{
  "height": 89,
  "block_hash": "4ae3634b242359562671668df9812666b2dfce4ff14d9d32e1640da09866de30",
  "status": "confirmed",
  "bitcoin_block_height": 972977,
  "digest": {
    "alg": "sha256",
    "hex": "4ae3634b242359562671668df9812666b2dfce4ff14d9d32e1640da09866de30",
    "preimage": "block:{\"at\":\"2026-10-24T20:57:19.567Z\",\"entry_count\":1,\"first_seq\":92,\"height\":89,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":92,\"merkle_root\":\"f6d5b7a96fe986a08bf6dd4ef9a79b3f4c8427888b220d2b6dd8b08a6070739a\",\"prev_hash\":\"e89405f28475395d1f0ce032212347ed82b0002ef91d54f70f8103b26105a301\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:06:48.979Z",
      "updated_at": "2026-10-24T22:38:37.669Z",
      "bitcoin_block_height": 972977,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add1deab0bf23a4bbd63eb06e739ddfdf2eeb114d6b22e7e8039bbce349434be5b9e9d4081ff88470989d3b"
        },
        {
          "type": "bitcoin",
          "block_height": 972977,
          "merkle_root": "b08f6a6dba1c39d8706108b269a6ebdbd557611dc77020f0b35e31cdd2c460bf"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:06:48.979Z",
      "updated_at": "2026-10-24T22:38:37.669Z",
      "bitcoin_block_height": 972977,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add1de96f7905820c066ddea51197875dbb214c77ed06e991c5304a4e14154b717f3293772bc1dc0f582890"
        },
        {
          "type": "bitcoin",
          "block_height": 972977,
          "merkle_root": "b08f6a6dba1c39d8706108b269a6ebdbd557611dc77020f0b35e31cdd2c460bf"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T21:06:48.979Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add1de9656ad5183f5b53584086dcb896c019c17b2f2a1a0f7e8937016cf7545e50f83d518db1f0e3f58b8e"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/89/anchor.ots",
  "how_to_verify": "Download the .ots proof and run `ots verify -d <block_hash> <file>.ots` with the OpenTimestamps client, which checks the Bitcoin attestation against Bitcoin block headers. The digest is the block hash: sha256 of digest.preimage, the text \"block:\" followed by the canonical block header, which is the same header the issuer signs."
}