The "previous_key" element added in #435 is not necessary in practice because the AS should always be able to look up the current key value based on the access token, and the signature using the previous key proves possession of that key separate from any presentation of the key value or reference.
The "previous_key" element added in #435 is not necessary in practice because the AS should always be able to look up the current key value based on the access token, and the signature using the previous key proves possession of that key separate from any presentation of the key value or reference.
Closed by #468