Since v0.56.0 Remix IDE comes with a built-in verification plugin that allows you to verify your contracts on multiple verifiers.To verify your contracts on Remix:
Turn on the plugin “CONTRACT VERIFICATION” from the plugin manager.
On the File Explorer, select and compile the contract you want to verify.
On the Contract Verification plugin, select the Contract Name, Chain, and input the contract address. Add constructor arguments if needed.
Click “Verify”. You can see the process on the “Receipts” tab.