# title
POPCORN payload-bound witness request v1

# properties.payload_digest.properties.value.description
Canonical unpadded base64url encoding of exactly 32 bytes.

# properties.nonce.description
Canonical unpadded base64url encoding of 32 random bytes.

# properties.previous_attestation_digest.anyOf[].properties.value.description
Canonical unpadded base64url encoding of exactly 32 bytes.