Verify contracts on arbitrum goerli (#1265)

* Verify contracts on arbitrum goerli

.npmrc

@@ -0,0 +1,2 @@
+# Prevent errors due to missing peer dependencies.
+auto-install-peers=true

README.md

@@ -569,7 +569,12 @@ After running `hardhat deploy`, run the [etherscan-verify](./bin/etherscan-verif
     etherscan-verify goerli
 
 This requires the `ETHERSCAN_API_KEY` env var to be set. Keys can be found at
-https://etherscan.io/myapikey.
+
+- goerli: https://etherscan.io/myapikey.
+- arbitrum goerli: https://arbiscan.io/myapikey
+
+For arbitrum goerli replace `goerli` with `arbitrum_goerli` in the above
+commands and set the api key via `ARBISCAN_API_KEY` instead.
 
 ## Official assets
 

bin/etherscan-verify

@@ -9,19 +9,7 @@
 #
 # Verify contracts on etherscan.
 #
-# This requires the `ETHERSCAN_API_KEY` env var to be set. Keys can be found at
-# https://etherscan.io/myapikey.
-#
-# Usage:
-#
-#       hardhat deploy --network NETWORK
-#       etherscan-verify NETWORK
-#
-# For example
-#
-#       hardhat deploy --network goerli
-#       etherscan-verify goerli
-#
+# See "Etherscan verification" section in README.md for usage instructions.
 set -euo pipefail
 
 NETWORK=$1
@@ -73,6 +61,9 @@ function ensure_verified() {
     fi
 }
 
+echo "Removing old artifacts."
+rm -rf contracts/artifacts
+
 echo Verifying RescueLib
 ensure_verified hardhat verify --network $NETWORK $RESCUE_LIB_ADDRESS
 

contracts/hardhat.config.ts

@@ -54,9 +54,6 @@ subtask(TASK_COMPILE_SOLIDITY_GET_SOLC_BUILD, async (args: any, _hre, runSuper)
 
 const config: HardhatUserConfig = {
   defaultNetwork: "localhost",
-  etherscan: {
-    apiKey: process.env.ETHERSCAN_API_KEY,
-  },
   namedAccounts: {
     deployer: 0,
     tokenOwner: 1,
@@ -91,6 +88,22 @@ const config: HardhatUserConfig = {
       tags: ["local"],
     },
   },
+  etherscan: {
+    apiKey: {
+      arbitrumGoerli: process.env.ARBISCAN_API_KEY || "",
+      goerli: process.env.ETHERSCAN_API_KEY || "",
+    },
+    customChains: [
+      {
+        network: "arbitrumGoerli",
+        chainId: 421613,
+        urls: {
+          apiURL: "https://api-goerli.arbiscan.io/api",
+          browserURL: "https://goerli.arbiscan.io/",
+        },
+      },
+    ],
+  },
   solidity: {
     version: process.env.SOLC_VERSION ? process.env.SOLC_VERSION : "0.8.0",
     settings: {

contracts/package.json

@@ -30,7 +30,7 @@
     "@ethersproject/bytes": "^5.5.0",
     "@ethersproject/providers": "^5.5.0",
     "@nomiclabs/hardhat-ethers": "^2.0.2",
-    "@nomiclabs/hardhat-etherscan": "^3.0.3",
+    "@nomiclabs/hardhat-etherscan": "^3.1.0",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
     "@typechain/ethers-v5": "8.0.2",
     "@typechain/hardhat": "^3.0.0",