This is flexible, but v0 can assume:

Public / On-Chain or Shared:

• identity_id
• identity_commitment (current)
• prev_commitment (for each state)
• maybe version, timestamp

Private / In Vault / Off-Chain:

• raw keys
• attributes
• policies
• any metadata backing _root and _commitment

The registry / name service (LivreID) maps:

livre_name   -> identity_id
identity_id  -> current_commitment