diff --git a/examples/lib-complex/package-lock.json b/examples/lib-complex/package-lock.json
index 5ee25f826..4c0016846 100644
--- a/examples/lib-complex/package-lock.json
+++ b/examples/lib-complex/package-lock.json
@@ -27,9 +27,9 @@
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-        "slash": "^1.0.0",
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+        "convert-source-map": "1.5.1",
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+        "json5": "0.5.1",
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-        "babel-runtime": "^6.22.0",
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@@ -249,7 +249,7 @@
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@@ -258,7 +258,7 @@
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@@ -315,9 +315,9 @@
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@@ -326,9 +326,9 @@
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@@ -371,7 +371,7 @@
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@@ -420,7 +420,7 @@
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-        "pinkie-promise": "^2.0.0",
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-        "pify": "^2.0.0",
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-        "path-type": "^1.0.0"
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-        "read-pkg": "^1.0.0"
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@@ -1455,9 +1454,9 @@
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-        "babel-types": "^6.19.0",
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@@ -1466,9 +1465,9 @@
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-        "regjsparser": "^0.1.4"
+        "regenerate": "1.4.0",
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@@ -1483,7 +1482,7 @@
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       "dev": true,
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+        "jsesc": "0.5.0"
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@@ -1492,7 +1491,7 @@
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+        "is-finite": "1.0.2"
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@@ -1515,7 +1514,7 @@
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@@ -1539,11 +1538,11 @@
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-        "memorystream": "^0.3.1",
-        "require-from-string": "^1.1.0",
-        "semver": "^5.3.0",
-        "yargs": "^4.7.1"
+        "fs-extra": "0.30.0",
+        "memorystream": "0.3.1",
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+        "semver": "5.5.0",
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@@ -1558,7 +1557,7 @@
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@@ -1566,8 +1565,8 @@
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-        "spdx-license-ids": "^3.0.0"
+        "spdx-expression-parse": "3.0.0",
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@@ -1580,8 +1579,8 @@
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-        "spdx-exceptions": "^2.1.0",
-        "spdx-license-ids": "^3.0.0"
+        "spdx-exceptions": "2.1.0",
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@@ -1594,9 +1593,9 @@
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-        "is-fullwidth-code-point": "^1.0.0",
-        "strip-ansi": "^3.0.0"
+        "code-point-at": "1.1.0",
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@@ -1604,7 +1603,7 @@
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-        "ansi-regex": "^2.0.0"
+        "ansi-regex": "2.1.1"
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@@ -1612,7 +1611,7 @@
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+        "is-utf8": "0.2.1"
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@@ -1638,7 +1637,7 @@
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-        "mocha": "^4.1.0",
+        "mocha": "4.1.0",
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@@ -1654,8 +1653,8 @@
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-        "spdx-correct": "^3.0.0",
-        "spdx-expression-parse": "^3.0.0"
+        "spdx-correct": "3.0.0",
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@@ -1673,8 +1672,8 @@
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-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1"
+        "string-width": "1.0.2",
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@@ -1692,20 +1691,20 @@
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-        "lodash.assign": "^4.0.3",
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-        "string-width": "^1.0.1",
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-        "window-size": "^0.2.0",
-        "y18n": "^3.2.1",
-        "yargs-parser": "^2.4.1"
+        "cliui": "3.2.0",
+        "decamelize": "1.2.0",
+        "get-caller-file": "1.0.2",
+        "lodash.assign": "4.2.0",
+        "os-locale": "1.4.0",
+        "read-pkg-up": "1.0.1",
+        "require-directory": "2.1.1",
+        "require-main-filename": "1.0.1",
+        "set-blocking": "2.0.0",
+        "string-width": "1.0.2",
+        "which-module": "1.0.0",
+        "window-size": "0.2.0",
+        "y18n": "3.2.1",
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@@ -1713,8 +1712,8 @@
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-        "camelcase": "^3.0.0",
-        "lodash.assign": "^4.0.6"
+        "camelcase": "3.0.0",
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diff --git a/packages/lib/package-lock.json b/packages/lib/package-lock.json
index dd4c90cfb..852a8c8b3 100644
--- a/packages/lib/package-lock.json
+++ b/packages/lib/package-lock.json
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-        "debug": "^3.1.0"
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@@ -293,7 +293,7 @@
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@@ -1242,8 +1242,8 @@
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-        "safe-buffer": "^5.1.1"
+        "readable-stream": "2.3.6",
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@@ -1455,15 +1455,15 @@
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@@ -1478,7 +1478,7 @@
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@@ -1486,7 +1486,7 @@
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@@ -1496,9 +1496,9 @@
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-        "preserve": "^0.2.0",
-        "repeat-element": "^1.1.2"
+        "expand-range": "1.8.2",
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@@ -1517,12 +1517,12 @@
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@@ -1530,9 +1530,9 @@
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-        "browserify-des": "^1.0.0",
-        "evp_bytestokey": "^1.0.0"
+        "browserify-aes": "1.1.1",
+        "browserify-des": "1.0.2",
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@@ -1540,10 +1540,10 @@
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+        "cipher-base": "1.0.4",
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@@ -1575,13 +1575,13 @@
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@@ -1598,8 +1598,8 @@
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@@ -1650,15 +1650,15 @@
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+        "align-text": "0.1.4",
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@@ -1726,12 +1726,12 @@
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@@ -1760,9 +1760,9 @@
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-        "supports-color": "^5.3.0"
+        "ansi-styles": "3.2.1",
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@@ -1775,7 +1775,7 @@
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@@ -1797,8 +1797,8 @@
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+        "inherits": "2.0.3",
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@@ -1807,10 +1807,10 @@
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-        "isobject": "^3.0.0",
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+        "arr-union": "3.1.0",
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@@ -1836,7 +1836,7 @@
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@@ -1869,7 +1869,7 @@
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@@ -1884,9 +1884,9 @@
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-        "wrap-ansi": "^2.0.0"
+        "string-width": "1.0.2",
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@@ -1907,7 +1907,7 @@
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@@ -4631,13 +4631,13 @@
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-            "mkdirp": "^0.5.1",
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               "dev": true,
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@@ -4663,8 +4663,8 @@
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@@ -4673,11 +4673,11 @@
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-            "babylon": "^6.18.0",
-            "lodash": "^4.17.4"
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@@ -4686,15 +4686,15 @@
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-            "invariant": "^2.2.2",
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+            "globals": "9.18.0",
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@@ -4714,10 +4714,10 @@
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+            "lodash": "4.17.11",
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@@ -4726,8 +4726,8 @@
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@@ -4742,7 +4742,7 @@
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@@ -4758,7 +4758,7 @@
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@@ -4774,7 +4774,7 @@
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           "dev": true,
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+            "tweetnacl": "0.14.5"
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@@ -4792,11 +4792,11 @@
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-            "safe-buffer": "^5.0.1",
-            "unorm": "^1.3.3"
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@@ -4805,7 +4805,7 @@
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@@ -4815,8 +4815,8 @@
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@@ -4826,7 +4826,7 @@
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@@ -4850,15 +4850,15 @@
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@@ -4879,7 +4879,7 @@
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@@ -4895,12 +4895,12 @@
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-            "inherits": "^2.0.1",
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+            "inherits": "2.0.3",
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@@ -4910,9 +4910,9 @@
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-            "browserify-des": "^1.0.0",
-            "evp_bytestokey": "^1.0.0"
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@@ -4922,10 +4922,10 @@
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-            "inherits": "^2.0.1",
-            "safe-buffer": "^5.1.2"
+            "cipher-base": "1.0.4",
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@@ -4935,8 +4935,8 @@
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-            "randombytes": "^2.0.1"
+            "bn.js": "4.11.8",
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@@ -4945,8 +4945,8 @@
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           "dev": true,
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-            "safe-buffer": "^5.1.1"
+            "js-sha3": "0.6.1",
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@@ -4956,13 +4956,13 @@
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-            "inherits": "^2.0.1",
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+            "browserify-rsa": "4.0.1",
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@@ -4971,8 +4971,8 @@
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-            "electron-to-chromium": "^1.3.47"
+            "caniuse-lite": "1.0.30000939",
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@@ -4982,7 +4982,7 @@
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+            "base-x": "3.0.5"
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@@ -4992,9 +4992,9 @@
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-            "safe-buffer": "^5.1.2"
+            "bs58": "4.0.1",
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@@ -5004,8 +5004,8 @@
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-            "ieee754": "^1.1.4"
+            "base64-js": "1.3.0",
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@@ -5015,8 +5015,8 @@
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@@ -5072,8 +5072,8 @@
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-            "typewise": "^1.0.3"
+            "bytewise-core": "1.2.3",
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@@ -5082,7 +5082,7 @@
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@@ -5091,8 +5091,8 @@
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-            "lru-cache": "^3.2.0"
+            "abstract-leveldown": "2.7.2",
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@@ -5101,7 +5101,7 @@
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+                "xtend": "4.0.1"
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@@ -5130,11 +5130,11 @@
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-            "has-ansi": "^2.0.0",
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-            "supports-color": "^2.0.0"
+            "ansi-styles": "2.2.1",
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@@ -5143,7 +5143,7 @@
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+            "functional-red-black-tree": "1.0.1"
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@@ -5152,8 +5152,8 @@
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-            "safe-buffer": "^5.0.1"
+            "inherits": "2.0.3",
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@@ -5162,9 +5162,9 @@
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-            "strip-ansi": "^3.0.1",
-            "wrap-ansi": "^2.0.0"
+            "string-width": "1.0.2",
+            "strip-ansi": "3.0.1",
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@@ -5186,8 +5186,8 @@
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-            "create-hash": "^1.1.1"
+            "bs58": "2.0.1",
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@@ -5205,7 +5205,7 @@
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-            "delayed-stream": "~1.0.0"
+            "delayed-stream": "1.0.0"
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@@ -5215,7 +5215,7 @@
           "dev": true,
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+            "graceful-readlink": "1.0.1"
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@@ -5230,10 +5230,10 @@
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@@ -5299,8 +5299,8 @@
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@@ -5310,8 +5310,8 @@
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@@ -5320,11 +5320,11 @@
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@@ -5435,7 +5435,7 @@
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@@ -5445,9 +5445,9 @@
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@@ -5594,8 +5594,8 @@
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@@ -5611,7 +5611,7 @@
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@@ -5621,9 +5621,9 @@
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-            "miller-rabin": "^4.0.0",
-            "randombytes": "^2.0.0"
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@@ -5638,9 +5638,9 @@
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-            "create-hmac": "^1.1.4"
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@@ -5656,8 +5656,8 @@
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@@ -5679,13 +5679,13 @@
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@@ -5701,7 +5701,7 @@
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@@ -5743,7 +5743,7 @@
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+            "prr": "1.0.1"
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-            "is-symbol": "^1.0.2"
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-            "pify": "^2.3.0",
-            "tape": "^4.6.3"
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-            "json-rpc-engine": "^3.4.0",
-            "json-rpc-error": "^2.0.0",
-            "tape": "^4.8.0"
+            "cross-fetch": "2.2.3",
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-            "tape": "^4.6.3"
+            "async": "2.6.1",
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@@ -5883,11 +5883,11 @@
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-                "async": "^2.0.1",
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-                "ethereumjs-util": "^5.0.0",
-                "merkle-patricia-tree": "^2.1.2"
+                "ethereumjs-tx": "1.3.7",
+                "ethereumjs-util": "5.2.0",
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@@ -5899,13 +5899,13 @@
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-            "elliptic": "^6.4.0",
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-            "servify": "^0.1.12",
-            "ws": "^3.0.0",
-            "xhr-request-promise": "^0.1.2"
+            "bn.js": "4.11.8",
+            "elliptic": "6.4.1",
+            "keccakjs": "0.2.3",
+            "nano-json-stream-parser": "0.1.2",
+            "servify": "0.1.12",
+            "ws": "3.3.3",
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@@ -5914,8 +5914,8 @@
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           "dev": true,
           "requires": {
-            "json-rpc-random-id": "^1.0.0",
-            "xtend": "^4.0.1"
+            "json-rpc-random-id": "1.0.1",
+            "xtend": "4.0.1"
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@@ -5925,7 +5925,7 @@
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-            "ethereumjs-util": "^5.1.1"
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@@ -5934,19 +5934,19 @@
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-            "ethereumjs-block": "^1.4.1",
-            "ethereumjs-tx": "^1.1.1",
-            "ethereumjs-util": "^5.0.1",
+            "async": "2.6.1",
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+            "clone": "2.1.2",
+            "concat-stream": "1.6.2",
+            "end-of-stream": "1.4.1",
+            "eth-query": "2.1.2",
+            "ethereumjs-block": "1.7.1",
+            "ethereumjs-tx": "1.3.7",
+            "ethereumjs-util": "5.2.0",
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-            "through2": "^2.0.3",
-            "treeify": "^1.0.1",
-            "web3-provider-engine": "^13.3.2"
+            "through2": "2.0.5",
+            "treeify": "1.1.0",
+            "web3-provider-engine": "13.8.0"
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@@ -5956,21 +5956,20 @@
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-                "ethereumjs-tx": "^1.3.3",
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-                "ethjs-util": "^0.1.3",
-                "json-rpc-engine": "^3.6.0",
-                "pify": "^2.3.0",
-                "tape": "^4.6.3"
+                "eth-query": "2.1.2",
+                "ethereumjs-tx": "1.3.7",
+                "ethereumjs-util": "5.2.0",
+                "ethjs-util": "0.1.6",
+                "json-rpc-engine": "3.8.0",
+                "pify": "2.3.0",
+                "tape": "4.10.1"
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                   "version": "github:ahultgren/async-eventemitter#fa06e39e56786ba541c180061dbf2c0a5bbf951c",
-                  "from": "github:ahultgren/async-eventemitter#fa06e39e56786ba541c180061dbf2c0a5bbf951c",
                   "dev": true,
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-                    "async": "^2.4.0"
+                    "async": "2.6.1"
                   }
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@@ -5992,12 +5991,11 @@
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-              "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#d84a96796079c8595a0c78accd1e7709f2277215",
-              "from": "git+https://github.com/ethereumjs/ethereumjs-abi.git",
+              "version": "git+https://github.com/ethereumjs/ethereumjs-abi.git#8431eab7b3384e65e8126a4602520b78031666fb",
               "dev": true,
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-                "ethereumjs-util": "^6.0.0"
+                "bn.js": "4.11.8",
+                "ethereumjs-util": "5.2.0"
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@@ -6006,11 +6004,11 @@
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               "dev": true,
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-                "async": "^2.0.1",
+                "async": "2.6.1",
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-                "ethereumjs-tx": "^1.2.2",
-                "ethereumjs-util": "^5.0.0",
-                "merkle-patricia-tree": "^2.1.2"
+                "ethereumjs-tx": "1.3.7",
+                "ethereumjs-util": "5.2.0",
+                "merkle-patricia-tree": "2.3.1"
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@@ -6019,17 +6017,17 @@
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               "requires": {
-                "async": "^2.1.2",
-                "async-eventemitter": "^0.2.2",
+                "async": "2.6.1",
+                "async-eventemitter": "0.2.4",
                 "ethereum-common": "0.2.0",
-                "ethereumjs-account": "^2.0.3",
-                "ethereumjs-block": "~1.7.0",
-                "ethereumjs-util": "^5.1.3",
-                "fake-merkle-patricia-tree": "^1.0.1",
-                "functional-red-black-tree": "^1.0.1",
-                "merkle-patricia-tree": "^2.1.2",
-                "rustbn.js": "~0.1.1",
-                "safe-buffer": "^5.1.1"
+                "ethereumjs-account": "2.0.5",
+                "ethereumjs-block": "1.7.1",
+                "ethereumjs-util": "5.2.0",
+                "fake-merkle-patricia-tree": "1.0.1",
+                "functional-red-black-tree": "1.0.1",
+                "merkle-patricia-tree": "2.3.1",
+                "rustbn.js": "0.1.2",
+                "safe-buffer": "5.1.2"
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@@ -6038,11 +6036,11 @@
               "integrity": "sha1-8jP/zAjU2n1DLapEl3aYnbHfk/A=",
               "dev": true,
               "requires": {
-                "graceful-fs": "^4.1.2",
-                "jsonfile": "^2.1.0",
-                "klaw": "^1.0.0",
-                "path-is-absolute": "^1.0.0",
-                "rimraf": "^2.2.8"
+                "graceful-fs": "4.1.15",
+                "jsonfile": "2.4.0",
+                "klaw": "1.3.1",
+                "path-is-absolute": "1.0.1",
+                "rimraf": "2.6.3"
               }
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             "pify": {
@@ -6063,11 +6061,11 @@
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-                "memorystream": "^0.3.1",
-                "require-from-string": "^1.1.0",
-                "semver": "^5.3.0",
-                "yargs": "^4.7.1"
+                "fs-extra": "0.30.0",
+                "memorystream": "0.3.1",
+                "require-from-string": "1.2.1",
+                "semver": "5.4.1",
+                "yargs": "4.8.1"
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@@ -6076,25 +6074,25 @@
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-                "async": "^2.5.0",
-                "clone": "^2.0.0",
-                "eth-block-tracker": "^2.2.2",
-                "eth-sig-util": "^1.4.2",
-                "ethereumjs-block": "^1.2.2",
-                "ethereumjs-tx": "^1.2.0",
-                "ethereumjs-util": "^5.1.1",
-                "ethereumjs-vm": "^2.0.2",
-                "fetch-ponyfill": "^4.0.0",
-                "json-rpc-error": "^2.0.0",
-                "json-stable-stringify": "^1.0.1",
-                "promise-to-callback": "^1.0.0",
-                "readable-stream": "^2.2.9",
-                "request": "^2.67.0",
-                "semaphore": "^1.0.3",
-                "solc": "^0.4.2",
-                "tape": "^4.4.0",
-                "xhr": "^2.2.0",
-                "xtend": "^4.0.1"
+                "async": "2.6.1",
+                "clone": "2.1.2",
+                "eth-block-tracker": "2.3.1",
+                "eth-sig-util": "1.4.2",
+                "ethereumjs-block": "1.7.1",
+                "ethereumjs-tx": "1.3.7",
+                "ethereumjs-util": "5.2.0",
+                "ethereumjs-vm": "2.3.4",
+                "fetch-ponyfill": "4.1.0",
+                "json-rpc-error": "2.0.0",
+                "json-stable-stringify": "1.0.1",
+                "promise-to-callback": "1.0.0",
+                "readable-stream": "2.3.6",
+                "request": "2.88.0",
+                "semaphore": "1.1.0",
+                "solc": "0.4.25",
+                "tape": "4.10.1",
+                "xhr": "2.5.0",
+                "xtend": "4.0.1"
               }
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@@ -6111,8 +6109,8 @@
           "integrity": "sha1-WmN+8Wq0NHP6cqKa2QhxQFs/UkE=",
           "dev": true,
           "requires": {
-            "bn.js": "^4.10.0",
-            "ethereumjs-util": "^4.3.0"
+            "bn.js": "4.11.8",
+            "ethereumjs-util": "4.5.0"
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             "ethereumjs-util": {
@@ -6121,11 +6119,11 @@
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               "dev": true,
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-                "bn.js": "^4.8.0",
-                "create-hash": "^1.1.2",
-                "keccakjs": "^0.2.0",
-                "rlp": "^2.0.0",
-                "secp256k1": "^3.0.1"
+                "bn.js": "4.11.8",
+                "create-hash": "1.2.0",
+                "keccakjs": "0.2.3",
+                "rlp": "2.1.0",
+                "secp256k1": "3.6.2"
               }
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@@ -6136,9 +6134,9 @@
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           "requires": {
-            "ethereumjs-util": "^5.0.0",
-            "rlp": "^2.0.0",
-            "safe-buffer": "^5.1.1"
+            "ethereumjs-util": "5.2.0",
+            "rlp": "2.1.0",
+            "safe-buffer": "5.1.2"
           }
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         "ethereumjs-block": {
@@ -6147,11 +6145,11 @@
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           "dev": true,
           "requires": {
-            "async": "^2.0.1",
-            "ethereumjs-common": "^0.6.0",
-            "ethereumjs-tx": "^1.2.2",
-            "ethereumjs-util": "^5.0.0",
-            "merkle-patricia-tree": "^2.1.2"
+            "async": "2.6.1",
+            "ethereumjs-common": "0.6.1",
+            "ethereumjs-tx": "1.3.7",
+            "ethereumjs-util": "5.2.0",
+            "merkle-patricia-tree": "2.3.1"
           }
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         "ethereumjs-common": {
@@ -6166,8 +6164,8 @@
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           "dev": true,
           "requires": {
-            "ethereum-common": "^0.0.18",
-            "ethereumjs-util": "^5.0.0"
+            "ethereum-common": "0.0.18",
+            "ethereumjs-util": "5.2.0"
           }
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         "ethereumjs-util": {
@@ -6176,13 +6174,13 @@
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           "dev": true,
           "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"
+            "bn.js": "4.11.8",
+            "create-hash": "1.2.0",
+            "ethjs-util": "0.1.6",
+            "keccak": "1.4.0",
+            "rlp": "2.1.0",
+            "safe-buffer": "5.1.2",
+            "secp256k1": "3.6.2"
           }
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         "ethereumjs-vm": {
@@ -6191,17 +6189,17 @@
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           "dev": true,
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-            "async": "^2.1.2",
-            "async-eventemitter": "^0.2.2",
-            "ethereumjs-account": "^2.0.3",
-            "ethereumjs-block": "~2.2.0",
-            "ethereumjs-common": "^1.1.0",
-            "ethereumjs-util": "^6.0.0",
-            "fake-merkle-patricia-tree": "^1.0.1",
-            "functional-red-black-tree": "^1.0.1",
-            "merkle-patricia-tree": "^2.3.2",
-            "rustbn.js": "~0.2.0",
-            "safe-buffer": "^5.1.1"
+            "async": "2.6.1",
+            "async-eventemitter": "0.2.4",
+            "ethereumjs-account": "2.0.5",
+            "ethereumjs-block": "2.2.0",
+            "ethereumjs-common": "1.1.0",
+            "ethereumjs-util": "6.1.0",
+            "fake-merkle-patricia-tree": "1.0.1",
+            "functional-red-black-tree": "1.0.1",
+            "merkle-patricia-tree": "2.3.2",
+            "rustbn.js": "0.2.0",
+            "safe-buffer": "5.1.2"
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           "dependencies": {
             "ethereumjs-block": {
@@ -6210,11 +6208,11 @@
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-                "async": "^2.0.1",
-                "ethereumjs-common": "^1.1.0",
-                "ethereumjs-tx": "^1.2.2",
-                "ethereumjs-util": "^5.0.0",
-                "merkle-patricia-tree": "^2.1.2"
+                "async": "2.6.1",
+                "ethereumjs-common": "1.1.0",
+                "ethereumjs-tx": "1.3.7",
+                "ethereumjs-util": "5.2.0",
+                "merkle-patricia-tree": "2.3.2"
               },
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                 "ethereumjs-util": {
@@ -6223,13 +6221,13 @@
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                   "dev": true,
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-                    "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"
+                    "bn.js": "4.11.8",
+                    "create-hash": "1.2.0",
+                    "ethjs-util": "0.1.6",
+                    "keccak": "1.4.0",
+                    "rlp": "2.1.0",
+                    "safe-buffer": "5.1.2",
+                    "secp256k1": "3.6.2"
                   }
                 }
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@@ -6246,13 +6244,13 @@
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               "dev": true,
               "requires": {
-                "bn.js": "^4.11.0",
-                "create-hash": "^1.1.2",
+                "bn.js": "4.11.8",
+                "create-hash": "1.2.0",
                 "ethjs-util": "0.1.6",
-                "keccak": "^1.0.2",
-                "rlp": "^2.0.0",
-                "safe-buffer": "^5.1.1",
-                "secp256k1": "^3.0.1"
+                "keccak": "1.4.0",
+                "rlp": "2.1.0",
+                "safe-buffer": "5.1.2",
+                "secp256k1": "3.6.2"
               }
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             "level-codec": {
@@ -6267,7 +6265,7 @@
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               "dev": true,
               "requires": {
-                "errno": "~0.1.1"
+                "errno": "0.1.7"
               }
             },
             "levelup": {
@@ -6276,13 +6274,13 @@
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               "dev": true,
               "requires": {
-                "deferred-leveldown": "~1.2.1",
-                "level-codec": "~7.0.0",
-                "level-errors": "~1.0.3",
-                "level-iterator-stream": "~1.3.0",
-                "prr": "~1.0.1",
-                "semver": "~5.4.1",
-                "xtend": "~4.0.0"
+                "deferred-leveldown": "1.2.2",
+                "level-codec": "7.0.1",
+                "level-errors": "1.0.5",
+                "level-iterator-stream": "1.3.1",
+                "prr": "1.0.1",
+                "semver": "5.4.1",
+                "xtend": "4.0.1"
               }
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             "merkle-patricia-tree": {
@@ -6291,14 +6289,14 @@
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               "dev": true,
               "requires": {
-                "async": "^1.4.2",
-                "ethereumjs-util": "^5.0.0",
+                "async": "1.5.2",
+                "ethereumjs-util": "5.2.0",
                 "level-ws": "0.0.0",
-                "levelup": "^1.2.1",
-                "memdown": "^1.0.0",
-                "readable-stream": "^2.0.0",
-                "rlp": "^2.0.0",
-                "semaphore": ">=1.0.1"
+                "levelup": "1.3.9",
+                "memdown": "1.4.1",
+                "readable-stream": "2.3.6",
+                "rlp": "2.1.0",
+                "semaphore": "1.1.0"
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@@ -6313,13 +6311,13 @@
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                   "dev": true,
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-                    "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"
+                    "bn.js": "4.11.8",
+                    "create-hash": "1.2.0",
+                    "ethjs-util": "0.1.6",
+                    "keccak": "1.4.0",
+                    "rlp": "2.1.0",
+                    "safe-buffer": "5.1.2",
+                    "secp256k1": "3.6.2"
                   }
                 }
               }
@@ -6333,14 +6331,14 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "aes-js": "^3.1.1",
-            "bs58check": "^2.1.2",
-            "ethereumjs-util": "^5.2.0",
-            "hdkey": "^1.0.0",
-            "safe-buffer": "^5.1.2",
-            "scrypt.js": "^0.2.0",
-            "utf8": "^3.0.0",
-            "uuid": "^3.3.2"
+            "aes-js": "3.1.2",
+            "bs58check": "2.1.2",
+            "ethereumjs-util": "5.2.0",
+            "hdkey": "1.1.1",
+            "safe-buffer": "5.1.2",
+            "scrypt.js": "0.2.1",
+            "utf8": "3.0.0",
+            "uuid": "3.3.2"
           }
         },
         "ethjs-unit": {
@@ -6392,8 +6390,8 @@
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           "dev": true,
           "requires": {
-            "md5.js": "^1.3.4",
-            "safe-buffer": "^5.1.1"
+            "md5.js": "1.3.5",
+            "safe-buffer": "5.1.2"
           }
         },
         "express": {
@@ -6403,36 +6401,36 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "accepts": "~1.3.5",
+            "accepts": "1.3.5",
             "array-flatten": "1.1.1",
             "body-parser": "1.18.3",
             "content-disposition": "0.5.2",
-            "content-type": "~1.0.4",
+            "content-type": "1.0.4",
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-            "checkpoint-store": "^1.1.0"
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@@ -6494,7 +6492,7 @@
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@@ -6503,7 +6501,7 @@
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-            "statuses": "~1.4.0",
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@@ -6572,8 +6570,8 @@
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-            "pinkie-promise": "^2.0.0"
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-            "mz": "^2.6.0",
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@@ -6850,9 +6848,9 @@
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-            "minimalistic-crypto-utils": "^1.0.1"
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@@ -7018,7 +7016,7 @@
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@@ -7060,7 +7058,7 @@
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@@ -7116,8 +7114,8 @@
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-            "promise-to-callback": "^1.0.0",
-            "safe-event-emitter": "^1.0.1"
+            "async": "2.6.1",
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+            "babelify": "7.3.0",
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           "dev": true,
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@@ -7212,7 +7210,7 @@
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-            "graceful-fs": "^4.1.6"
+            "graceful-fs": "4.1.15"
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-            "nan": "^2.2.1",
-            "safe-buffer": "^5.1.0"
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-            "browserify-sha3": "^0.0.4",
-            "sha3": "^1.2.2"
+            "browserify-sha3": "0.0.4",
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@@ -7261,7 +7259,7 @@
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@@ -7270,7 +7268,7 @@
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           "dev": true,
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-            "invert-kv": "^1.0.0"
+            "invert-kv": "1.0.0"
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@@ -7294,10 +7292,10 @@
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-            "readable-stream": "^1.0.33",
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+                "errno": "0.1.7"
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@@ -7315,10 +7313,10 @@
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@@ -8290,9 +8288,9 @@
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@@ -8401,26 +8399,26 @@
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@@ -8456,7 +8454,7 @@
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@@ -8465,7 +8463,7 @@
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-            "inherits": "^2.0.1"
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@@ -8521,7 +8519,7 @@
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@@ -8531,8 +8529,8 @@
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@@ -8542,7 +8540,7 @@
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@@ -8574,7 +8572,7 @@
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@@ -8597,18 +8595,18 @@
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-            "escape-html": "~1.0.3",
-            "etag": "~1.8.1",
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@@ -8637,9 +8635,9 @@
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-            "escape-html": "~1.0.3",
-            "parseurl": "~1.3.2",
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@@ -8650,11 +8648,11 @@
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-            "request": "^2.79.0",
-            "xhr": "^2.3.3"
+            "body-parser": "1.18.3",
+            "cors": "2.8.5",
+            "express": "4.16.4",
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@@ -8689,8 +8687,8 @@
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-            "safe-buffer": "^5.0.1"
+            "inherits": "2.0.3",
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@@ -8716,9 +8714,9 @@
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-            "once": "^1.3.1",
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+            "decompress-response": "3.3.0",
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@@ -8739,8 +8737,8 @@
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-            "source-map": "^0.6.0"
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@@ -8749,8 +8747,8 @@
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-            "spdx-license-ids": "^3.0.0"
+            "spdx-expression-parse": "3.0.0",
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-            "spdx-license-ids": "^3.0.0"
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-            "jsbn": "~0.1.0",
-            "safer-buffer": "^2.0.2",
-            "tweetnacl": "~0.14.0"
+            "asn1": "0.2.4",
+            "assert-plus": "1.0.0",
+            "bcrypt-pbkdf": "1.0.2",
+            "dashdash": "1.14.1",
+            "ecc-jsbn": "0.1.2",
+            "getpass": "0.1.7",
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@@ -8805,8 +8803,8 @@
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-            "looper": "^3.0.0",
-            "pull-stream": "^3.2.3"
+            "looper": "3.0.0",
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@@ -8830,9 +8828,9 @@
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-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
+            "code-point-at": "1.1.0",
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@@ -8841,9 +8839,9 @@
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-            "es-abstract": "^1.5.0",
-            "function-bind": "^1.0.2"
+            "define-properties": "1.1.3",
+            "es-abstract": "1.13.0",
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@@ -8858,7 +8856,7 @@
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           "dev": true,
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-            "ansi-regex": "^2.0.0"
+            "ansi-regex": "2.1.1"
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@@ -8867,7 +8865,7 @@
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           "dev": true,
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-            "is-utf8": "^0.2.0"
+            "is-utf8": "0.2.1"
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@@ -8877,7 +8875,7 @@
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+            "is-natural-number": "4.0.1"
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@@ -8902,19 +8900,19 @@
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-            "setimmediate": "^1.0.5",
-            "tar.gz": "^1.0.5",
-            "xhr-request-promise": "^0.1.2"
+            "bluebird": "3.5.3",
+            "buffer": "5.2.1",
+            "decompress": "4.2.0",
+            "eth-lib": "0.1.27",
+            "fs-extra": "2.1.2",
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+            "got": "7.1.0",
+            "mime-types": "2.1.22",
+            "mkdirp-promise": "5.0.1",
+            "mock-fs": "4.8.0",
+            "setimmediate": "1.0.5",
+            "tar.gz": "1.0.7",
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@@ -8923,19 +8921,19 @@
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-            "defined": "~1.0.0",
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-            "resolve": "~1.10.0",
-            "resumer": "~0.0.0",
-            "string.prototype.trim": "~1.1.2",
-            "through": "~2.3.8"
+            "deep-equal": "1.0.1",
+            "defined": "1.0.0",
+            "for-each": "0.3.3",
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+            "glob": "7.1.3",
+            "has": "1.0.3",
+            "inherits": "2.0.3",
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+            "object-inspect": "1.6.0",
+            "resolve": "1.10.0",
+            "resumer": "0.0.0",
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+            "through": "2.3.8"
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@@ -8953,9 +8951,9 @@
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-            "fstream": "^1.0.2",
-            "inherits": "2"
+            "block-stream": "0.0.9",
+            "fstream": "1.0.11",
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         "supports-color": {
@@ -15619,7 +15614,7 @@
           "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
           "dev": true,
           "requires": {
-            "has-flag": "^3.0.0"
+            "has-flag": "3.0.0"
           }
         },
         "which-module": {
@@ -15634,18 +15629,18 @@
           "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
           "dev": true,
           "requires": {
-            "cliui": "^4.0.0",
-            "decamelize": "^1.1.1",
-            "find-up": "^2.1.0",
-            "get-caller-file": "^1.0.1",
-            "os-locale": "^2.0.0",
-            "require-directory": "^2.1.1",
-            "require-main-filename": "^1.0.1",
-            "set-blocking": "^2.0.0",
-            "string-width": "^2.0.0",
-            "which-module": "^2.0.0",
-            "y18n": "^3.2.1",
-            "yargs-parser": "^9.0.2"
+            "cliui": "4.1.0",
+            "decamelize": "1.2.0",
+            "find-up": "2.1.0",
+            "get-caller-file": "1.0.2",
+            "os-locale": "2.1.0",
+            "require-directory": "2.1.1",
+            "require-main-filename": "1.0.1",
+            "set-blocking": "2.0.0",
+            "string-width": "2.1.1",
+            "which-module": "2.0.0",
+            "y18n": "3.2.1",
+            "yargs-parser": "9.0.2"
           }
         },
         "yargs-parser": {
@@ -15654,19 +15649,18 @@
           "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=",
           "dev": true,
           "requires": {
-            "camelcase": "^4.1.0"
+            "camelcase": "4.1.0"
           }
         }
       }
     },
     "websocket": {
       "version": "git://github.com/frozeman/WebSocket-Node.git#6c72925e3f8aaaea8dc8450f97627e85263999f2",
-      "from": "git://github.com/frozeman/WebSocket-Node.git#browserifyCompatible",
       "requires": {
-        "debug": "^2.2.0",
-        "nan": "^2.3.3",
-        "typedarray-to-buffer": "^3.1.2",
-        "yaeti": "^0.0.6"
+        "debug": "2.6.9",
+        "nan": "2.9.2",
+        "typedarray-to-buffer": "3.1.5",
+        "yaeti": "0.0.6"
       }
     },
     "which": {
@@ -15675,7 +15669,7 @@
       "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
       "dev": true,
       "requires": {
-        "isexe": "^2.0.0"
+        "isexe": "2.0.0"
       }
     },
     "which-module": {
@@ -15702,8 +15696,8 @@
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1"
+        "string-width": "1.0.2",
+        "strip-ansi": "3.0.1"
       }
     },
     "wrappy": {
@@ -15717,9 +15711,9 @@
       "integrity": "sha1-+Aek8LHZ6ROuekgRLmzDrxmRtF8=",
       "dev": true,
       "requires": {
-        "graceful-fs": "^4.1.11",
-        "imurmurhash": "^0.1.4",
-        "slide": "^1.1.5"
+        "graceful-fs": "4.1.11",
+        "imurmurhash": "0.1.4",
+        "slide": "1.1.6"
       }
     },
     "ws": {
@@ -15727,9 +15721,9 @@
       "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
       "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
       "requires": {
-        "async-limiter": "~1.0.0",
-        "safe-buffer": "~5.1.0",
-        "ultron": "~1.1.0"
+        "async-limiter": "1.0.0",
+        "safe-buffer": "5.1.1",
+        "ultron": "1.1.1"
       }
     },
     "xhr": {
@@ -15737,10 +15731,10 @@
       "resolved": "https://registry.npmjs.org/xhr/-/xhr-2.5.0.tgz",
       "integrity": "sha512-4nlO/14t3BNUZRXIXfXe+3N6w3s1KoxcJUUURctd64BLRe67E4gRwp4PjywtDY72fXpZ1y6Ch0VZQRY/gMPzzQ==",
       "requires": {
-        "global": "~4.3.0",
-        "is-function": "^1.0.1",
-        "parse-headers": "^2.0.0",
-        "xtend": "^4.0.0"
+        "global": "4.3.2",
+        "is-function": "1.0.1",
+        "parse-headers": "2.0.1",
+        "xtend": "4.0.1"
       }
     },
     "xhr-request": {
@@ -15748,13 +15742,13 @@
       "resolved": "https://registry.npmjs.org/xhr-request/-/xhr-request-1.1.0.tgz",
       "integrity": "sha512-Y7qzEaR3FDtL3fP30k9wO/e+FBnBByZeybKOhASsGP30NIkRAAkKD/sCnLvgEfAIEC1rcmK7YG8f4oEnIrrWzA==",
       "requires": {
-        "buffer-to-arraybuffer": "^0.0.5",
-        "object-assign": "^4.1.1",
-        "query-string": "^5.0.1",
-        "simple-get": "^2.7.0",
-        "timed-out": "^4.0.1",
-        "url-set-query": "^1.0.0",
-        "xhr": "^2.0.4"
+        "buffer-to-arraybuffer": "0.0.5",
+        "object-assign": "4.1.1",
+        "query-string": "5.1.1",
+        "simple-get": "2.8.1",
+        "timed-out": "4.0.1",
+        "url-set-query": "1.0.0",
+        "xhr": "2.5.0"
       }
     },
     "xhr-request-promise": {
@@ -15762,7 +15756,7 @@
       "resolved": "https://registry.npmjs.org/xhr-request-promise/-/xhr-request-promise-0.1.2.tgz",
       "integrity": "sha1-NDxE0e53JrhkgGloLQ+EDIO0Jh0=",
       "requires": {
-        "xhr-request": "^1.0.1"
+        "xhr-request": "1.1.0"
       }
     },
     "xhr2": {
@@ -15776,7 +15770,7 @@
       "resolved": "https://registry.npmjs.org/xhr2-cookies/-/xhr2-cookies-1.1.0.tgz",
       "integrity": "sha1-fXdEnQmZGX8VXLc7I99yUF7YnUg=",
       "requires": {
-        "cookiejar": "^2.1.1"
+        "cookiejar": "2.1.2"
       }
     },
     "xmlhttprequest": {
@@ -15812,20 +15806,20 @@
       "integrity": "sha1-wMQpJMpKqmsObaFznfshZDn53cA=",
       "dev": true,
       "requires": {
-        "cliui": "^3.2.0",
-        "decamelize": "^1.1.1",
-        "get-caller-file": "^1.0.1",
-        "lodash.assign": "^4.0.3",
-        "os-locale": "^1.4.0",
-        "read-pkg-up": "^1.0.1",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
-        "set-blocking": "^2.0.0",
-        "string-width": "^1.0.1",
-        "which-module": "^1.0.0",
-        "window-size": "^0.2.0",
-        "y18n": "^3.2.1",
-        "yargs-parser": "^2.4.1"
+        "cliui": "3.2.0",
+        "decamelize": "1.2.0",
+        "get-caller-file": "1.0.2",
+        "lodash.assign": "4.2.0",
+        "os-locale": "1.4.0",
+        "read-pkg-up": "1.0.1",
+        "require-directory": "2.1.1",
+        "require-main-filename": "1.0.1",
+        "set-blocking": "2.0.0",
+        "string-width": "1.0.2",
+        "which-module": "1.0.0",
+        "window-size": "0.2.0",
+        "y18n": "3.2.1",
+        "yargs-parser": "2.4.1"
       }
     },
     "yargs-parser": {
@@ -15834,8 +15828,8 @@
       "integrity": "sha1-hVaN488VD/SfpRgl8DqMiA3cxcQ=",
       "dev": true,
       "requires": {
-        "camelcase": "^3.0.0",
-        "lodash.assign": "^4.0.6"
+        "camelcase": "3.0.0",
+        "lodash.assign": "4.2.0"
       }
     },
     "yauzl": {
@@ -15843,8 +15837,8 @@
       "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
       "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
       "requires": {
-        "buffer-crc32": "~0.2.3",
-        "fd-slicer": "~1.1.0"
+        "buffer-crc32": "0.2.13",
+        "fd-slicer": "1.1.0"
       }
     },
     "yeoman-environment": {
@@ -15853,21 +15847,21 @@
       "integrity": "sha512-IBLwCUrJrDxBYuwdYm1wuF3O/CR2LpXR0rFS684QOrU6x69DPPrsdd20dZOFaedZ/M9sON7po73WhO3I1CbgNQ==",
       "dev": true,
       "requires": {
-        "chalk": "^2.1.0",
-        "cross-spawn": "^6.0.5",
-        "debug": "^3.1.0",
-        "diff": "^3.3.1",
-        "escape-string-regexp": "^1.0.2",
-        "globby": "^8.0.1",
-        "grouped-queue": "^0.3.3",
-        "inquirer": "^5.2.0",
-        "is-scoped": "^1.0.0",
-        "lodash": "^4.17.10",
-        "log-symbols": "^2.1.0",
-        "mem-fs": "^1.1.0",
-        "strip-ansi": "^4.0.0",
-        "text-table": "^0.2.0",
-        "untildify": "^3.0.2"
+        "chalk": "2.4.1",
+        "cross-spawn": "6.0.5",
+        "debug": "3.1.0",
+        "diff": "3.5.0",
+        "escape-string-regexp": "1.0.5",
+        "globby": "8.0.1",
+        "grouped-queue": "0.3.3",
+        "inquirer": "5.2.0",
+        "is-scoped": "1.0.0",
+        "lodash": "4.17.10",
+        "log-symbols": "2.2.0",
+        "mem-fs": "1.1.3",
+        "strip-ansi": "4.0.0",
+        "text-table": "0.2.0",
+        "untildify": "3.0.2"
       },
       "dependencies": {
         "ansi-regex": {
@@ -15903,7 +15897,7 @@
           "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
           "dev": true,
           "requires": {
-            "ansi-regex": "^3.0.0"
+            "ansi-regex": "3.0.0"
           }
         }
       }
@@ -15914,31 +15908,31 @@
       "integrity": "sha512-rV6tJ8oYzm4mmdF2T3wjY+Q42jKF2YiiD0VKfJ8/0ZYwmhCKC9Xs2346HVLPj/xE13i68psnFJv7iS6gWRkeAg==",
       "dev": true,
       "requires": {
-        "async": "^2.6.0",
-        "chalk": "^2.3.0",
-        "cli-table": "^0.3.1",
-        "cross-spawn": "^6.0.5",
-        "dargs": "^5.1.0",
-        "dateformat": "^3.0.3",
-        "debug": "^3.1.0",
-        "detect-conflict": "^1.0.0",
-        "error": "^7.0.2",
-        "find-up": "^2.1.0",
-        "github-username": "^4.0.0",
-        "istextorbinary": "^2.2.1",
-        "lodash": "^4.17.10",
-        "make-dir": "^1.1.0",
-        "mem-fs-editor": "^4.0.0",
-        "minimist": "^1.2.0",
-        "pretty-bytes": "^4.0.2",
-        "read-chunk": "^2.1.0",
-        "read-pkg-up": "^3.0.0",
-        "rimraf": "^2.6.2",
-        "run-async": "^2.0.0",
-        "shelljs": "^0.8.0",
-        "text-table": "^0.2.0",
-        "through2": "^2.0.0",
-        "yeoman-environment": "^2.0.5"
+        "async": "2.6.0",
+        "chalk": "2.4.1",
+        "cli-table": "0.3.1",
+        "cross-spawn": "6.0.5",
+        "dargs": "5.1.0",
+        "dateformat": "3.0.3",
+        "debug": "3.1.0",
+        "detect-conflict": "1.0.1",
+        "error": "7.0.2",
+        "find-up": "2.1.0",
+        "github-username": "4.1.0",
+        "istextorbinary": "2.2.1",
+        "lodash": "4.17.10",
+        "make-dir": "1.3.0",
+        "mem-fs-editor": "4.0.2",
+        "minimist": "1.2.0",
+        "pretty-bytes": "4.0.2",
+        "read-chunk": "2.1.0",
+        "read-pkg-up": "3.0.0",
+        "rimraf": "2.6.2",
+        "run-async": "2.3.0",
+        "shelljs": "0.8.2",
+        "text-table": "0.2.0",
+        "through2": "2.0.3",
+        "yeoman-environment": "2.1.1"
       },
       "dependencies": {
         "async": {
@@ -15947,7 +15941,7 @@
           "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
           "dev": true,
           "requires": {
-            "lodash": "^4.14.0"
+            "lodash": "4.17.10"
           }
         },
         "debug": {
@@ -15965,7 +15959,7 @@
           "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
           "dev": true,
           "requires": {
-            "locate-path": "^2.0.0"
+            "locate-path": "2.0.0"
           }
         },
         "load-json-file": {
@@ -15974,10 +15968,10 @@
           "integrity": "sha1-L19Fq5HjMhYjT9U62rZo607AmTs=",
           "dev": true,
           "requires": {
-            "graceful-fs": "^4.1.2",
-            "parse-json": "^4.0.0",
-            "pify": "^3.0.0",
-            "strip-bom": "^3.0.0"
+            "graceful-fs": "4.1.11",
+            "parse-json": "4.0.0",
+            "pify": "3.0.0",
+            "strip-bom": "3.0.0"
           }
         },
         "lodash": {
@@ -15998,8 +15992,8 @@
           "integrity": "sha1-vjX1Qlvh9/bHRxhPmKeIy5lHfuA=",
           "dev": true,
           "requires": {
-            "error-ex": "^1.3.1",
-            "json-parse-better-errors": "^1.0.1"
+            "error-ex": "1.3.1",
+            "json-parse-better-errors": "1.0.2"
           }
         },
         "path-type": {
@@ -16008,7 +16002,7 @@
           "integrity": "sha512-T2ZUsdZFHgA3u4e5PfPbjd7HDDpxPnQb5jN0SrDsjNSuVXHJqtwTnWqG0B1jZrgmJ/7lj1EmVIByWt1gxGkWvg==",
           "dev": true,
           "requires": {
-            "pify": "^3.0.0"
+            "pify": "3.0.0"
           }
         },
         "pify": {
@@ -16023,9 +16017,9 @@
           "integrity": "sha1-nLxoaXj+5l0WwA4rGcI3/Pbjg4k=",
           "dev": true,
           "requires": {
-            "load-json-file": "^4.0.0",
-            "normalize-package-data": "^2.3.2",
-            "path-type": "^3.0.0"
+            "load-json-file": "4.0.0",
+            "normalize-package-data": "2.4.0",
+            "path-type": "3.0.0"
           }
         },
         "read-pkg-up": {
@@ -16034,8 +16028,8 @@
           "integrity": "sha1-PtSWaF26D4/hGNBpHcUfSh/5bwc=",
           "dev": true,
           "requires": {
-            "find-up": "^2.0.0",
-            "read-pkg": "^3.0.0"
+            "find-up": "2.1.0",
+            "read-pkg": "3.0.0"
           }
         },
         "shelljs": {
@@ -16044,9 +16038,9 @@
           "integrity": "sha512-pRXeNrCA2Wd9itwhvLp5LZQvPJ0wU6bcjaTMywHHGX5XWhVN2nzSu7WV0q+oUY7mGK3mgSkDDzP3MgjqdyIgbQ==",
           "dev": true,
           "requires": {
-            "glob": "^7.0.0",
-            "interpret": "^1.0.0",
-            "rechoir": "^0.6.2"
+            "glob": "7.1.3",
+            "interpret": "1.1.0",
+            "rechoir": "0.6.2"
           }
         },
         "strip-bom": {
@@ -16064,4 +16058,4 @@
       "dev": true
     }
   }
-}
+}
\ No newline at end of file
diff --git a/packages/lib/src/artifacts/Contract.ts b/packages/lib/src/artifacts/Contract.ts
index 44e8c9c04..53460ac6e 100644
--- a/packages/lib/src/artifacts/Contract.ts
+++ b/packages/lib/src/artifacts/Contract.ts
@@ -2,7 +2,6 @@ import ZWeb3 from './ZWeb3';
 import Contracts from './Contracts';
 import ContractAST from '../utils/ContractAST';
 import { StorageLayoutInfo } from '../validations/Storage';
-import { Callback, EventLog, EventEmitter, TransactionReceipt } from 'web3/types';
 import { Contract as Web3Contract, TransactionObject, BlockType } from 'web3-eth-contract';
 
 /*
@@ -15,23 +14,14 @@ import { Contract as Web3Contract, TransactionObject, BlockType } from 'web3-eth
  */
 export default interface Contract {
 
-  // Web3 Contract interface.
-  options: any;
-  methods: { [fnName: string]: (...args: any[]) => TransactionObject<any>; };
-  deploy(options: { data: string; arguments: any[]; }): TransactionObject<Web3Contract>;
-  events: {
-    [eventName: string]: (options?: { filter?: object; fromBlock?: BlockType; topics?: string[]; }, cb?: Callback<EventLog>) => EventEmitter;
-    allEvents: (options?: { filter?: object; fromBlock?: BlockType; topics?: string[]; }, cb?: Callback<EventLog>) => EventEmitter;
-  };
-  getPastEvents(event: string, options?: { filter?: object; fromBlock?: BlockType; toBlock?: BlockType; topics?: string[]; }, cb?: Callback<EventLog[]>): Promise<EventLog[]>;
-  setProvider(provider: any): void;
+  deploy(options: { data: string; arguments: any[]; }): any;
+  methods: { [fnName: string]: (...args: any[]) => any; };
 
   // Contract specific.
   address: string;
   new: (args?: any[], options?: {}) => Promise<Contract>;
   at: (address: string) => Contract;
   link: (libraries: { [libAlias: string]: string }) => void;
-  deployment?: { transactionHash: string, transactionReceipt: TransactionReceipt };
   schema: {
 
     // Zos schema specific.
@@ -65,60 +55,9 @@ interface ContractMethod {
   inputs: string[];
 }
 
-function _wrapContractInstance(schema: any, instance: Web3Contract): Contract {
-  instance.schema = schema;
-
-  instance.new = async function(...passedArguments): Promise<Contract> {
-    const [args, options] = parseArguments(passedArguments, schema.abi);
-    if(!schema.linkedBytecode) throw new Error(`${schema.contractName} bytecode contains unlinked libraries.`);
-    instance.options = { ...instance.options, ...(await Contracts.getDefaultTxParams()) };
-    return new Promise((resolve, reject) => {
-      const tx = instance.deploy({ data: schema.linkedBytecode, arguments: args });
-      let transactionReceipt, transactionHash;
-      tx.send({ ...options })
-        .on('error', (error) => reject(error))
-        .on('receipt', (receipt) => transactionReceipt = receipt)
-        .on('transactionHash', (hash) => transactionHash = hash)
-        .then((deployedInstance) => { // instance != deployedInstance
-          deployedInstance = _wrapContractInstance(schema, deployedInstance);
-          deployedInstance.deployment = { transactionReceipt, transactionHash };
-          resolve(deployedInstance);
-        })
-        .catch((error) => reject(error));
-    });
-  };
-
-  instance.at = function(address: string): Contract | never {
-    if(!ZWeb3.isAddress(address)) throw new Error('Given address is not valid: ' + address);
-    const newWeb3Instance = instance.clone();
-    newWeb3Instance._address = address;
-    newWeb3Instance.options.address = address;
-    return _wrapContractInstance(instance.schema, newWeb3Instance);
-  };
-
-  instance.link = function(libraries: { [libAlias: string]: string }): void {
-    instance.schema.linkedBytecode = instance.schema.bytecode;
-    instance.schema.linkedDeployedBytecode = instance.schema.deployedBytecode;
-
-    Object.keys(libraries).forEach((name: string) => {
-      const address = libraries[name].replace(/^0x/, '');
-      const regex = new RegExp(`__${name}_+`, 'g');
-      instance.schema.linkedBytecode = instance.schema.linkedBytecode.replace(regex, address);
-      instance.schema.linkedDeployedBytecode = instance.schema.linkedDeployedBytecode.replace(regex, address);
-    });
-  };
-
-  // TODO: Remove after web3 adds the getter: https://github.com/ethereum/web3.js/issues/2274
-  if(typeof instance.address === 'undefined') {
-    Object.defineProperty(instance, 'address', { get: () => instance.options.address });
-  }
-
-  return instance;
-}
-
 export function createContract(schema: any): Contract {
   const contract = ZWeb3.contract(schema.abi, null, Contracts.getArtifactsDefaults());
-  return _wrapContractInstance(schema, contract);
+  return ZWeb3.wrapContractInstance(schema, contract);
 }
 
 // get methods from AST, as there is no info about the modifiers in the ABI
@@ -133,18 +72,4 @@ export function contractMethodsFromAst(instance: Contract): ContractMethod[] {
 
       return { ...method, hasInitializer: initializer ? true : false };
     });
-}
-
-function parseArguments(passedArguments, abi) {
-  const constructorAbi = abi.find((elem) => elem.type === 'constructor') || {};
-  const constructorArgs = constructorAbi.inputs && constructorAbi.inputs.length > 0 ? constructorAbi.inputs : [];
-  let givenOptions = {};
-
-  if (passedArguments.length === constructorArgs.length + 1) {
-      const lastArg = passedArguments[passedArguments.length - 1];
-      if (typeof(lastArg) === 'object') {
-        givenOptions = passedArguments.pop();
-      }
-  }
-  return [passedArguments, givenOptions];
-}
+}
\ No newline at end of file
diff --git a/packages/lib/src/artifacts/Networks.ts b/packages/lib/src/artifacts/Networks.ts
new file mode 100644
index 000000000..ad5c0e1cb
--- /dev/null
+++ b/packages/lib/src/artifacts/Networks.ts
@@ -0,0 +1,11 @@
+// Reference: see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-155.md#list-of-chain-ids
+const NETWORKS = {
+	1: 'mainnet',
+	2: 'morden',
+	3: 'ropsten',
+	4: 'rinkeby',
+	5: 'goerli',
+	42: 'kovan'
+};
+
+export default NETWORKS
\ No newline at end of file
diff --git a/packages/lib/src/artifacts/ZWeb3.ts b/packages/lib/src/artifacts/ZWeb3.ts
index 103baef82..dff914b44 100644
--- a/packages/lib/src/artifacts/ZWeb3.ts
+++ b/packages/lib/src/artifacts/ZWeb3.ts
@@ -1,183 +1,143 @@
-import Logger from '../utils/Logger';
-import sleep from '../helpers/sleep';
-import Web3 from 'web3';
-import { TransactionReceipt } from 'web3/types';
-import { Eth, Block, Transaction } from 'web3-eth';
-import { Contract } from 'web3-eth-contract';
-import { toChecksumAddress } from 'web3-utils';
-
-const log: Logger = new Logger('ZWeb3');
-
-// Reference: see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-155.md#list-of-chain-ids
-const NETWORKS = {
-  1:  'mainnet',
-  2:  'morden',
-  3:  'ropsten',
-  4:  'rinkeby',
-  5:  'goerli',
-  42: 'kovan'
-};
+import IMPLEMENTATIONS from './web3-implementations/Implementations';
+import { Web3JSImplementation } from './web3-implementations/Web3JSImplementation';
+import ZWeb3Interface from './ZWeb3Interface';
+import { EthersImplementation } from './web3-implementations/EthersImplementation';
+import Contract from './Contract';
 
 // TS-TODO: Type Web3.
 // TS-TODO: Review what could be private in this class.
 export default class ZWeb3 {
 
   public static provider;
+  public static implementation: ZWeb3Interface;
+
+  public static initialize(provider: any, implementation: IMPLEMENTATIONS = IMPLEMENTATIONS.WEB3JS): void {
+
+    switch (implementation) {
+      case IMPLEMENTATIONS.WEB3JS:
+        ZWeb3.implementation = new Web3JSImplementation(provider)
+        break;
+      case IMPLEMENTATIONS.ETHERS:
+        ZWeb3.implementation = new EthersImplementation(provider)
+        break;
+      default:
+        throw new Error('No usable implementation supplied');
+    }
+
+    ZWeb3.provider = ZWeb3.implementation.provider;
 
-  public static initialize(provider: any): void {
-    ZWeb3.provider = provider;
   }
 
   // TODO: this.web3 could be cached and initialized lazily?
   public static web3(): any {
-    if (!ZWeb3.provider) return new Web3();
-
-    // TODO: improve provider validation for HttpProvider scenarios
-    return typeof ZWeb3.provider === 'string'
-      ? new Web3(new Web3.providers.HttpProvider(ZWeb3.provider))
-      : new Web3(ZWeb3.provider);
+    return ZWeb3.implementation.web3
   }
 
   public static sha3(value: string): string {
-    return Web3.utils.sha3(value);
+    return ZWeb3.implementation.sha3(value);
   }
 
   public static isAddress(address: string): boolean {
-    return Web3.utils.isAddress(address);
+    return ZWeb3.implementation.isAddress(address);
   }
 
-  public static eth(): Eth {
-    return ZWeb3.web3().eth;
+  public static eth(): any { // GEORGETODO Probably remove this completely or leave it only when web3js version
+    return ZWeb3.implementation.eth;
   }
 
   public static version(): string {
-    return ZWeb3.web3().version;
+    return ZWeb3.implementation.version;
   }
 
-  public static contract(abi: any, atAddress?: string, options?: any): Contract {
-    return new (ZWeb3.eth().Contract)(abi, atAddress, options);
+  public static contract(abi: any, atAddress?: string, options?: any) {
+    return ZWeb3.implementation.contract(abi, atAddress, options);
+  }
+
+  public static wrapContractInstance(schema: any, instance: any): Contract {
+    return ZWeb3.implementation.wrapContractInstance(schema, instance);
   }
 
   public static async accounts(): Promise<string[]> {
-    return await ZWeb3.eth().getAccounts();
+    return await ZWeb3.implementation.accounts();
   }
 
   public static async defaultAccount(): Promise<string> {
-    return (await ZWeb3.accounts())[0];
+    return await ZWeb3.implementation.defaultAccount();
   }
 
   public static toChecksumAddress(address: string): string | null {
-    if (!address) return null;
-
-    if (address.match(/[A-F]/)) {
-      if (toChecksumAddress(address) !== address) {
-        throw Error(`Given address \"${address}\" is not a valid Ethereum address or it has not been checksummed correctly.`);
-      } else return address;
-    } else {
-      log.warn(`WARNING: Address ${address} is not checksummed. Consider checksumming it to avoid future warnings or errors.`);
-      return toChecksumAddress(address);
-    }
+    return ZWeb3.implementation.toChecksumAddress(address);
   }
 
   public static async estimateGas(params: any): Promise<number> {
-    return ZWeb3.eth().estimateGas({ ...params });
+    return ZWeb3.implementation.estimateGas(params);
   }
 
   public static async getBalance(address: string): Promise<string> {
-    return ZWeb3.eth().getBalance(address);
+    return ZWeb3.implementation.getBalance(address);
   }
 
   public static async getCode(address: string): Promise<string> {
-    return ZWeb3.eth().getCode(address);
+    return ZWeb3.implementation.getCode(address);
   }
 
   public static async hasBytecode(address): Promise<boolean> {
-    const bytecode = await ZWeb3.getCode(address);
-    return bytecode.length > 2;
+    return ZWeb3.implementation.hasBytecode(address)
   }
 
   public static async getStorageAt(address: string, position: string): Promise<string> {
-    return ZWeb3.eth().getStorageAt(address, position);
+    return ZWeb3.implementation.getStorageAt(address, position);
   }
 
   public static async getNode(): Promise<string> {
-    return ZWeb3.eth().getNodeInfo();
+    return ZWeb3.implementation.getNode()
   }
 
   public static async isGanacheNode(): Promise<boolean> {
-    const nodeVersion = await ZWeb3.getNode();
-    return nodeVersion.match(/TestRPC/) !== null;
+    return ZWeb3.implementation.isGanacheNode()
   }
 
-  public static async getBlock(filter: string | number): Promise<Block> {
-    return ZWeb3.eth().getBlock(filter);
+  public static async getBlock(filter: string | number): Promise<any> {
+    return ZWeb3.implementation.getBlock(filter);
   }
 
-  public static async getLatestBlock(): Promise<Block> {
-    return ZWeb3.getBlock('latest');
+  public static async getLatestBlock(): Promise<any> {
+    return ZWeb3.implementation.getLatestBlock();
   }
 
   public static async getLatestBlockNumber(): Promise<number> {
-    return (await ZWeb3.getLatestBlock()).number;
+    return ZWeb3.implementation.getLatestBlockNumber();
   }
 
   public static async isMainnet(): Promise<boolean> {
-    return (await ZWeb3.getNetworkName()) === 'mainnet';
+    return ZWeb3.implementation.isMainnet();
   }
 
   public static async getNetwork(): Promise<number> {
-    return ZWeb3.eth().net.getId();
+    return ZWeb3.implementation.getNetwork();
   }
 
   public static async getNetworkName(): Promise<string> {
-    const networkId = await ZWeb3.getNetwork();
-    return NETWORKS[networkId] || `dev-${networkId}`;
+    return ZWeb3.implementation.getNetworkName()
   }
 
-  public static async sendTransaction(params: any): Promise<TransactionReceipt> {
-    return ZWeb3.eth().sendTransaction({ ...params });
+  public static async sendTransaction(params: any): Promise<any> {
+    return ZWeb3.implementation.sendTransaction(params);
   }
 
   public static sendTransactionWithoutReceipt(params: any): Promise<string> {
-    return new Promise((resolve, reject) => {
-      ZWeb3.eth().sendTransaction({ ...params }, (error, txHash) => {
-        if(error) reject(error.message);
-        else resolve(txHash);
-      });
-    });
+    return ZWeb3.implementation.sendTransactionWithoutReceipt(params);
   }
 
-  public static async getTransaction(txHash: string): Promise<Transaction> {
-    return ZWeb3.eth().getTransaction(txHash);
+  public static async getTransaction(txHash: string): Promise<any> {
+    return ZWeb3.implementation.getTransaction(txHash);
   }
 
-  public static async getTransactionReceipt(txHash: string): Promise<TransactionReceipt> {
-    return ZWeb3.eth().getTransactionReceipt(txHash);
+  public static async getTransactionReceipt(txHash: string): Promise<any> {
+    return ZWeb3.implementation.getTransactionReceipt(txHash);
   }
 
-  public static async getTransactionReceiptWithTimeout(tx: string, timeout: number): Promise<TransactionReceipt> {
-    return ZWeb3._getTransactionReceiptWithTimeout(tx, timeout, new Date().getTime());
-  }
-
-  private static async _getTransactionReceiptWithTimeout(tx: string, timeout: number, startTime: number): Promise<TransactionReceipt | never> {
-    const receipt: any = await ZWeb3._tryGettingTransactionReceipt(tx);
-    if (receipt) {
-      if (receipt.status) return receipt;
-      throw new Error(`Transaction: ${tx} exited with an error (status 0).`);
-    }
-
-    await sleep(1000);
-    const timeoutReached = timeout > 0 && new Date().getTime() - startTime > timeout;
-    if (!timeoutReached) return await ZWeb3._getTransactionReceiptWithTimeout(tx, timeout, startTime);
-    throw new Error(`Transaction ${tx} wasn't processed in ${timeout / 1000} seconds!`);
-  }
-
-  private static async _tryGettingTransactionReceipt(tx: string): Promise<TransactionReceipt | never> {
-    try {
-      return await ZWeb3.getTransactionReceipt(tx);
-    } catch (error) {
-      if (error.message.includes('unknown transaction')) return null;
-      else throw error;
-    }
+  public static async getTransactionReceiptWithTimeout(txHash: string, timeout: number): Promise<any> {
+    return ZWeb3.implementation.getTransactionReceiptWithTimeout(txHash, timeout)
   }
 }
diff --git a/packages/lib/src/artifacts/ZWeb3Interface.ts b/packages/lib/src/artifacts/ZWeb3Interface.ts
new file mode 100644
index 000000000..3a9935974
--- /dev/null
+++ b/packages/lib/src/artifacts/ZWeb3Interface.ts
@@ -0,0 +1,33 @@
+import Contract from "./Contract";
+
+export default interface ZWeb3Interface {
+	provider: any;
+	web3: any;
+	sha3(value: string): string;
+	isAddress(address: string): boolean;
+	eth: any;
+	version: string;
+	contract(abi: any, atAddress?: string, options?: any): any;
+	wrapContractInstance(schema: any, instance: any): Contract;
+	accounts(): Promise<string[]>;
+	defaultAccount(): Promise<string>;
+	toChecksumAddress(address: string): string | null;
+	estimateGas(params: any): Promise<number>;
+	getBalance(address: string): Promise<string>;
+	getCode(address: string): Promise<string>;
+	hasBytecode(address): Promise<boolean>;
+	getStorageAt(address: string, position: string): Promise<string>;
+	getNode(): Promise<string>;
+	isGanacheNode(): Promise<boolean>;
+	getBlock(filter: string | number): Promise<any>;
+	getLatestBlock(): Promise<any>;
+	getLatestBlockNumber(): Promise<number>;
+	isMainnet(): Promise<boolean>;
+	getNetwork(): Promise<number>;
+	getNetworkName(): Promise<string>;
+	sendTransaction(params: any): Promise<any>;
+	sendTransactionWithoutReceipt(params: any): Promise<string>;
+	getTransaction(txHash: string): Promise<any>;
+	getTransactionReceipt(txHash: string): Promise<any>;
+	getTransactionReceiptWithTimeout(tx: string, timeout: number): Promise<any>;
+}
\ No newline at end of file
diff --git a/packages/lib/src/artifacts/web3-implementations/EthersImplementation.ts b/packages/lib/src/artifacts/web3-implementations/EthersImplementation.ts
new file mode 100644
index 000000000..cc8bf34c5
--- /dev/null
+++ b/packages/lib/src/artifacts/web3-implementations/EthersImplementation.ts
@@ -0,0 +1,354 @@
+import NETWORKS from '../Networks';
+import Logger from '../../utils/Logger';
+import sleep from '../../helpers/sleep';
+import ZWeb3Interface from '../ZWeb3Interface';
+import { Provider, AsyncSendable, JsonRpcProvider, Web3Provider, Block, TransactionRequest, TransactionReceipt, TransactionResponse } from 'ethers/providers';
+import { Contract as EthersContract } from 'ethers/contract';
+import { Interface } from 'ethers/utils/interface';
+import { Wallet } from 'ethers/wallet'
+import { version } from 'ethers/_version';
+import * as utils from 'ethers/utils'
+import Contract from '../Contract';
+import { StorageLayoutInfo } from '../../validations/Storage';
+import { Signer } from 'ethers/abstract-signer';
+
+const log: Logger = new Logger('ZWeb3EthersImplementation');
+
+export interface IZEthersContract {
+
+	instanceSigner: Signer;
+
+	deploy(options: { data: string; arguments: any[]; }): any;
+	methods: { [fnName: string]: (...args: any[]) => any; };
+
+	// Contract specific.
+	address: string;
+	new: (args?: any[], options?: {}) => Promise<IZEthersContract>;
+	at: (address: string) => Contract;
+	link: (libraries: { [libAlias: string]: string }) => void;
+	schema: {
+
+		// Zos schema specific.
+		directory: string;
+		linkedBytecode: string;
+		linkedDeployedBytecode: string;
+		warnings: any;
+		storageInfo: StorageLayoutInfo;
+
+		// Solidity schema.
+		schemaVersion: string;
+		contractName: string;
+		abi: any[];
+		bytecode: string;
+		deployedBytecode: string;
+		sourceMap: string;
+		deployedSourceMap: string;
+		source: string;
+		sourcePath: string;
+		ast: any;
+		legacyAST: any;
+		compiler: any;
+		networks: any;
+		updatedAt: string;
+	};
+}
+
+export class ZEthersContract implements IZEthersContract {
+	instanceSigner: Signer;
+	provider;
+	address: string;
+	methods;
+	schema: {
+
+		// Zos schema specific.
+		directory: string;
+		linkedBytecode: string;
+		linkedDeployedBytecode: string;
+		warnings: any;
+		storageInfo: StorageLayoutInfo;
+
+		// Solidity schema.
+		schemaVersion: string;
+		contractName: string;
+		abi: any[];
+		bytecode: string;
+		deployedBytecode: string;
+		sourceMap: string;
+		deployedSourceMap: string;
+		source: string;
+		sourcePath: string;
+		ast: any;
+		legacyAST: any;
+		compiler: any;
+		networks: any;
+		updatedAt: string;
+	};
+	interface: Interface;
+	constructor(instance: Interface | EthersContract, schema: any, provider: any, instanceSigner: Signer) {
+		this.schema = schema;
+		this.provider = provider;
+		this.instanceSigner = instanceSigner;
+		if (Interface.isInterface(instance)) {
+			this.interface = instance;
+		}
+
+		this.methods = this.convertFunctionsToMethods()
+	}
+
+	private convertFunctionsToMethods() {
+		const methods = {}
+		for (const fnDesc in Object.keys(this.interface.functions)) {
+			methods[fnDesc] = this.convertFunctionToMethod(fnDesc, this.interface.functions)
+		}
+
+		return this.interface.functions;
+	}
+
+	private convertFunctionToMethod(fnDesc: string, functions: object): object {
+		const call = async (params) => {
+			// TODO
+		}
+
+		const send = async (params) => {
+			// TODO
+		}
+
+		const encodeABI = async (params) => {
+			// TODO
+		}
+
+		return {
+			call,
+			send,
+			encodeABI
+		}
+	}
+
+	new(args?: any[], options?: {}): Promise<ZEthersContract> {
+		// TODO
+		return undefined
+	}
+
+	at(address: string): ZEthersContract {
+		// TODO
+		return undefined
+	}
+
+	link(libraries: { [libAlias: string]: string }) {
+		// TODO
+	};
+
+	deploy(options: { data: string; arguments: any[]; }): any {
+		// TODO
+		const self = this;
+		return {
+			encodeABI: () => {
+				return self.interface.deployFunction.encode(options.data, options.arguments);
+			}
+		}
+	}
+}
+
+
+// TS-TODO: Type Web3.
+// TS-TODO: Review what could be private in this class.
+export class EthersImplementation implements ZWeb3Interface {
+
+	private _provider;
+	private wallet: Wallet;
+
+	constructor(providerWalletOrURL: string | Wallet | JsonRpcProvider | AsyncSendable) {
+		if (typeof providerWalletOrURL === 'string') {
+			this._provider = new JsonRpcProvider(providerWalletOrURL);
+			return;
+		}
+
+		if (typeof providerWalletOrURL === 'object') {
+
+			if (Wallet.isSigner(providerWalletOrURL)) {
+				if (typeof (providerWalletOrURL as Wallet).provider == 'undefined') {
+					throw new Error('No usable ethers provider or URL found');
+				}
+				this._provider = (providerWalletOrURL as Wallet).provider
+				this.wallet = providerWalletOrURL;
+				return;
+			}
+
+			if (JsonRpcProvider.isProvider(providerWalletOrURL)) {
+				this._provider = providerWalletOrURL
+				return;
+			}
+
+			if (typeof (providerWalletOrURL as AsyncSendable).send === 'function' || typeof (providerWalletOrURL as AsyncSendable).sendAsync === 'function') {
+				this._provider = new Web3Provider((providerWalletOrURL as AsyncSendable));
+				return;
+			}
+		}
+
+		throw new Error('No usable ethers provider or URL found');
+
+	}
+
+	public get provider(): JsonRpcProvider {
+		return this._provider
+	}
+
+	public get web3(): JsonRpcProvider {
+		return this._provider;
+	}
+
+	public sha3(value: string): string {
+		return utils.keccak256(utils.toUtf8Bytes(value));
+	}
+
+	public isAddress(address: string): boolean {
+		try {
+			utils.getAddress(address); // ethers throws if the supplied argument is not an address
+		} catch (e) {
+			return false
+		}
+		return true
+	}
+
+	public get eth(): Provider {
+		return this.provider;
+	}
+
+	public get version(): string {
+		return version;
+	}
+
+	public contract(abi: any, atAddress?: string, options?: any): Interface | EthersContract {
+		// TODO
+		return new Interface(abi)
+	}
+
+	public wrapContractInstance(schema: any, instance: Interface | EthersContract): ZEthersContract {
+		// TODO
+		return undefined;
+	}
+
+	public async accounts(): Promise<string[]> {
+		return (this.provider as JsonRpcProvider).listAccounts()
+	}
+
+	public async defaultAccount(): Promise<string> {
+		return (await this.accounts())[0];
+	}
+
+	public toChecksumAddress(address: string): string | null {
+		return utils.getAddress(address);
+	}
+
+	public async estimateGas(params: TransactionRequest): Promise<number> {
+		const gasBN = await this.provider.estimateGas(params);
+		return gasBN.toNumber();
+	}
+
+	public async getBalance(address: string): Promise<string> {
+		const balanceBN = await this.provider.getBalance(address);
+		return balanceBN.toString()
+	}
+
+	public async getCode(address: string): Promise<string> {
+		return this.provider.getCode(address);
+	}
+
+	public async hasBytecode(address): Promise<boolean> {
+		const bytecode = await this.getCode(address);
+		return bytecode.length > 2;
+	}
+
+	public async getStorageAt(address: string, position: string): Promise<string> {
+		return this.provider.getStorageAt(address, position);
+	}
+
+	public async getNode(): Promise<string> {
+		return this.provider.send('web3_clientVersion', []);
+	}
+
+	public async isGanacheNode(): Promise<boolean> {
+		const nodeVersion = await this.getNode();
+		return nodeVersion.match(/TestRPC/) !== null;
+	}
+
+	public async getBlock(filter: string | number): Promise<Block> {
+		return this.provider.getBlock(filter);
+	}
+
+	public async getLatestBlock(): Promise<Block> {
+		return this.getBlock('latest');
+	}
+
+	public async getLatestBlockNumber(): Promise<number> {
+		return (await this.getLatestBlock()).number;
+	}
+
+	public async isMainnet(): Promise<boolean> {
+		return (await this.getNetworkName()) === 'mainnet';
+	}
+
+	public async getNetwork(): Promise<number> {
+		const network = await this.provider.getNetwork();
+		return network.chainId;
+	}
+
+	public async getNetworkName(): Promise<string> {
+		const networkId = await this.getNetwork();
+		return NETWORKS[networkId] || `dev-${networkId}`;
+	}
+
+	private async _sendTransaction(params: any): Promise<TransactionResponse> {
+		const paramsCopy = utils.shallowCopy(params);
+		const from = paramsCopy.from | 0;
+		const signer = await this.provider.getSigner(from);
+		delete paramsCopy.from;
+		paramsCopy.value = utils.bigNumberify(paramsCopy.value);
+		const txResponse = await signer.sendTransaction((paramsCopy as TransactionRequest));
+		return txResponse;
+	}
+
+	public async sendTransaction(params: any): Promise<TransactionReceipt> {
+		const txResponse = await this._sendTransaction(params);
+		return txResponse.wait()
+	}
+
+	public async sendTransactionWithoutReceipt(params: any): Promise<string> {
+		const txResponse = await this._sendTransaction(params);
+		return txResponse.hash;
+	}
+
+	public async getTransaction(txHash: string): Promise<TransactionResponse> {
+		return this.provider.getTransaction(txHash);
+	}
+
+	public async getTransactionReceipt(txHash: string): Promise<TransactionReceipt> {
+		return this.provider.getTransactionReceipt(txHash);
+	}
+
+	public async getTransactionReceiptWithTimeout(txHash: string, timeout: number): Promise<TransactionReceipt> {
+		return this._getTransactionReceiptWithTimeout(txHash, timeout, new Date().getTime());
+	}
+
+	private async _getTransactionReceiptWithTimeout(txHash: string, timeout: number, startTime: number): Promise<TransactionReceipt | never> {
+		const receipt: any = await this._tryGettingTransactionReceipt(txHash);
+		if (receipt) {
+			if (receipt.status) return receipt;
+			throw new Error(`Transaction: ${txHash} exited with an error (status 0).`);
+		}
+
+		await sleep(1000);
+		const timeoutReached = timeout > 0 && new Date().getTime() - startTime > timeout;
+		if (!timeoutReached) return await this._getTransactionReceiptWithTimeout(txHash, timeout, startTime);
+		throw new Error(`Transaction ${txHash} wasn't processed in ${timeout / 1000} seconds!`);
+	}
+
+	private async _tryGettingTransactionReceipt(txHash: string): Promise<TransactionReceipt | never> {
+		try {
+			return await this.getTransactionReceipt(txHash);
+		} catch (error) {
+			if (error.message.includes('unknown transaction')) return null;
+			else throw error;
+		}
+	}
+}
diff --git a/packages/lib/src/artifacts/web3-implementations/Implementations.ts b/packages/lib/src/artifacts/web3-implementations/Implementations.ts
new file mode 100644
index 000000000..b731be4a3
--- /dev/null
+++ b/packages/lib/src/artifacts/web3-implementations/Implementations.ts
@@ -0,0 +1,6 @@
+const enum IMPLEMENTATIONS {
+	WEB3JS = 'web3.js',
+	ETHERS = 'ethers'
+};
+
+export default IMPLEMENTATIONS
\ No newline at end of file
diff --git a/packages/lib/src/artifacts/web3-implementations/Web3JSImplementation.ts b/packages/lib/src/artifacts/web3-implementations/Web3JSImplementation.ts
new file mode 100644
index 000000000..9f6279ae5
--- /dev/null
+++ b/packages/lib/src/artifacts/web3-implementations/Web3JSImplementation.ts
@@ -0,0 +1,296 @@
+import NETWORKS from '../Networks';
+import Logger from '../../utils/Logger';
+import sleep from '../../helpers/sleep';
+import Web3 from 'web3';
+import { TransactionReceipt, Callback, EventLog, EventEmitter } from 'web3/types';
+import { Eth, Block, Transaction } from 'web3-eth';
+import { Contract as Web3Contract } from 'web3-eth-contract';
+import Contract from '../Contract';
+import { toChecksumAddress } from 'web3-utils';
+import ZWeb3Interface from '../ZWeb3Interface';
+import { TransactionObject, BlockType } from 'web3/eth/types';
+import { StorageLayoutInfo } from '../../validations/Storage';
+import Contracts from '../Contracts';
+
+const log: Logger = new Logger('ZWeb3JSImplementation');
+
+export interface ZWeb3JSContract {
+
+	// Web3 Contract interface.
+	options: any;
+	methods: { [fnName: string]: (...args: any[]) => TransactionObject<any>; };
+	deploy(options: { data: string; arguments: any[]; }): TransactionObject<Web3Contract>; // GEORGETODO Change the return type
+	events: {
+		[eventName: string]: (options?: { filter?: object; fromBlock?: BlockType; topics?: string[]; }, cb?: Callback<EventLog>) => EventEmitter;
+		allEvents: (options?: { filter?: object; fromBlock?: BlockType; topics?: string[]; }, cb?: Callback<EventLog>) => EventEmitter;
+	};
+	getPastEvents(event: string, options?: { filter?: object; fromBlock?: BlockType; toBlock?: BlockType; topics?: string[]; }, cb?: Callback<EventLog[]>): Promise<EventLog[]>;
+	setProvider(provider: any): void;
+
+	// Contract specific.
+	address: string;
+	new: (args?: any[], options?: {}) => Promise<Contract>;
+	at: (address: string) => Contract;
+	link: (libraries: { [libAlias: string]: string }) => void;
+	deployment?: { transactionHash: string, transactionReceipt: TransactionReceipt };
+	schema: {
+
+		// Zos schema specific.
+		directory: string;
+		linkedBytecode: string;
+		linkedDeployedBytecode: string;
+		warnings: any;
+		storageInfo: StorageLayoutInfo;
+
+		// Solidity schema.
+		schemaVersion: string;
+		contractName: string;
+		abi: any[];
+		bytecode: string;
+		deployedBytecode: string;
+		sourceMap: string;
+		deployedSourceMap: string;
+		source: string;
+		sourcePath: string;
+		ast: any;
+		legacyAST: any;
+		compiler: any;
+		networks: any;
+		updatedAt: string;
+	};
+}
+
+
+// TS-TODO: Type Web3.
+// TS-TODO: Review what could be private in this class.
+export class Web3JSImplementation implements ZWeb3Interface {
+
+	private _provider;
+
+	constructor(provider: any) {
+		this._provider = provider;
+	}
+
+	public get provider(): any {
+		return this._provider
+	}
+
+	public get web3(): Web3 {
+		if (!this._provider) return new Web3();
+
+		// TODO: improve provider validation for HttpProvider scenarios
+		return typeof this._provider === 'string'
+			? new Web3(new Web3.providers.HttpProvider(this._provider))
+			: new Web3(this._provider);
+	}
+
+
+	public sha3(value: string): string {
+		return Web3.utils.sha3(value);
+	}
+
+	public isAddress(address: string): boolean {
+		return Web3.utils.isAddress(address);
+	}
+
+	public get eth(): Eth { // GEORGETODO Probably remove this completely or leave it only when web3js version
+		return this.web3.eth;
+	}
+
+	public get version(): string {
+		return this.web3.version;
+	}
+
+	public contract(abi: any, atAddress?: string, options?: any): Eth.Contract {
+		return new (this.eth.Contract)(abi, atAddress, options);
+	}
+
+	public wrapContractInstance(schema: any, instance: Web3Contract): ZWeb3JSContract {
+		const self = this;
+		instance.schema = schema;
+
+		instance.new = async function (...passedArguments): Promise<Contract> {
+			const [args, options] = self.parseArguments(passedArguments, schema.abi);
+			if (!schema.linkedBytecode) throw new Error(`${schema.contractName} bytecode contains unlinked libraries.`);
+			instance.options = { ...instance.options, ...(await Contracts.getDefaultTxParams()) };
+			return new Promise((resolve, reject) => {
+				const tx = instance.deploy({ data: schema.linkedBytecode, arguments: args });
+				let transactionReceipt, transactionHash;
+				tx.send({ ...options })
+					.on('error', (error) => reject(error))
+					.on('receipt', (receipt) => transactionReceipt = receipt)
+					.on('transactionHash', (hash) => transactionHash = hash)
+					.then((deployedInstance) => { // instance != deployedInstance
+						deployedInstance = self.wrapContractInstance(schema, deployedInstance);
+						deployedInstance.deployment = { transactionReceipt, transactionHash };
+						resolve(deployedInstance);
+					})
+					.catch((error) => reject(error));
+			});
+		};
+
+		instance.at = function (address: string): Contract | never {
+			if (!self.isAddress(address)) throw new Error('Given address is not valid: ' + address);
+			const newWeb3Instance = instance.clone();
+			newWeb3Instance._address = address;
+			newWeb3Instance.options.address = address;
+			return self.wrapContractInstance(instance.schema, newWeb3Instance);
+		};
+
+		instance.link = function (libraries: { [libAlias: string]: string }): void {
+			instance.schema.linkedBytecode = instance.schema.bytecode;
+			instance.schema.linkedDeployedBytecode = instance.schema.deployedBytecode;
+
+			Object.keys(libraries).forEach((name: string) => {
+				const address = libraries[name].replace(/^0x/, '');
+				const regex = new RegExp(`__${name}_+`, 'g');
+				instance.schema.linkedBytecode = instance.schema.linkedBytecode.replace(regex, address);
+				instance.schema.linkedDeployedBytecode = instance.schema.linkedDeployedBytecode.replace(regex, address);
+			});
+		};
+
+		// TODO: Remove after web3 adds the getter: https://github.com/ethereum/web3.js/issues/2274
+		if (typeof instance.address === 'undefined') {
+			Object.defineProperty(instance, 'address', { get: () => instance.options.address });
+		}
+
+		return instance;
+	}
+
+	private parseArguments(passedArguments, abi) {
+		const constructorAbi = abi.find((elem) => elem.type === 'constructor') || {};
+		const constructorArgs = constructorAbi.inputs && constructorAbi.inputs.length > 0 ? constructorAbi.inputs : [];
+		let givenOptions = {};
+
+		if (passedArguments.length === constructorArgs.length + 1) {
+			const lastArg = passedArguments[passedArguments.length - 1];
+			if (typeof (lastArg) === 'object') {
+				givenOptions = passedArguments.pop();
+			}
+		}
+		return [passedArguments, givenOptions];
+	}
+
+	public async accounts(): Promise<string[]> {
+		return await this.eth.getAccounts();
+	}
+
+	public async defaultAccount(): Promise<string> {
+		return (await this.accounts())[0];
+	}
+
+	public toChecksumAddress(address: string): string | null {
+		if (!address) return null;
+
+		if (address.match(/[A-F]/)) {
+			if (toChecksumAddress(address) !== address) {
+				throw Error(`Given address \"${address}\" is not a valid Ethereum address or it has not been checksummed correctly.`);
+			} else return address;
+		} else {
+			log.warn(`WARNING: Address ${address} is not checksummed. Consider checksumming it to avoid future warnings or errors.`);
+			return toChecksumAddress(address);
+		}
+	}
+
+	public async estimateGas(params: any): Promise<number> {
+		return this.eth.estimateGas({ ...params });
+	}
+
+	public async getBalance(address: string): Promise<string> {
+		return this.eth.getBalance(address);
+	}
+
+	public async getCode(address: string): Promise<string> {
+		return this.eth.getCode(address);
+	}
+
+	public async hasBytecode(address): Promise<boolean> {
+		const bytecode = await this.getCode(address);
+		return bytecode.length > 2;
+	}
+
+	public async getStorageAt(address: string, position: string): Promise<string> {
+		return this.eth.getStorageAt(address, position);
+	}
+
+	public async getNode(): Promise<string> {
+		return this.eth.getNodeInfo();
+	}
+
+	public async isGanacheNode(): Promise<boolean> {
+		const nodeVersion = await this.getNode();
+		return nodeVersion.match(/TestRPC/) !== null;
+	}
+
+	public async getBlock(filter: string | number): Promise<Block> {
+		return this.eth.getBlock(filter);
+	}
+
+	public async getLatestBlock(): Promise<Block> {
+		return this.getBlock('latest');
+	}
+
+	public async getLatestBlockNumber(): Promise<number> {
+		return (await this.getLatestBlock()).number;
+	}
+
+	public async isMainnet(): Promise<boolean> {
+		return (await this.getNetworkName()) === 'mainnet';
+	}
+
+	public async getNetwork(): Promise<number> {
+		return this.eth.net.getId();
+	}
+
+	public async getNetworkName(): Promise<string> {
+		const networkId = await this.getNetwork();
+		return NETWORKS[networkId] || `dev-${networkId}`;
+	}
+
+	public async sendTransaction(params: any): Promise<TransactionReceipt> {
+		return this.eth.sendTransaction({ ...params });
+	}
+
+	public sendTransactionWithoutReceipt(params: any): Promise<string> {
+		return new Promise((resolve, reject) => {
+			this.eth.sendTransaction({ ...params }, (error, txHash) => {
+				if (error) reject(error.message);
+				else resolve(txHash);
+			});
+		});
+	}
+
+	public async getTransaction(txHash: string): Promise<Transaction> {
+		return this.eth.getTransaction(txHash);
+	}
+
+	public async getTransactionReceipt(txHash: string): Promise<TransactionReceipt> {
+		return this.eth.getTransactionReceipt(txHash);
+	}
+
+	public async getTransactionReceiptWithTimeout(txHash: string, timeout: number): Promise<TransactionReceipt> {
+		return this._getTransactionReceiptWithTimeout(txHash, timeout, new Date().getTime());
+	}
+
+	private async _getTransactionReceiptWithTimeout(txHash: string, timeout: number, startTime: number): Promise<TransactionReceipt | never> {
+		const receipt: any = await this._tryGettingTransactionReceipt(txHash);
+		if (receipt) {
+			if (receipt.status) return receipt;
+			throw new Error(`Transaction: ${txHash} exited with an error (status 0).`);
+		}
+
+		await sleep(1000);
+		const timeoutReached = timeout > 0 && new Date().getTime() - startTime > timeout;
+		if (!timeoutReached) return await this._getTransactionReceiptWithTimeout(txHash, timeout, startTime);
+		throw new Error(`Transaction ${txHash} wasn't processed in ${timeout / 1000} seconds!`);
+	}
+
+	private async _tryGettingTransactionReceipt(txHash: string): Promise<TransactionReceipt | never> {
+		try {
+			return await this.getTransactionReceipt(txHash);
+		} catch (error) {
+			if (error.message.includes('unknown transaction')) return null;
+			else throw error;
+		}
+	}
+}
diff --git a/packages/lib/src/utils/Transactions.ts b/packages/lib/src/utils/Transactions.ts
index f7b708e06..06991e5e1 100644
--- a/packages/lib/src/utils/Transactions.ts
+++ b/packages/lib/src/utils/Transactions.ts
@@ -51,8 +51,8 @@ export default {
     try {
       const from = await ZWeb3.defaultAccount();
       const gas = txParams.gas || Contracts.getArtifactsDefaults().gas || await this.estimateActualGas({ to: contractAddress, data });
-      return ZWeb3.eth().sendTransaction({ to: contractAddress, data, from, ...txParams, gas });
-    } catch(error) {
+      return ZWeb3.eth().sendTransaction({ to: contractAddress, data, from, ...txParams, gas }); // GEORGETODO fix this
+    } catch (error) {
       if (!error.message.match(/nonce too low/) || retries <= 0) throw error;
       return this.sendRawTransaction(contractAddress, data, txParams, retries - 1);
     }
@@ -143,7 +143,7 @@ export default {
     // See https://github.com/zeppelinos/zos/issues/192 for more info.
     try {
       return await this._calculateActualGas(await contractFn(...args).estimateGas({ ...txParams }));
-    } catch(error) {
+    } catch (error) {
       if (retries <= 0) throw Error(error);
       await sleep(RETRY_SLEEP_TIME);
       return this.estimateActualGasFnCall(contractFn, args, txParams, retries - 1);
diff --git a/packages/lib/test/src/artifacts/ZWeb3.test.js b/packages/lib/test/src/artifacts/ZWeb3.test.js
index 790683ccf..c0aa98afc 100644
--- a/packages/lib/test/src/artifacts/ZWeb3.test.js
+++ b/packages/lib/test/src/artifacts/ZWeb3.test.js
@@ -6,20 +6,21 @@ import Contracts from '../../../src/artifacts/Contracts'
 import { ZERO_ADDRESS } from '../../../src/utils/Addresses'
 import utils from 'web3-utils';
 import BN from 'bignumber.js';
+import IMPLEMENTATIONS from '../../../src/artifacts/web3-implementations/Implementations';
+import { JsonRpcProvider } from 'ethers/providers';
 
-contract('ZWeb3', function(accounts) {
+
+contract('ZWeb3', function (accounts) {
   accounts = accounts.map(utils.toChecksumAddress);
-  const [_, account, account1, account2] = accounts;
-  
+  const [_, account, account1, account2, account3, account4, account5, account6] = accounts;
+  const providerURL = 'http://localhost:9555';
+
   before('deploy dummy instance', async function () {
     this.DummyImplementation = Contracts.getFromLocal('DummyImplementation')
     this.impl = await this.DummyImplementation.new()
   })
 
   const shouldBehaveLikeWeb3Instance = (account, receiverAccount) => {
-    it('initializes web3 with a provider', function () {
-      ZWeb3.web3().currentProvider.should.not.be.null;
-    })
 
     it('knows a web3 instance', function () {
       ZWeb3.web3().should.not.be.null
@@ -57,7 +58,7 @@ contract('ZWeb3', function(accounts) {
     })
 
     it('tells the name of the current node', async function () {
-      const node = await ZWeb3.getNode()
+      const node = await ZWeb3.getNode();
       node.should.match(/EthereumJS TestRPC/)
     })
 
@@ -120,24 +121,22 @@ contract('ZWeb3', function(accounts) {
       })
 
       describe('get transaction', function () {
-        it('can estimate the gas of a call', async function () {
+        it('can get transaction', async function () {
           const transaction = await ZWeb3.getTransaction(this.txHash)
 
           transaction.should.be.an('object')
-          transaction.value.should.be.eq(1e18.toString())
           transaction.from.should.be.eq(accounts[0])
           transaction.to.should.be.eq(receiverAccount)
           transaction.nonce.should.not.be.null
           transaction.blockNumber.should.not.be.null
           transaction.blockHash.should.not.be.null
-          transaction.gas.should.not.be.null
           transaction.gasPrice.should.not.be.null
           transaction.hash.should.be.eq(this.txHash)
         })
       })
 
       describe('get transaction receipt', function () {
-        it('can estimate the gas of a call', async function () {
+        it('can get transaction receipt', async function () {
           const receipt = await ZWeb3.getTransactionReceipt(this.txHash)
 
           receipt.should.be.an('object')
@@ -170,7 +169,7 @@ contract('ZWeb3', function(accounts) {
 
         describe('when the transaction receipt fails continuously', function () {
           beforeEach('stub ZWeb3', function () {
-            sinon.stub(ZWeb3, 'getTransactionReceipt').throws('Error', 'unknown transaction')
+            sinon.stub(ZWeb3.implementation, 'getTransactionReceipt').throws('Error', 'unknown transaction')
           })
 
           it('fails', async function () {
@@ -183,57 +182,160 @@ contract('ZWeb3', function(accounts) {
           })
         })
       })
+    })
 
-      describe('checksum address', function () {
-        context('when address has uppercase hexa letters', function () {
-          context('when address is not well checksummed', function () {
-            it('fails', function () {
-              const address = '0x82154A1cbcAb0461D4C12ee9Cb890244eead6d9F';
-              (() => ZWeb3.toChecksumAddress(address).should.throw('Error', /is not a valid Ethereum address or it has not been checksummed correctly/));
-            });
-          });
-
-          context('when address has been checksummed properly', function () {
-            it('returns checksummed address', function () {
-              ZWeb3.toChecksumAddress(accounts[0]).should.be.eq(accounts[0]);
-            });
+    describe('checksum address', function () {
+      context('when address has uppercase hexa letters', function () {
+        context('when address is not well checksummed', function () {
+          it('fails', function () {
+            const address = '0x82154A1cbcAb0461D4C12ee9Cb890244eead6d9F';
+            (() => ZWeb3.toChecksumAddress(address).should.throw('Error', /is not a valid Ethereum address or it has not been checksummed correctly/));
           });
         });
 
-        context('when valid but not checksummed address is given', function () {
+        context('when address has been checksummed properly', function () {
           it('returns checksummed address', function () {
-            const address = accounts[0].toLowerCase();
-            ZWeb3.toChecksumAddress(address).should.be.eq(accounts[0]);
+            ZWeb3.toChecksumAddress(accounts[0]).should.be.eq(accounts[0]);
           });
         });
       });
+
+      context('when valid but not checksummed address is given', function () {
+        it('returns checksummed address', function () {
+          const address = accounts[0].toLowerCase();
+          ZWeb3.toChecksumAddress(address).should.be.eq(accounts[0]);
+        });
+      });
+    });
+
+  };
+
+  const shouldBehaveLikeWeb3JSInstance = (account, receiverAccount) => {
+    it('initializes web3 with a provider', function () {
+      ZWeb3.web3().currentProvider.should.not.be.null;
+    })
+
+    describe('transactions', function () {
+      beforeEach('sending transaction', async function () {
+        const value = (new BN(1e18)).toString(10);
+        const receipt = await ZWeb3.sendTransaction({ from: accounts[0], to: receiverAccount, value })
+        this.txHash = receipt.transactionHash;
+      })
+
+      describe('get transaction', function () {
+        it('can get transaction', async function () {
+          const transaction = await ZWeb3.getTransaction(this.txHash)
+
+          transaction.value.should.be.eq(1e18.toString())
+          transaction.gas.should.not.be.null
+        })
+      })
+
     })
+
   };
 
-  describe('initializing ZWeb3', function () {
-    context('when initializing without a provider', function () {
-      it('initializes web3 without a provider', async function () {
-        ZWeb3.initialize();
-        ZWeb3.web3().should.not.be.null;
+  const shouldBehaveLikeWeb3EthersInstance = (account, receiverAccount) => {
+    it('initializes web3 with a provider', function () {
+      ZWeb3.web3().should.not.be.null;
+    })
 
-        expect(ZWeb3.web3().currentProvider).to.be.null;
+    describe('transactions', function () {
+      beforeEach('sending transaction', async function () {
+        const value = (new BN(1e18)).toString(10);
+        const receipt = await ZWeb3.sendTransaction({ from: accounts[0], to: receiverAccount, value })
+        this.txHash = receipt.transactionHash;
       })
+
+      describe('get transaction', function () {
+        it('can get transaction', async function () {
+          const transaction = await ZWeb3.getTransaction(this.txHash)
+          transaction.value.toString().should.be.eq(1e18.toString())
+          transaction.gasLimit.should.not.be.null
+        })
+      })
+
     })
 
-    context('when initializing ZWeb3 with an http url', function () {
-      beforeEach('initialize web3', function () {
-        ZWeb3.initialize('http://localhost:9555');
+  };
+
+  describe('initializing ZWeb3', function () {
+
+    describe('initializing with ethers Implementation', function () {
+
+      context('when initializing ZWeb3 with an http url', function () {
+        beforeEach('initialize ethers', function () {
+          ZWeb3.initialize(providerURL, IMPLEMENTATIONS.ETHERS);
+        })
+
+        shouldBehaveLikeWeb3Instance(account, account4);
+        shouldBehaveLikeWeb3EthersInstance(account, account4);
+      })
+
+      context('when initializing ZWeb3 with a web3 provider', function () {
+        beforeEach('initialize ethers', function () {
+          ZWeb3.initialize(web3.currentProvider, IMPLEMENTATIONS.ETHERS);
+        })
+
+        shouldBehaveLikeWeb3Instance(account, account5);
+        shouldBehaveLikeWeb3EthersInstance(account, account5);
+      })
+
+      context('when initializing ZWeb3 with a ethers provider', function () {
+        let ethersProvider;
+        before(function () {
+          ethersProvider = new JsonRpcProvider(providerURL)
+        })
+
+        beforeEach('initialize ethers', function () {
+          ZWeb3.initialize(ethersProvider, IMPLEMENTATIONS.ETHERS);
+        })
+
+        shouldBehaveLikeWeb3Instance(account, account6);
+        shouldBehaveLikeWeb3EthersInstance(account, account6);
       })
 
-      shouldBehaveLikeWeb3Instance(account, account2);
     })
 
-    context('when initializing ZWeb3 with a web3 provider', function () {
-      beforeEach('initialize web3', function () {
-        ZWeb3.initialize(web3.currentProvider);
+    describe('initializing with Web3.js Implementation', function () {
+      context('when initializing without a provider', function () {
+        it('initializes web3 without a provider', async function () {
+          ZWeb3.initialize();
+          ZWeb3.web3().should.not.be.null;
+
+          expect(ZWeb3.web3().currentProvider).to.be.null;
+        })
+      })
+
+      context('when initializing ZWeb3 with a web3 provider', function () {
+        beforeEach('initialize web3', function () {
+          ZWeb3.initialize(web3.currentProvider);
+        })
+
+        shouldBehaveLikeWeb3Instance(account, account1);
+        shouldBehaveLikeWeb3JSInstance(account, account1);
       })
 
-      shouldBehaveLikeWeb3Instance(account, account1);
+      context('when initializing ZWeb3 with an http url', function () {
+        beforeEach('initialize web3', function () {
+          ZWeb3.initialize(providerURL);
+        })
+
+        shouldBehaveLikeWeb3Instance(account, account2);
+        shouldBehaveLikeWeb3JSInstance(account, account2);
+      })
+
+
+      context('when initializing ZWeb3 with an http url and specifying web3js implementation', function () {
+        beforeEach('initialize web3', function () {
+          ZWeb3.initialize(providerURL, IMPLEMENTATIONS.WEB3JS);
+        })
+
+        shouldBehaveLikeWeb3Instance(account, account3);
+        shouldBehaveLikeWeb3JSInstance(account, account3);
+      })
+
+
     })
 
   })
diff --git a/packages/lib/test/src/utils/Transactions.test.js b/packages/lib/test/src/utils/Transactions.test.js
index 7e3679f50..995b5727d 100644
--- a/packages/lib/test/src/utils/Transactions.test.js
+++ b/packages/lib/test/src/utils/Transactions.test.js
@@ -16,7 +16,7 @@ import Transactions, { state } from '../../../src/utils/Transactions';
 const DEFAULT_GAS = 6721975;
 const DEFAULT_PARAMS = [42, 'foo', [1, 2, 3]];
 
-contract('Transactions', function(accounts) {
+contract('Transactions', function (accounts) {
   accounts = accounts.map(utils.toChecksumAddress);
   const [_account1, account2] = accounts;
 
@@ -52,7 +52,7 @@ contract('Transactions', function(accounts) {
 
     it('uses default gas for sending transaction', async function () {
       const instance = await this.DummyImplementation.new();
-      const receipt = await instance.methods.initialize(42, 'foo', [1,2,3]).send();
+      const receipt = await instance.methods.initialize(42, 'foo', [1, 2, 3]).send();
       await assertGas(receipt.transactionHash, DEFAULT_GAS);
     });
   });
@@ -143,17 +143,17 @@ contract('Transactions', function(accounts) {
     });
 
     describe('gas price', function () {
-      beforeEach('simulate mainnet', async function() {
+      beforeEach('simulate mainnet', async function () {
         sinon.stub(ZWeb3, 'isMainnet').resolves(true)
       });
 
-      afterEach('return to testnet and undo stub', async function() {
+      afterEach('return to testnet and undo stub', async function () {
         delete state.gasPrice;
         sinon.restore();
       });
 
-      describe('uses an API to determine gas price', async function() {
-        beforeEach('stub API reply', async function() {
+      describe('uses an API to determine gas price', async function () {
+        beforeEach('stub API reply', async function () {
           sinon.stub(axios, 'get').resolves({ data: { average: 49 } })
         });
 
@@ -168,8 +168,8 @@ contract('Transactions', function(accounts) {
         });
       });
 
-      describe('does not blindly trust API', async function() {
-        beforeEach('stub API reply', async function() {
+      describe('does not blindly trust API', async function () {
+        beforeEach('stub API reply', async function () {
           sinon.stub(axios, 'get').resolves({ data: { average: 1234123412341234 } })
         });
 
@@ -261,13 +261,13 @@ contract('Transactions', function(accounts) {
     });
 
     describe('gas price', function () {
-      describe('uses an API to determine gas price', async function() {
-        beforeEach('Stub API reply and simulate mainnet', async function() {
+      describe('uses an API to determine gas price', async function () {
+        beforeEach('Stub API reply and simulate mainnet', async function () {
           sinon.stub(ZWeb3, 'isMainnet').resolves(true)
           sinon.stub(axios, 'get').resolves({ data: { average: 49 } })
         });
 
-        afterEach('return to testnet and undo stub', async function() {
+        afterEach('return to testnet and undo stub', async function () {
           delete state.gasPrice;
           sinon.restore();
         });
@@ -283,13 +283,13 @@ contract('Transactions', function(accounts) {
         });
       });
 
-      describe('does not blindly trust API', async function() {
-        beforeEach('stub API reply and simulate mainnet', async function() {
+      describe('does not blindly trust API', async function () {
+        beforeEach('stub API reply and simulate mainnet', async function () {
           sinon.stub(ZWeb3, 'isMainnet').resolves(true)
           sinon.stub(axios, 'get').resolves({ data: { average: 1234123412341234 } })
         });
 
-        afterEach('Return to testnet and undo stub', async function() {
+        afterEach('Return to testnet and undo stub', async function () {
           delete state.gasPrice;
           sinon.restore();
         });
@@ -382,13 +382,13 @@ contract('Transactions', function(accounts) {
     });
 
     describe('gas price', function () {
-      describe('uses an API to determine gas price', async function() {
-        beforeEach('Stub API reply and simulate mainnet', async function() {
+      describe('uses an API to determine gas price', async function () {
+        beforeEach('Stub API reply and simulate mainnet', async function () {
           sinon.stub(ZWeb3, 'isMainnet').resolves(true)
           sinon.stub(axios, 'get').resolves({ data: { average: 49 } })
         });
 
-        afterEach('return to testnet and undo stub', async function() {
+        afterEach('return to testnet and undo stub', async function () {
           delete state.gasPrice;
           sinon.restore();
         });
@@ -406,13 +406,13 @@ contract('Transactions', function(accounts) {
         });
       });
 
-      describe('does not blindly trust API', async function() {
-        beforeEach('stub API reply and simulate mainnet', async function() {
+      describe('does not blindly trust API', async function () {
+        beforeEach('stub API reply and simulate mainnet', async function () {
           sinon.stub(ZWeb3, 'isMainnet').resolves(true)
           sinon.stub(axios, 'get').resolves({ data: { average: 1234123412341234 } })
         });
 
-        afterEach('Return to testnet and undo stub', async function() {
+        afterEach('Return to testnet and undo stub', async function () {
           delete state.gasPrice;
           sinon.restore();
         });
@@ -484,13 +484,13 @@ contract('Transactions', function(accounts) {
       });
 
       describe('gas price', function () {
-        describe('uses an API to determine gas price', async function() {
-          beforeEach('stub API reply and simulate mainnet', async function() {
+        describe('uses an API to determine gas price', async function () {
+          beforeEach('stub API reply and simulate mainnet', async function () {
             sinon.stub(ZWeb3, 'isMainnet').resolves(true)
             sinon.stub(axios, 'get').resolves({ data: { average: 49 } })
           });
 
-          afterEach('Return to testnet and undo stub', async function() {
+          afterEach('Return to testnet and undo stub', async function () {
             delete state.gasPrice;
             sinon.restore();
           });
@@ -508,13 +508,13 @@ contract('Transactions', function(accounts) {
           });
         });
 
-        describe('does not blindly trust API', async function() {
-          beforeEach('stub API reply and simulate mainnet', async function() {
+        describe('does not blindly trust API', async function () {
+          beforeEach('stub API reply and simulate mainnet', async function () {
             sinon.stub(ZWeb3, 'isMainnet').resolves(true)
             sinon.stub(axios, 'get').resolves({ data: { average: 1234123412341234 } })
           });
 
-          afterEach('Return to testnet and undo stub', async function() {
+          afterEach('Return to testnet and undo stub', async function () {
             delete state.gasPrice;
             sinon.restore();
           });
@@ -606,13 +606,13 @@ contract('Transactions', function(accounts) {
       });
 
       describe('gas price', function () {
-        describe('uses an API to determine gas price', async function() {
-          beforeEach('stub API reply and simulate mainnet', async function() {
+        describe('uses an API to determine gas price', async function () {
+          beforeEach('stub API reply and simulate mainnet', async function () {
             sinon.stub(ZWeb3, 'isMainnet').resolves(true)
             sinon.stub(axios, 'get').resolves({ data: { average: 49 } })
           });
 
-          afterEach('Return to testnet and undo stub', async function() {
+          afterEach('Return to testnet and undo stub', async function () {
             delete state.gasPrice;
             sinon.restore();
           });
@@ -630,13 +630,13 @@ contract('Transactions', function(accounts) {
           });
         });
 
-        describe('does not blindly trust API', async function() {
-          beforeEach('stub API reply and simulate mainnet', async function() {
+        describe('does not blindly trust API', async function () {
+          beforeEach('stub API reply and simulate mainnet', async function () {
             sinon.stub(ZWeb3, 'isMainnet').resolves(true)
             sinon.stub(axios, 'get').resolves({ data: { average: 1234123412341234 } })
           });
 
-          afterEach('return to testnet and undo stub', async function() {
+          afterEach('return to testnet and undo stub', async function () {
             delete state.gasPrice;
             sinon.restore();
           });