{
  "height": 138,
  "block_hash": "10cf500f9ed2cc4af6d5bab02b10e8b5ebedbfaf61fa60910d8035915c8dc39c",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "10cf500f9ed2cc4af6d5bab02b10e8b5ebedbfaf61fa60910d8035915c8dc39c",
    "preimage": "block:{\"at\":\"2026-10-25T01:06:18.287Z\",\"entry_count\":2,\"first_seq\":147,\"height\":138,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":148,\"merkle_root\":\"c680378d6ff367e89724660da9f05b024d915d780eb5929fcb1b6dca32b4b46d\",\"prev_hash\":\"600330c4d6387a8e56e91f00104fba7fa77063047b8b48055bee33a21cb72449\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:10:47.440Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add57196fbce1aa4a276743187b8bc0b1a727c19201bd6586b612f961ffc8773255350ff1ba4c075dc54c26"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:10:47.440Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add5719f4e875244b3277c1a6a1fb899770143fc347c71dd14a0be3ba7213355c0c06361e3816f6c91da889"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:10:47.440Z",
      "updated_at": "2026-10-25T01:10:47.440Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add57197ad78195a743cf12b780018dcdbe2ac259cc839c7411cde7385c2c62fefe1b6133bde7bb75f33804"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/138/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."
}