Use Etherscan V2 API for verification

New Etherscan API key can verify on 50+ chains:
https://docs.etherscan.io/etherscan-v2

Author: mikyjo

.env.example

@@ -7,6 +7,4 @@ REPLY_TO_THREAD_AMOUNT=1000
 REPOST_AMOUNT=1000
 REPOST_WITH_COMMENT_AMOUNT=1000
 TOKEN_ANALYSIS_AMOUNT=1000
-ETH_MAINNET_VERIFY_KEY=XXXXXXXXXXXXXXXXXXXXXXX
-BASE_MAINNET_VERIFY_KEY=XXXXXXXXXXXXXXXXXXXXXXX
-POLYGON_API_VERIFY_KEY=XXXXXXXXXXXXXXXXXXXXXXX
+ETHERSCAN_API_KEY=XXXXXXXXXXXXXXXXXXXXXXX

README.md

@@ -49,7 +49,7 @@ PRIVATE_KEY="0xPRIVATE_KEY" ERC20_ADDRESS="0xERC20_ADDRESS" npx hardhat run --ne
 ### ERC20 contract
 
 ```
-PRIVATE_KEY="0xPRIVATE_KEY" npx hardhat run --network localhost scripts/deploy.js
+PRIVATE_KEY="0xPRIVATE_KEY" npx hardhat run --network localhost scripts/deployToken.js
 ```
 
 To deploy on another chain, specify the network key name (e.g. `baseSepolia`) from `hardhat.config.js`.
@@ -76,12 +76,12 @@ PRIVATE_KEY="0xPRIVATE_KEY" XREQUEST_PROCESSOR_ADDRESS="0xPROCESSOR_ADDRESS" npx
 
 ## Verify deployed contracts
 
-Populate `BASE_API_VERIFY_KEY` or other, depending on the deployed network
+Populate `ETHERSCAN_API_KEY` or other, depending on the deployed network
 
 To verify run:
 
 ```
-BASE_API_VERIFY_KEY="API_KEY" npx hardhat verify "DEPLOYED_CONTRACT_ADDR" --network base "Constructor arg 1" "Constructor arg 2"
+ETHERSCAN_API_KEY="API_KEY" npx hardhat verify "DEPLOYED_CONTRACT_ADDR" --network base "Constructor arg 1" "Constructor arg 2"
 ```
 
 To list all supported networks by hardhat and their chainIds:

hardhat.config.js

@@ -43,11 +43,7 @@ const hardhatConfig = {
     },
   },
   etherscan: {
-    apiKey: {
-      mainnet: process.env.ETH_MAINNET_VERIFY_KEY ? process.env.ETH_MAINNET_VERIFY_KEY : undefined,
-      base: process.env.BASE_MAINNET_VERIFY_KEY ? process.env.BASE_MAINNET_VERIFY_KEY : undefined,
-      polygon: process.env.POLYGON_API_VERIFY_KEY ? process.env.POLYGON_API_VERIFY_KEY : undefined,
-    },
+    apiKey: process.env.ETHERSCAN_API_KEY ? process.env.ETHERSCAN_API_KEY : undefined,
   },
   settings: {
     optimizer: {