{
  "height": 145,
  "block_hash": "893a4cbbcdbcc19751b463c22a887b5f2ef55fc06e5716974022b5d693b48064",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "893a4cbbcdbcc19751b463c22a887b5f2ef55fc06e5716974022b5d693b48064",
    "preimage": "block:{\"at\":\"2026-10-25T01:44:23.094Z\",\"entry_count\":2,\"first_seq\":161,\"height\":145,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":162,\"merkle_root\":\"28a51bbd204e95e377e6a7c340493b1b0b0edec493e237b25fad1bf959a3ad64\",\"prev_hash\":\"0b34f4c99d591f16ced6497989e27f2e86c9476df2283aeaf93779c1a8752c55\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:48:52.916Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add600550d98d04c1629e14e0e03df447887d172cb67abedfea590e03e1cd7b24763d56464c392d8480c554"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:48:52.916Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add60051a80ddbd6b5da0809163917865cfea2b3f3e74117cdaadbadab397bf0857efff545697554b96698b"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:48:52.916Z",
      "updated_at": "2026-10-25T01:48:52.916Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add60063757a03f0879d35578f173d7aa0d2dd0814f76e0c9edc83ce419d4d7cc65fed8746c1f8861422714"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/145/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."
}