{
  "height": 156,
  "block_hash": "ca3cfed9b1e5dd06a98b00e07bb84be5abb558eba1bcd566c9d5a77baca25a32",
  "status": "confirmed",
  "bitcoin_block_height": 973008,
  "digest": {
    "alg": "sha256",
    "hex": "ca3cfed9b1e5dd06a98b00e07bb84be5abb558eba1bcd566c9d5a77baca25a32",
    "preimage": "block:{\"at\":\"2026-10-25T02:39:17.516Z\",\"entry_count\":2,\"first_seq\":184,\"height\":156,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":185,\"merkle_root\":\"1d2ff180ee09e4c7f33c609caccd4546086ea761d2d008068db3218671de1fe6\",\"prev_hash\":\"b5d518a24b9aa2448a47c5c69688dc0e6e6923876cb8d8daa33f9ed22b54092d\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:39:47.523Z",
      "updated_at": "2026-10-25T04:40:53.358Z",
      "bitcoin_block_height": 973008,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add6bf4d7efe0e05d554353ca7adabf690dfcd93a034d393bf806980698d38f085bcfda4301c8addd30ab60"
        },
        {
          "type": "bitcoin",
          "block_height": 973008,
          "merkle_root": "b4c8cb5368bdd419ca721c6f8a13cee3e4a5e44754475ff13de245ca3c87202b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:39:47.523Z",
      "updated_at": "2026-10-25T04:40:53.358Z",
      "bitcoin_block_height": 973008,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add6bf3cb67d3255bac30d24a8fca226734af971c85e32e079fdbefe6d66f1bb242a839c8473d4002b4d531"
        },
        {
          "type": "bitcoin",
          "block_height": 973008,
          "merkle_root": "b4c8cb5368bdd419ca721c6f8a13cee3e4a5e44754475ff13de245ca3c87202b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T02:39:47.523Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add6bf48fd888ddb0bc231d92d33e319577e7cf2a40daa8e50fecec4b544ea973fd0b2762cf62f3ab9b835f"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/156/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."
}