Genuinely surprised a simple, soulbound ERC hasn't emerged on Ethereum by now.

Anyone aware of someone working on one?

Working on Farcaster and Warpcast. Longer thoughts at https://dwr.email

ERCs are social consensus and I don’t see a lot of people working on getting alignment like this — especially in tricky identity related areas. 

This would touch wallets a fair bit, so might be something for Chain Agnostic Standards Association (CASA).

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21. hacking.
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It’s one of the few places that wallet makers gather to try and make stuff work.

Does anyone really even follow CASA standards? CAIP-10 was a great proposal on representation of addresses in a multi-chain world but didn't get any adoption

Identity related issue is exactly what it is.

Inherent problem with wallets is, like IRL, it is fungible and better remain that way despite trends to coerce people to use just one.

identifiers on data-centric layers (blockchain wallets, and even DIDs) make for a poor proxy for soul.