{
  "height": 90,
  "block_hash": "fd54b6c924be889d9be6a93e12bc3c6c66b842a85fc0a3d7e6c16bcaf435e8d3",
  "status": "confirmed",
  "bitcoin_block_height": 972977,
  "digest": {
    "alg": "sha256",
    "hex": "fd54b6c924be889d9be6a93e12bc3c6c66b842a85fc0a3d7e6c16bcaf435e8d3",
    "preimage": "block:{\"at\":\"2026-10-24T21:02:19.588Z\",\"entry_count\":1,\"first_seq\":93,\"height\":90,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":93,\"merkle_root\":\"692f6f4f87aa81505a11e1ed3f5011cfa1b32ad42383274bf299ee5e92fe9eca\",\"prev_hash\":\"4ae3634b242359562671668df9812666b2dfce4ff14d9d32e1640da09866de30\",\"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": "6add1deb64af44fea6759ebbd067c3f0941c5d654483e054ee58f8e43f6954e66b1c1dfefdc83f625c3db402"
        },
        {
          "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": "6add1deac5f36ce22f454b573f20e627373518a415bce2d06a7243438ebf1b813f030deda3df66da234384dc"
        },
        {
          "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": "6add1deaa6e2dca9b430c13efc30043d038af748480a8d713200bcd7ca2183eb2f0f40c77fd7035eb77b13b6"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/90/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."
}