Cryptographically secured temporary delegation of signing authority

Another use of DCKR is to permit adhoc temporary delegation of signing authority without incurring a need for secure key distribution among those who wish to validate signatures, and without a need for alerting those who wish to validate signatures that such delegation has expired.

To temporarily delegate signing authority, you simply share a future key with the individual, organization, or device (etc) which you wish to sign on your behalf. The date of the future key which you share is automatically the date on which that delegation expires, because the entity to which you have delegated signing authorities can derive earlier signing keys as required - but not later signing keys.