{
  "height": 9,
  "block_hash": "3d86699e5c6c5b61717d6527a8c8a39940ab5f8d8280ea0013d468ebb1836506",
  "status": "confirmed",
  "bitcoin_block_height": 972073,
  "digest": {
    "alg": "sha256",
    "hex": "3d86699e5c6c5b61717d6527a8c8a39940ab5f8d8280ea0013d468ebb1836506",
    "preimage": "block:{\"at\":\"2026-10-18T23:08:49.440Z\",\"entry_count\":1,\"first_seq\":11,\"height\":9,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":11,\"merkle_root\":\"07f373c949a7028497a74634fb75fe30f008ca02e1267b693b6085b36072ddeb\",\"prev_hash\":\"bb1103527a886abc7de61c19e510ad495ff86ebb55f5b675ac360b4cb641783c\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-18T23:09:19.445Z",
      "updated_at": "2026-10-19T00:18:49.461Z",
      "bitcoin_block_height": 972073,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6ad5519f5cedb808a8233269fe44ec19d5b87ea36d3e071b95fef254c6b252ccdf742b6bac63e384e5ece0d8"
        },
        {
          "type": "bitcoin",
          "block_height": 972073,
          "merkle_root": "c84aaa78bf920e3f85a2c4a6bf047d91452db582218d2c37300b91f82a058f32"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-18T23:09:19.445Z",
      "updated_at": "2026-10-19T00:18:49.461Z",
      "bitcoin_block_height": 972073,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6ad5519f05a8e25d9ce81486e64af17f4eac76c6e4d76ee78c0e5bfd2c8f039d2994b4c5d37b23d22223ce6a"
        },
        {
          "type": "bitcoin",
          "block_height": 972073,
          "merkle_root": "c84aaa78bf920e3f85a2c4a6bf047d91452db582218d2c37300b91f82a058f32"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-18T23:09:19.445Z",
      "updated_at": "2026-10-19T08:40:55.944Z",
      "bitcoin_block_height": 972115,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6ad551a0029887ea221b15cabbf7b592dc28f47da01bb7a50500a14cab65520ea4d07d5a582fd16665629889"
        },
        {
          "type": "bitcoin",
          "block_height": 972115,
          "merkle_root": "fc1f7a070be781a2e50ec075203c6a48dbd0e9a5d44737b1a86faf29ba8d3dee"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/9/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."
}