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A Tweet in that thread shared this, which I also had not known of before:
Oblivious Decentralized Identifier Service (ODIS) https://docs.celo.org/celo-codebase/protocol/odis
Celo is a L1 blockchain project, with CELO token, and then the following stablecoins: cUSD, cEUR, and cREAL (BRL)