Optimism produces its very own wallet software package that's accessible for obtain on its website, which allows you to store Optimism in your Personal computer. For max security, you'll be able to store your cryptocurrencies over a focused hardware wallet such as a TREZOR wallet or even a Ledger https://financefeeds.com/nftmozaic-secures-web3-foundation-grant-to-unite-and-elevate-polkadots-nft-ecosystem/