{"ok":true,"available":true,"algorithm":"ed25519","key_id":"cerberus-attest-v1","public_key":"Upj2pLLBeog7m3aAV0zD4nFEmTzuX3MscNj6VTrL1q8=","public_key_encoding":"base64 raw ed25519 (32 bytes)","canonicalization":"JSON of the `claim` object with sorted keys and (',',':') separators, UTF-8; verify the signature over those exact bytes."}