diff --git a/package-lock.json b/package-lock.json
index e36db01..1a62d26 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -64,6 +64,24 @@
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+      "dev": true,
+      "requires": {
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       "resolved": "https://registry.npmjs.org/@types/semver/-/semver-5.5.0.tgz",
@@ -927,6 +945,15 @@
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       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
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+      "resolved": "https://registry.npmjs.org/base-x/-/base-x-3.0.9.tgz",
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+      "dev": true,
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@@ -996,6 +1023,12 @@
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@@ -1143,6 +1176,26 @@
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+      "resolved": "https://registry.npmjs.org/bs58/-/bs58-4.0.1.tgz",
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+      "dev": true,
+      "requires": {
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+    "bs58check": {
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+      "resolved": "https://registry.npmjs.org/bs58check/-/bs58check-2.1.2.tgz",
+      "integrity": "sha512-0TS1jicxdU09dwJMNZtVAfzPi6Q6QeN0pM1Fkzrjn+XYHvzMKPU3pHVpva+769iNVSfIYWf7LJ6WR+BuuMf8cA==",
+      "dev": true,
+      "requires": {
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@@ -2022,6 +2075,63 @@
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+          "dev": true,
+          "requires": {
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+            "brorand": "^1.1.0",
+            "hash.js": "^1.0.0",
+            "hmac-drbg": "^1.0.1",
+            "inherits": "^2.0.4",
+            "minimalistic-assert": "^1.0.1",
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+              "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
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+              "dev": true
+            }
+          }
+        },
+        "ethereumjs-abi": {
+          "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#8431eab7b3384e65e8126a4602520b78031666fb",
+          "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
+          "dev": true,
+          "requires": {
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+            "ethereumjs-util": "^6.0.0"
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+          "dependencies": {
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+              "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-6.2.1.tgz",
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+              "requires": {
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+                "bn.js": "^4.11.0",
+                "create-hash": "^1.1.2",
+                "elliptic": "^6.5.2",
+                "ethereum-cryptography": "^0.1.3",
+                "ethjs-util": "0.1.6",
+                "rlp": "^2.2.3"
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+        },
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+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+          "dev": true
+        }
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     },
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@@ -2048,28 +2158,95 @@
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-      "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
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+      "resolved": "https://registry.npmjs.org/ethereum-cryptography/-/ethereum-cryptography-0.1.3.tgz",
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-        "ethereumjs-util": "^6.0.0"
+        "@types/pbkdf2": "^3.0.0",
+        "@types/secp256k1": "^4.0.1",
+        "blakejs": "^1.1.0",
+        "browserify-aes": "^1.2.0",
+        "bs58check": "^2.1.2",
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+        "randombytes": "^2.1.0",
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+        },
+        "elliptic": {
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+          "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.4.tgz",
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-            "rlp": "^2.0.0",
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+            "brorand": "^1.1.0",
+            "hash.js": "^1.0.0",
+            "hmac-drbg": "^1.0.1",
+            "inherits": "^2.0.4",
+            "minimalistic-assert": "^1.0.1",
+            "minimalistic-crypto-utils": "^1.0.1"
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+              "dev": true
+            }
+          }
+        },
+        "keccak": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/keccak/-/keccak-3.0.2.tgz",
+          "integrity": "sha512-PyKKjkH53wDMLGrvmRGSNWgmSxZOUqbnXwKL9tmgbFYA1iAYqW21kfR7mZXV0MlESiefxQQE9X9fTa3X+2MPDQ==",
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+          "requires": {
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+            "node-gyp-build": "^4.2.0",
+            "readable-stream": "^3.6.0"
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+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
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+          "dev": true,
+          "requires": {
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+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
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+          "resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-3.0.1.tgz",
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+          "dev": true
+        },
+        "secp256k1": {
+          "version": "4.0.3",
+          "resolved": "https://registry.npmjs.org/secp256k1/-/secp256k1-4.0.3.tgz",
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+          "requires": {
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@@ -3808,12 +3985,24 @@
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+      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-2.0.2.tgz",
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+      "dev": true
+    },
     "node-fetch": {
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       "integrity": "sha1-q4hOjn5X44qUR1POxwb3iNF2i7U=",
       "dev": true
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+    "node-gyp-build": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-4.5.0.tgz",
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@@ -4928,9 +5117,9 @@
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-      "integrity": "sha1-5p44obq+lpsBCCB5eLn2K4hgSDk=",
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
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@@ -5585,6 +5774,26 @@
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+      },
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+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "websocket": {
+          "version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
+          "from": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible",
+          "requires": {
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+            "nan": "^2.3.3",
+            "typedarray-to-buffer": "^3.1.2",
+            "yaeti": "^0.0.6"
+          }
+        }
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     },
     "web3-shh": {
@@ -5619,26 +5828,6 @@
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-      "version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
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