{
  "canonical_recipient": "Alice+offers@example.net",
  "issuer": "https://attester.example/issuer",
  "sender_id": "https://attester.example/senders/example-company",
  "sender_epoch": 1,
  "type_id": "https://types.example/promotional",
  "type_version": 1,
  "evaluation_time": 1800000000
}