{
  "height": 44,
  "block_hash": "cb3d3b2efab97a38f9a932969861803e4f00e5e03031e76590fa32eea78410fa",
  "status": "confirmed",
  "bitcoin_block_height": 972955,
  "digest": {
    "alg": "sha256",
    "hex": "cb3d3b2efab97a38f9a932969861803e4f00e5e03031e76590fa32eea78410fa",
    "preimage": "block:{\"at\":\"2026-10-24T17:10:31.650Z\",\"entry_count\":1,\"first_seq\":46,\"height\":44,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":46,\"merkle_root\":\"630eb15c03d4dd26022401f9563c1e3455981615c924f56e446c07baf3c1471a\",\"prev_hash\":\"e02ba03d8c780817ef6cee7e97c44ab4eee3bfdbf1c0b3f97d1c2876fb89a733\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:11:01.670Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adce6a758f3c3dd4f43767172f311e55a48097e330ef52b909acec3ef61b93745f8bc2de1dd8cb6a31ff06d"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:11:01.670Z",
      "updated_at": "2026-10-24T18:43:36.793Z",
      "bitcoin_block_height": 972955,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adce6a65aeb811ec54fb3214491768b73bcc672f826a2087765686f93e04ca134770902140aff8bc8552bbf"
        },
        {
          "type": "bitcoin",
          "block_height": 972955,
          "merkle_root": "3070b4b64d766acc6b8c2ec362acc3415aa2e07e9a5bc2e992ccd9c676ae577b"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:11:01.670Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adce6a6847f512ae8b5c84f74b4fbad0ff650e5121fbb3016e133ccd018b92886ae071a0f72f13957e31e75"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/44/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."
}