The base ("old") revision the claims resolve entries[].base against.
OptionalcreatedISO 8601 creation timestamp, when the producer supplied one.
The claims, sorted by (base, here) for a reviewable, stable file.
The head ("new") revision the claims resolve entries[].here against.
OptionalkeyThe key scheme the entries' base/here keys were taken under (issue
#4955): an authored property such as Pset_Asset.AssetId, or Tag.
Absent means GlobalId, so a version-1 file written before the field
existed is still valid. identityMapSidecarMismatches reports a
scheme mismatch like a digest mismatch, because a GlobalId-keyed map
replayed under an authored key would otherwise apply nothing, silently.
1, or 2 when keyProperty is present.
A reviewed set of identity claims, scoped to the exact pair of revisions it was verified against.