{
  "height": 15,
  "block_hash": "08975b51d6d5dd0907918c04a7a3006b301a5ec258ad60fa7b5ef461963c569d",
  "status": "confirmed",
  "bitcoin_block_height": 972551,
  "digest": {
    "alg": "sha256",
    "hex": "08975b51d6d5dd0907918c04a7a3006b301a5ec258ad60fa7b5ef461963c569d",
    "preimage": "block:{\"at\":\"2026-10-22T00:10:49.916Z\",\"entry_count\":1,\"first_seq\":17,\"height\":15,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":17,\"merkle_root\":\"431a6e84c629b0998b047bdb920140135e493e7d5c7adfc1ce72ea3901767582\",\"prev_hash\":\"9b52bcd6a4cc336eee737309332640a503f0e4cbc59b4a1e1c09ea8d39f33270\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-22T00:12:40.267Z",
      "updated_at": "2026-10-22T03:12:40.300Z",
      "bitcoin_block_height": 972551,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6ad954f9593a9ac8a0d14ab726cda51db7551ea4aba88376ed6afd4caeba373513a0f760450f8be83910c3cd"
        },
        {
          "type": "bitcoin",
          "block_height": 972551,
          "merkle_root": "2b2fcae87951cfbb27a5fea58f9e9743aeecee7aa5a548d45b3e90004f720a83"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-22T00:12:40.267Z",
      "updated_at": "2026-10-22T03:12:40.300Z",
      "bitcoin_block_height": 972552,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6ad954f82d56ecbde00b49ac6176717e0bf56c31fb2368ecc67aa058fc1a5d8d042b25a6a72addee2a374051"
        },
        {
          "type": "bitcoin",
          "block_height": 972552,
          "merkle_root": "49ce3c75f476e2fe0d404aeb52c3b199a241c749671672da316791e0e2b82d82"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-22T00:12:40.267Z",
      "updated_at": "2026-10-22T03:12:40.300Z",
      "bitcoin_block_height": 972552,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6ad954f998320b9c3ca9fa1dfa789133f98d3341e3ad99499416af15ca3da6d5058129d4cc0432bd5c9aaba6"
        },
        {
          "type": "bitcoin",
          "block_height": 972552,
          "merkle_root": "49ce3c75f476e2fe0d404aeb52c3b199a241c749671672da316791e0e2b82d82"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/15/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."
}