Optimism provides its very own wallet program which is accessible for download on its website, which allows you to store Optimism on your own Pc. For maximum stability, you are able to store your cryptocurrencies over a focused hardware wallet for instance a TREZOR wallet or even a Ledger https://financefeeds.com/lightchain-ai-floki-wif-a-quest-for-a-copyright-that-could-make-someone-a-millionaire/