Stephen Downes

Is this the one? "Keytrace lets you cryptographically link your atproto/Bluesky account to external accounts across the web." It's based on the distributed ID specification (DID) and you can use Keytrace to publish yours (if you have a Bluesky account, you have a DID, but there are other ways of getting one as well). I'm not posting a DID for myself just yet (Ben Werdmuller has done his) because I'm, working on a plan to generate my own DID in my own software.