{
  "height": 118,
  "block_hash": "663d674a7620c19b2f68f2ba39f7fe35ff1aa16ce638e82568b21c3ed739788f",
  "status": "confirmed",
  "bitcoin_block_height": 972991,
  "digest": {
    "alg": "sha256",
    "hex": "663d674a7620c19b2f68f2ba39f7fe35ff1aa16ce638e82568b21c3ed739788f",
    "preimage": "block:{\"at\":\"2026-10-24T23:28:38.021Z\",\"entry_count\":1,\"first_seq\":121,\"height\":118,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":121,\"merkle_root\":\"c14d28eeb6b96de43abd05fdbc1d65f232f4174036c8a4d407a184550127034d\",\"prev_hash\":\"a678bb2523f37d303bb85d53055c3568c23e2eb76561c5f38648f47b7b7bbbd7\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:38:07.684Z",
      "updated_at": "2026-10-25T00:40:47.433Z",
      "bitcoin_block_height": 972991,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add4160d52a4c666d0037fa10d3aca60d97535fa4ee300b51857221f927f964531798493cc094c3ada64ac6"
        },
        {
          "type": "bitcoin",
          "block_height": 972991,
          "merkle_root": "cb9762fc6eb29834bde6a568d7a82b068c27508a16e6f1726aea4faddefd97f0"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:38:07.684Z",
      "updated_at": "2026-10-25T01:39:22.930Z",
      "bitcoin_block_height": 972992,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add4160a4d43af4eaa916af099b683d655f44a46714052a8c7c75e0fdb4a865e12e4e4bc5c813a05bb9ff47"
        },
        {
          "type": "bitcoin",
          "block_height": 972992,
          "merkle_root": "433ee89ea1ad5aa815ed2884b3befa05c425284f1598fbab3892d6139cc2c7ac"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:38:07.684Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add4160348e7aa96ea072814ddff30df5adcd20dd1f0130259ebd460bb9e1f94e133e359828912284f64815"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/118/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."
}