The Ethereum community has proposed the "linked account" identity standard ERC-8092

Jinse Finance reported that, according to Merlijn The Trader, the Ethereum community has proposed ERC-8092: a brand new “Associated Accounts” identity standard. This standard will enable accounts to: publicly associate and verify account relationships through signatures; create sub-accounts; securely delegate permissions; build portable on-chain reputations; and seamlessly collaborate across different blockchains and Layer 2s. The proposal has been published on Ethereum Magicians and GitHub.