{
  "height": 146,
  "block_hash": "931a32cb08a48f370358f0fe7e8e7bd176465b518ef29d27f7069486998159a4",
  "status": "confirmed",
  "bitcoin_block_height": 973004,
  "digest": {
    "alg": "sha256",
    "hex": "931a32cb08a48f370358f0fe7e8e7bd176465b518ef29d27f7069486998159a4",
    "preimage": "block:{\"at\":\"2026-10-25T01:49:23.253Z\",\"entry_count\":2,\"first_seq\":163,\"height\":146,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":164,\"merkle_root\":\"57444a7db0df8db9d6366690716fafb2d9e6aa8954a35aaeb6d2962a88953d68\",\"prev_hash\":\"893a4cbbcdbcc19751b463c22a887b5f2ef55fc06e5716974022b5d693b48064\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:58:52.918Z",
      "updated_at": "2026-10-25T04:28:50.521Z",
      "bitcoin_block_height": 973004,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add625d453eacac9b233e2d64807273dae51a9bca6648cfa5e3c28de450d87b73d20a468fa9d6b41b12686e"
        },
        {
          "type": "bitcoin",
          "block_height": 973004,
          "merkle_root": "4a3f7a119a1ebb4b77ec97b4cda3bf4150b676bf9ce4334749bfe6839309701d"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:58:52.918Z",
      "updated_at": "2026-10-25T04:28:50.521Z",
      "bitcoin_block_height": 973004,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add625d00283faaf8c219b02298cb1c573f699fe0f55eb81622e415a21b712348adcdd89d9dc9692bbdd50a"
        },
        {
          "type": "bitcoin",
          "block_height": 973004,
          "merkle_root": "4a3f7a119a1ebb4b77ec97b4cda3bf4150b676bf9ce4334749bfe6839309701d"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:58:52.918Z",
      "updated_at": "2026-10-25T01:58:52.918Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add625da176797963ce3551a5b9d199be81d35556fd0f406981b1bf6a4e8b13fe9c27cf12b40a7bcd431f26"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/146/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."
}