diff --git a/hardhat.config.js b/hardhat.config.js
index febec86..2a1f3c9 100644
--- a/hardhat.config.js
+++ b/hardhat.config.js
@@ -2,6 +2,7 @@
 require('@typechain/hardhat')
 require('@nomiclabs/hardhat-ethers')
 require('@nomiclabs/hardhat-waffle')
+require('@nomiclabs/hardhat-etherscan')
 require('dotenv').config()
 
 task('hasher', 'Compile Poseidon hasher', () => {
@@ -67,6 +68,9 @@ const config = {
           },
     },
   },
+  etherscan: {
+    apiKey: process.env.ETHERSCAN_KEY,
+  },
   mocha: {
     timeout: 600000000,
   },
diff --git a/package.json b/package.json
index d28f49d..e56513c 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,7 @@
     "typechain": "^5.1.2"
   },
   "devDependencies": {
+    "@nomiclabs/hardhat-etherscan": "^2.1.8",
     "babel-eslint": "^10.1.0",
     "eslint": "^7.28.0",
     "eslint-config-prettier": "^8.3.0",
diff --git a/yarn.lock b/yarn.lock
index 61698f8..92d6463 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -341,6 +341,17 @@
     "@ethersproject/logger" "^5.4.0"
     "@ethersproject/rlp" "^5.4.0"
 
+"@ethersproject/address@^5.0.2":
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/@ethersproject/address/-/address-5.5.0.tgz#bcc6f576a553f21f3dd7ba17248f81b473c9c78f"
+  integrity sha512-l4Nj0eWlTUh6ro5IbPTgbpT4wRbdH5l8CQf7icF7sb/SI3Nhd9Y9HzhonTSTi6CefI0necIw7LJqQPopPLZyWw==
+  dependencies:
+    "@ethersproject/bignumber" "^5.5.0"
+    "@ethersproject/bytes" "^5.5.0"
+    "@ethersproject/keccak256" "^5.5.0"
+    "@ethersproject/logger" "^5.5.0"
+    "@ethersproject/rlp" "^5.5.0"
+
 "@ethersproject/base64@5.4.0", "@ethersproject/base64@^5.4.0":
   version "5.4.0"
   resolved "https://registry.yarnpkg.com/@ethersproject/base64/-/base64-5.4.0.tgz#7252bf65295954c9048c7ca5f43e5c86441b2a9a"
@@ -365,6 +376,15 @@
     "@ethersproject/logger" "^5.4.0"
     bn.js "^4.11.9"
 
+"@ethersproject/bignumber@^5.5.0":
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/@ethersproject/bignumber/-/bignumber-5.5.0.tgz#875b143f04a216f4f8b96245bde942d42d279527"
+  integrity sha512-6Xytlwvy6Rn3U3gKEc1vP7nR92frHkv6wtVr95LFR3jREXiCPzdWxKQ1cx4JGQBXxcguAwjA8murlYN2TSiEbg==
+  dependencies:
+    "@ethersproject/bytes" "^5.5.0"
+    "@ethersproject/logger" "^5.5.0"
+    bn.js "^4.11.9"
+
 "@ethersproject/bytes@5.4.0", "@ethersproject/bytes@>=5.0.0-beta.129", "@ethersproject/bytes@^5.0.4", "@ethersproject/bytes@^5.4.0":
   version "5.4.0"
   resolved "https://registry.yarnpkg.com/@ethersproject/bytes/-/bytes-5.4.0.tgz#56fa32ce3bf67153756dbaefda921d1d4774404e"
@@ -372,6 +392,13 @@
   dependencies:
     "@ethersproject/logger" "^5.4.0"
 
+"@ethersproject/bytes@^5.5.0":
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/@ethersproject/bytes/-/bytes-5.5.0.tgz#cb11c526de657e7b45d2e0f0246fb3b9d29a601c"
+  integrity sha512-ABvc7BHWhZU9PNM/tANm/Qx4ostPGadAuQzWTr3doklZOhDlmcBqclrQe/ZXUIj3K8wC28oYeuRa+A37tX9kog==
+  dependencies:
+    "@ethersproject/logger" "^5.5.0"
+
 "@ethersproject/constants@5.4.0", "@ethersproject/constants@>=5.0.0-beta.128", "@ethersproject/constants@^5.0.4", "@ethersproject/constants@^5.4.0":
   version "5.4.0"
   resolved "https://registry.yarnpkg.com/@ethersproject/constants/-/constants-5.4.0.tgz#ee0bdcb30bf1b532d2353c977bf2ef1ee117958a"
@@ -454,11 +481,24 @@
     "@ethersproject/bytes" "^5.4.0"
     js-sha3 "0.5.7"
 
+"@ethersproject/keccak256@^5.5.0":
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/@ethersproject/keccak256/-/keccak256-5.5.0.tgz#e4b1f9d7701da87c564ffe336f86dcee82983492"
+  integrity sha512-5VoFCTjo2rYbBe1l2f4mccaRFN/4VQEYFwwn04aJV2h7qf4ZvI2wFxUE1XOX+snbwCLRzIeikOqtAoPwMza9kg==
+  dependencies:
+    "@ethersproject/bytes" "^5.5.0"
+    js-sha3 "0.8.0"
+
 "@ethersproject/logger@5.4.1", "@ethersproject/logger@>=5.0.0-beta.129", "@ethersproject/logger@^5.0.5", "@ethersproject/logger@^5.4.0":
   version "5.4.1"
   resolved "https://registry.yarnpkg.com/@ethersproject/logger/-/logger-5.4.1.tgz#503bd33683538b923c578c07d1c2c0dd18672054"
   integrity sha512-DZ+bRinnYLPw1yAC64oRl0QyVZj43QeHIhVKfD/+YwSz4wsv1pfwb5SOFjz+r710YEWzU6LrhuSjpSO+6PeE4A==
 
+"@ethersproject/logger@^5.5.0":
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/@ethersproject/logger/-/logger-5.5.0.tgz#0c2caebeff98e10aefa5aef27d7441c7fd18cf5d"
+  integrity sha512-rIY/6WPm7T8n3qS2vuHTUBPdXHl+rGxWxW5okDfo9J4Z0+gRRZT0msvUdIJkE4/HS29GUMziwGaaKO2bWONBrg==
+
 "@ethersproject/networks@5.4.2", "@ethersproject/networks@^5.4.0":
   version "5.4.2"
   resolved "https://registry.yarnpkg.com/@ethersproject/networks/-/networks-5.4.2.tgz#2247d977626e97e2c3b8ee73cd2457babde0ce35"
@@ -522,6 +562,14 @@
     "@ethersproject/bytes" "^5.4.0"
     "@ethersproject/logger" "^5.4.0"
 
+"@ethersproject/rlp@^5.5.0":
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/@ethersproject/rlp/-/rlp-5.5.0.tgz#530f4f608f9ca9d4f89c24ab95db58ab56ab99a0"
+  integrity sha512-hLv8XaQ8PTI9g2RHoQGf/WSxBfTB/NudRacbzdxmst5VHAqd1sMibWG7SENzT5Dj3yZ3kJYx+WiRYEcQTAkcYA==
+  dependencies:
+    "@ethersproject/bytes" "^5.5.0"
+    "@ethersproject/logger" "^5.5.0"
+
 "@ethersproject/sha2@5.4.0", "@ethersproject/sha2@^5.4.0":
   version "5.4.0"
   resolved "https://registry.yarnpkg.com/@ethersproject/sha2/-/sha2-5.4.0.tgz#c9a8db1037014cbc4e9482bd662f86c090440371"
@@ -662,6 +710,19 @@
   resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.0.2.tgz#c472abcba0c5185aaa4ad4070146e95213c68511"
   integrity sha512-6quxWe8wwS4X5v3Au8q1jOvXYEPkS1Fh+cME5u6AwNdnI4uERvPlVjlgRWzpnb+Rrt1l/cEqiNRH9GlsBMSDQg==
 
+"@nomiclabs/hardhat-etherscan@^2.1.8":
+  version "2.1.8"
+  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-etherscan/-/hardhat-etherscan-2.1.8.tgz#e206275e96962cd15e5ba9148b44388bc922d8c2"
+  integrity sha512-0+rj0SsZotVOcTLyDOxnOc3Gulo8upo0rsw/h+gBPcmtj91YqYJNhdARHoBxOhhE8z+5IUQPx+Dii04lXT14PA==
+  dependencies:
+    "@ethersproject/abi" "^5.1.2"
+    "@ethersproject/address" "^5.0.2"
+    cbor "^5.0.2"
+    debug "^4.1.1"
+    fs-extra "^7.0.1"
+    node-fetch "^2.6.0"
+    semver "^6.3.0"
+
 "@nomiclabs/hardhat-waffle@^2.0.1":
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-waffle/-/hardhat-waffle-2.0.1.tgz#5d43654fba780720c5033dea240fe14f70ef4bd2"
@@ -2277,6 +2338,14 @@ caseless@~0.12.0:
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
   integrity sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=
 
+cbor@^5.0.2:
+  version "5.2.0"
+  resolved "https://registry.yarnpkg.com/cbor/-/cbor-5.2.0.tgz#4cca67783ccd6de7b50ab4ed62636712f287a67c"
+  integrity sha512-5IMhi9e1QU76ppa5/ajP1BmMWZ2FHkhAhjeVKQ/EFCgYSEaeVaoGtL7cxJskf9oCCk+XjzaIdc3IuU/dbA/o2A==
+  dependencies:
+    bignumber.js "^9.0.1"
+    nofilter "^1.0.4"
+
 chai@^4.2.0, chai@^4.3.4:
   version "4.3.4"
   resolved "https://registry.yarnpkg.com/chai/-/chai-4.3.4.tgz#b55e655b31e1eac7099be4c08c21964fce2e6c49"
@@ -6700,6 +6769,11 @@ node-gyp-build@^4.2.0:
   resolved "https://registry.yarnpkg.com/node-gyp-build/-/node-gyp-build-4.3.0.tgz#9f256b03e5826150be39c764bf51e993946d71a3"
   integrity sha512-iWjXZvmboq0ja1pUGULQBexmxq8CV4xBhX7VDOTbL7ZR4FOowwY/VOtRxBN/yKxmdGoIp4j5ysNT4u3S2pDQ3Q==
 
+nofilter@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/nofilter/-/nofilter-1.0.4.tgz#78d6f4b6a613e7ced8b015cec534625f7667006e"
+  integrity sha512-N8lidFp+fCz+TD51+haYdbDGrcBWwuHX40F5+z0qkUjMJ5Tp+rdSuAkMJ9N9eoolDlEVTf6u5icM+cNKkKW2mA==
+
 normalize-package-data@^2.3.2:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/normalize-package-data/-/normalize-package-data-2.5.0.tgz#e66db1838b200c1dfc233225d12cb36520e234a8"