0.1",
-                  "bundled": true
-                }
-              }
-            }
-          }
-        },
-        "wrappy": {
-          "version": "1.0.2",
-          "bundled": true
-        },
-        "write-file-atomic": {
-          "version": "2.3.0",
-          "bundled": true,
-          "requires": {
-            "graceful-fs": "^4.1.11",
-            "imurmurhash": "^0.1.4",
-            "signal-exit": "^3.0.2"
-          },
-          "dependencies": {
-            "signal-exit": {
-              "version": "3.0.2",
-              "bundled": true
-            }
-          }
-        }
-      }
-    },
     "npm-run-path": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/npm-run-path/-/npm-run-path-2.0.2.tgz",
@@ -16991,7 +12815,7 @@
       "requires": {
         "underscore": "1.8.3",
         "web3-core-helpers": "1.0.0-beta.30",
-        "websocket": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible"
+        "websocket": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2"
       }
     },
     "web3-shh": {
diff --git a/package.json b/package.json
index bd497175..182951e1 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,6 @@
     "mocha": "^5.1.1",
     "node-sass-chokidar": "^1.0.1",
     "nodemon": "^1.17.1",
-    "npm": "^5.7.1",
     "numeral": "^2.0.6",
     "react": "^16.2.0",
     "react-app-rewire-mobx": "^1.0.7",
diff --git a/submodules/poa-bridge-contracts b/submodules/poa-bridge-contracts
index 0f15d7f1..b117b217 160000
--- a/submodules/poa-bridge-contracts
+++ b/submodules/poa-bridge-contracts
@@ -1 +1 @@
-Subproject commit 0f15d7f108647bdc458c96a8a0cc1f51468c0e12
+Subproject commit b117b217288343bad3a790ba3348a2005df4a094