Web3Auth

Web3Auth is a wallet-as-a-service offering under Consensys that uses MPC and account abstraction to give dApps seed-phrase-free, social-login wallets for application developers and end users who want a lower entry barrier. It targets the seed-phrase burden of self-custody wallets that drives mass user drop-off: the scheme uses 2-of-3 threshold signatures to shard the key, one share on device, one on the service, one held through the user's social login, with any two reconstructing a signature so users need no seed phrase. Account abstraction enables gas sponsorship and social recovery, and the wallet embeds in apps as an SDK.

In wallet division of labor it complements self-custody wallets like MetaMask on usability versus autonomy and competes with peer WaaS providers such as Privy for the entry point. In practice, users log in with Google or email inside an app to spawn a sharded wallet, signing completes in the background via multi-party computation, and social recovery takes over on device loss. The service-held key share still rests with the operator, so while usability rises, the wallet's security model also depends on the operator's key-share availability and isolation.