Include metadata about the DID in the DIDDoc

[swcurran]

Include in the DIDDoc the following information:

• versionId (required). Must be 0 for the initial DIDDoc and incremented per DIDDoc update.
• created — a locally defined (by the DID controller) time when the initial DIDDoc was created.
• updated — a locally defined (by the DID controller) time when this DIDDoc was created.
• previousProof — the proof item from the previous version of the DIDDoc.
  • An empty array [] for the initial DIDDoc.

[andrewwhitehead]

It would need something like previousHash (maybe within the proof block), but I'm not sure why it needs the previous proof?

[swcurran]

Sounds good — I’ll update the description.

[andrewwhitehead]

Just to add, the DID Core spec defines created, updated and versionId as document metadata that are not (normally) included in the document itself. But I don't see why they couldn't be.

[andrewwhitehead]

I think we're leaning toward removing these from the document to avoid using a custom @context.

• previousHash would be stored in the log
• created would be the first timestamp in the log
• updated would be the latest
• versionId would be the line number

We would need to hash the previousHash and timestamp into the CID, and likely set the domain of the proofs to the CID to tie them together.

[swcurran]

Resolved by the log format #20 .