{
  "height": 151,
  "block_hash": "a8a129ebcb2b4a76532aa07b562c2456cdd8aca6a1ed3698305e43bf9a351e79",
  "status": "confirmed",
  "bitcoin_block_height": 973005,
  "digest": {
    "alg": "sha256",
    "hex": "a8a129ebcb2b4a76532aa07b562c2456cdd8aca6a1ed3698305e43bf9a351e79",
    "preimage": "block:{\"at\":\"2026-10-25T02:14:23.601Z\",\"entry_count\":2,\"first_seq\":173,\"height\":151,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":174,\"merkle_root\":\"c7681dfe7ef01282c0afd65aef42d95a78d15a6c35c6a5efe65157d04695598c\",\"prev_hash\":\"7e17df07dbdfeb84453f089e1fabdc98c5eb2d06d2d2d00bea6f1436e6f4b72a\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:18:52.921Z",
      "updated_at": "2026-10-25T04:28:50.521Z",
      "bitcoin_block_height": 973005,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add670ef832a9bfbcf9b79fec510495e2f5c5ae646f454865c429856ff3ccd5dc35dceee9d4d7aff5183ef2"
        },
        {
          "type": "bitcoin",
          "block_height": 973005,
          "merkle_root": "cc85efef5df8fdca5c847d30ae06884a21a18bddeb1fc8c0fe7e92c7fab5b740"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:18:52.921Z",
      "updated_at": "2026-10-25T04:28:50.521Z",
      "bitcoin_block_height": 973005,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add670e129edb2e74b03947067eca331b17a27a7f6ec990ed9e3495b7bcf3388366a2a34a62ec33aa642df5"
        },
        {
          "type": "bitcoin",
          "block_height": 973005,
          "merkle_root": "cc85efef5df8fdca5c847d30ae06884a21a18bddeb1fc8c0fe7e92c7fab5b740"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T02:18:52.921Z",
      "updated_at": "2026-10-25T02:18:52.921Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add670f48758ca513659c6abe783a9a87b6b9227a15035203c0e992be97fde24f654b50e47963ffe156c869"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/151/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."
}