Expand description
NIP-01 user metadata (kind 0 event content).
Per NIP-01, the content of a kind: 0 event is a JSON-encoded user
profile. NIP-24 layered additional public-profile fields on top of the
original four (name, about, picture, nip05); this struct models
every standardised field and preserves any unknown ones inside
Metadata::custom so future NIP extensions stay round-trippable.