{
  "height": 133,
  "block_hash": "971aa5402b9397c1e5d11083bd96235a93ad3018a91d5e69e00b2535b39ff212",
  "status": "confirmed",
  "bitcoin_block_height": 972999,
  "digest": {
    "alg": "sha256",
    "hex": "971aa5402b9397c1e5d11083bd96235a93ad3018a91d5e69e00b2535b39ff212",
    "preimage": "block:{\"at\":\"2026-10-25T00:41:17.828Z\",\"entry_count\":2,\"first_seq\":137,\"height\":133,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":138,\"merkle_root\":\"64a25e525946218956ef556193198c61501e7766e8509f1736838e596f9131bc\",\"prev_hash\":\"ae33ad81bcca41dec5903c478f18b7b934049064417bf9e4f0011b2a26e96f59\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:50:47.436Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add526819f2663e5a81021adb69b49e271a98f87c31952ab15ac05e2f2ab486c3be867261518e08af09a992"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:50:47.436Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add52682d92fdaf3a64fadf4594f40c55e8bc325287047aec7760b9f79846825fb34b63fa8b398f6ae07d07"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:50:47.436Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add5268d1282820cf7e2ccb9cd705724f79932e5e21dd033e37c37fd3570f563a1e157cee28e17dc6b0a760"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/133/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."
}