{
  "height": 147,
  "block_hash": "a6276c0c80e44678e5a2f33a89ce6621cded463e3e6650e4142819a947109bba",
  "status": "confirmed",
  "bitcoin_block_height": 973004,
  "digest": {
    "alg": "sha256",
    "hex": "a6276c0c80e44678e5a2f33a89ce6621cded463e3e6650e4142819a947109bba",
    "preimage": "block:{\"at\":\"2026-10-25T01:54:23.485Z\",\"entry_count\":2,\"first_seq\":165,\"height\":147,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":166,\"merkle_root\":\"5dd4ba1c54ee1df7f553ed5bf08fd9cba45f2d92f031b3ac4637c59f84e65536\",\"prev_hash\":\"931a32cb08a48f370358f0fe7e8e7bd176465b518ef29d27f7069486998159a4\",\"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": "6add625e63f149fae6e750fd2a9435e7fdaff3be12ad123d0be0682037b5f901b43b187810f0f2f1d83ba3b3"
        },
        {
          "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": "6add625e332b82a2c8b6a43064fe6c930d41f7de1032c734c9d00398ad069cbd480a9468fe7f725029c7f9fe"
        },
        {
          "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": "6add625ef5bc1b6da6ca068d3c5df4acedf13dfb035d035b4e092e0b8456b610f7f640da55c8d7e089dfbe89"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/147/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."
}