{
  "height": 150,
  "block_hash": "7e17df07dbdfeb84453f089e1fabdc98c5eb2d06d2d2d00bea6f1436e6f4b72a",
  "status": "confirmed",
  "bitcoin_block_height": 973005,
  "digest": {
    "alg": "sha256",
    "hex": "7e17df07dbdfeb84453f089e1fabdc98c5eb2d06d2d2d00bea6f1436e6f4b72a",
    "preimage": "block:{\"at\":\"2026-10-25T02:09:23.580Z\",\"entry_count\":2,\"first_seq\":171,\"height\":150,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":172,\"merkle_root\":\"4a9f15c9139685658f3d15d7d0b8e0e1f99b902c217863ec5ab3818c11356c0f\",\"prev_hash\":\"32b1730a19c336a4c14382cbc7aacbb6d32df262fdb97d13aaa9b97e9d5679c3\",\"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": "6add670d43688ed188ec7be73ebe9be696cdd1e8e034303ad64eb6ba70a31d573936eecf8fafda1f3d5df685"
        },
        {
          "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": "6add670dd577b40effdb84f116147d732c049990926886274f24f54970e929476df80164d56360d3b8eb67fe"
        },
        {
          "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": "6add670e811a5b304b0cbc98b86e6d5beb490ab40d5c47e167b68cd82a6f4b802374ff3c08b8586adb5672c5"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/150/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."
}