{
  "ok": true,
  "length": 19,
  "head": "d36c874604cae4c182ba3ae40c2a9995a6cb97a59060f1d89ae9d7320035e1a3",
  "genesis": "0000000000000000000000000000000000000000000000000000000000000000",
  "rule": "hash(n) = sha256(hash(n-1) || canonicalJson({actor,event,subject,payload,seq,at}))"
}