W3C TR did-core: "DID Decentralized Identifiers 1.0": https://www.w3.org/TR/did-core/
W3C TR did-use-cases: "Use Cases and Requirements for Decentralized Identifiers" https://www.w3.org/TR/did-use-cases/
"Email addresses are not good 'permanent' identifiers for accounts" (2024) https://news.ycombinator.com/item?id=38823817#38831952
A person can generate (and optionally register) additional DIDs if they please.
A person can request additional ORCIDs if they please