[evm] Verifying shimmer_testnet and neon_devnet with hardhat

target_chains/ethereum/contracts/VERIFY.md

@@ -39,3 +39,17 @@ dependencies, so it fails to parse the `HDWallet` arguments in our
 `truffle-config.json`. As a quick workaround, we backport the patch to `0.5.11`
 by applying the `truffle-verify-constants.patch` file, which the `npm run verify` script does transparently. Once the toolchain has been upgraded and the
 errors fixed, this patch can be removed.
+
+## Verifying with hardhat
+
+Some chains might require users to verify with hardhat. Here are the additional steps :
+
+- Add the chain to `networks` in `hardhat.config.ts` (equivalent of `truffle-config.js`)
+- Add the explorer parameters to `etherscan` in `hardhat.config.ts`
+- Run :
+
+```
+MNEMONIC=... npx hardhat verify 0x354bF866A4B006C9AF9d9e06d9364217A8616E12 --network shimmer_testnet
+```
+
+This process is somehow flaky. After running it, check the explorer as sometimes it will work even when it says it failed.

target_chains/ethereum/contracts/hardhat.config.ts

@@ -1,8 +1,8 @@
-import "@matterlabs/hardhat-zksync-deploy";
-import "@matterlabs/hardhat-zksync-solc";
 import "@nomiclabs/hardhat-etherscan";
 import "@openzeppelin/hardhat-upgrades";
-import "@matterlabs/hardhat-zksync-verify";
+import "@matterlabs/hardhat-zksync-deploy";
+import "@matterlabs/hardhat-zksync-solc";
+// import "@matterlabs/hardhat-zksync-verify"; UNCOMMENT THIS AND INSTALL THIS PACKAGE TO VERIFY ZKSYNC
 
 module.exports = {
   zksolc: {
@@ -32,6 +32,44 @@ module.exports = {
       verifyURL:
         "https://zksync2-mainnet-explorer.zksync.io/contract_verification",
     },
+    neon_devnet: {
+      url: "https://devnet.neonevm.org",
+      chainId: 245022926,
+      accounts: {
+        mnemonic: process.env.MNEMONIC,
+      },
+    },
+    shimmer_testnet: {
+      url: "https://json-rpc.evm.testnet.shimmer.network",
+      chainId: 1070,
+      accounts: {
+        mnemonic: process.env.MNEMONIC,
+      },
+    },
+  },
+  etherscan: {
+    apiKey: {
+      neon_devnet: "there_should_be_a_dummy_value_here_to_avoid_error",
+      shimmer_testnet: "there_should_be_a_dummy_value_here_to_avoid_error",
+    },
+    customChains: [
+      {
+        network: "neon_devnet",
+        chainId: 245022926,
+        urls: {
+          apiURL: "https://devnet-api.neonscan.org/hardhat/verify",
+          browserURL: "https://devnet.neonscan.org",
+        },
+      },
+      {
+        network: "shimmer_testnet",
+        chainId: 1070,
+        urls: {
+          apiURL: "https://explorer.evm.testnet.shimmer.network/api",
+          browserURL: "https://explorer.evm.testnet.shimmer.network",
+        },
+      },
+    ],
   },
   solidity: {
     version: "0.8.4",

target_chains/ethereum/contracts/package.json

@@ -27,8 +27,7 @@
     "@certusone/wormhole-sdk": "^0.9.9",
     "@matterlabs/hardhat-zksync-deploy": "^0.6.2",
     "@matterlabs/hardhat-zksync-solc": "^0.3.14",
-    "@matterlabs/hardhat-zksync-verify": "^0.1.3",
-    "@nomiclabs/hardhat-etherscan": "^3.1.2",
+    "@nomiclabs/hardhat-etherscan": "^3.1.7",
     "@openzeppelin/contracts": "^4.5.0",
     "@openzeppelin/contracts-upgradeable": "^4.5.2",
     "@openzeppelin/hardhat-upgrades": "^1.22.1",