Add mechanism to retrieve historical status list information.

[msporny]

This PR is an attempt to address issue #94 by adding an optional normative mechanism to retrieve historical status list information.

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[dlongley]

Accepting this -- but haven't put much thought into the side effects (privacy considerations, so on) yet.

[decentralgabe]

thanks for adding this. it would be great to have an example query.

[decentralgabe]

I would consider adding a sentence that says something like...

"Providing such a mechanism to dereference the status list as of a particular point in time lends itself to allowing for the functionality of determining as precise as possible timestamps of status changes, at the issuers discretion"

[msporny]

Done in 804df0e.

[dmitrizagidulin]

👍

[TallTed]

Suggested change

	dereferencing such a timestamped URL MUST be a status list credential containing
	either the status list as it existed at the given point in time, or a
	<a href="#STATUS_RETRIEVAL_ERROR">STATUS_RETRIEVAL_ERROR</a>.
	dereferencing such a timestamp-parameterized URL MUST be a status list credential
	containing either the status list as it existed at the given point in time, or a
	<a href="#STATUS_RETRIEVAL_ERROR">STATUS_RETRIEVAL_ERROR</a>.

[TallTed]

or

Suggested change

	dereferencing such a timestamped URL MUST be a status list credential containing
	either the status list as it existed at the given point in time, or a
	<a href="#STATUS_RETRIEVAL_ERROR">STATUS_RETRIEVAL_ERROR</a>.
	dereferencing such a timestamp-parameterized URL MUST be either a status list
	credential containing the status list as it existed at the given point in time,
	or a <a href="#STATUS_RETRIEVAL_ERROR">STATUS_RETRIEVAL_ERROR</a>.

[msporny]

Fixed in dfa5e31.

[iherman]

The issue was discussed in a meeting on 2024-01-10

• no resolutions were taken

View the transcript

3.3. Add mechanism to retrieve historical status list information. (pr vc-bitstring-status-list#112)

See github pull request vc-bitstring-status-list#112.

Manu Sporny: request to retrieve historical status list.
… so option to add date-time to the request.
… some discussions about what to do if the issuer does not have the status list at the requested date-time.
… nobody has implemented this feature yet, so should we fully specify this feature or wait for implementation experience.

David Chadwick: We would like implementer feedback, but we shouldn't have a spec that has multiple options on the reply - that might be confusing to implementers. Select one option for the reply (when you don't have one, we should say you MUST/SHOULD return an error) vs. "it's up to implementers".

Manu Sporny: we can make this change.

[msporny]

Normative, multiple reviews, changes requested and made, no objections, merging.