{
  "valid": true,
  "checked": 15,
  "from": 1,
  "to": 15,
  "head": {
    "seq": 15,
    "hash": "7c234f98f63fab82fef8ead1d4cc6f4011aa0689538a9375b6b5676488b0d623"
  },
  "next": null,
  "method": "hash = SHA-256(canonical JSON of {prev, seq, ts, type, actor_id, actor_kind, subject, data}); canonical JSON sorts object keys."
}