Mirror writing NFTs are deployed to Optimism, a layer 2 network on Ethereum. This reduces gas fees for minting and collecting writing NFTs.
To add Optimism to Metamask, start by opening up the Metamask browser extension, click the network you are currently using at the top, and then click Add Network in the popup.
Next, enter the following parameters:
- Network Name: Optimism
- New RPC URL: https://mainnet.optimism.io
- Chain ID: 10
- Currency Symbol: ETH
- Block Explorer URL: https://optimistic.etherscan.io/
And click Save.
Congrats, you can now use Optimism.