OISY is a fully-decentralized, fully-onchain, in-browser Web3 wallet providing multichain functionality. It is created by advanced smart contracts hosted on the Internet Computer (ICP) blockchain that serve web experiences to users, and can custody their tokens using "chain key" technology.
Users authenticate to the smart contracts over the web using passkey technology, and cause the smart contracts to seamlessly sign transactions for them through their interactions with the web experience.