zhsh

proposal: x/crypto/acme: Client.AcceptWithPayload to support device attestation extension

3

### Proposal Details The current RFC 8555, section 7.5.1 "Responding to Challenges" (https://datatracker.ietf.org/doc/html/rfc8555#section-7.5.1) states that the client should send an empty JSON body ("{}") to the challenge URL. That is...