As this feature would need extensive management for the various use cases as described in this issue (271), it would be preferable to have a different Functional Requirement for it.
This FR could look like the following:
[FR#XX] Historical Capability: The system should enable members to present historical trust attestations and signed artifacts, with the federation infrastructure capable of maintaining registry of historical keys to validate the historical data, stored and provided by the same trusted participants in the federation.
Within Trust Infrastructure Functional Requirements, historical capability of a Trust Infrastructure is briefly described within FR#14.
As this feature would need extensive management for the various use cases as described in this issue (271), it would be preferable to have a different Functional Requirement for it. This FR could look like the following:
[FR#XX] Historical Capability: The system should enable members to present historical trust attestations and signed artifacts, with the federation infrastructure capable of maintaining registry of historical keys to validate the historical data, stored and provided by the same trusted participants in the federation.