{
  "height": 154,
  "block_hash": "09d91e903d3b193185574b6dcbbd95f0b8167b7139002830b324d0d0a3233820",
  "status": "confirmed",
  "bitcoin_block_height": 973006,
  "digest": {
    "alg": "sha256",
    "hex": "09d91e903d3b193185574b6dcbbd95f0b8167b7139002830b324d0d0a3233820",
    "preimage": "block:{\"at\":\"2026-10-25T02:29:23.629Z\",\"entry_count\":3,\"first_seq\":179,\"height\":154,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":181,\"merkle_root\":\"9334f1d1a58ffadbc9c9655678c2b7c941554c74f165223e5cc5b0d4df167bce\",\"prev_hash\":\"d61fc7728f7ba584f7b3121ff4f6cad4170746e2dad95b81177d3d2d0d5a4fb1\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:38:52.921Z",
      "updated_at": "2026-10-25T04:40:53.358Z",
      "bitcoin_block_height": 973008,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add6bbe9a49668e9fb85c0dd9af3fb54b484347692e1af92f530a75f6709abbcddb417baed7910eb3dac295"
        },
        {
          "type": "bitcoin",
          "block_height": 973008,
          "merkle_root": "b4c8cb5368bdd419ca721c6f8a13cee3e4a5e44754475ff13de245ca3c87202b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:38:52.921Z",
      "updated_at": "2026-10-25T03:48:50.516Z",
      "bitcoin_block_height": 973006,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add6bbd634319d630b7bc744eee9cda82ccf531648c6329498cece94358ae64275143ba66311ecbbfea4e67"
        },
        {
          "type": "bitcoin",
          "block_height": 973006,
          "merkle_root": "da84be31d94defc44b7c9891dcf4225e6e308647f1b0a99c304ad2bf1df7b40d"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T02:38:52.921Z",
      "updated_at": "2026-10-25T02:38:52.921Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add6bbdb5c7bbdc8a51918302af8f04d35b5c6f8e8bdbcdfa98c080a2e7fdce2a4bcf8d344d3cad1a9777b8"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/154/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."
}