{
  "height": 121,
  "block_hash": "62ec63c701a7e9aff47984249450c2d2acbb857a405d67cfdd4ff3a842a60a21",
  "status": "confirmed",
  "bitcoin_block_height": 972992,
  "digest": {
    "alg": "sha256",
    "hex": "62ec63c701a7e9aff47984249450c2d2acbb857a405d67cfdd4ff3a842a60a21",
    "preimage": "block:{\"at\":\"2026-10-24T23:43:36.839Z\",\"entry_count\":1,\"first_seq\":124,\"height\":121,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":124,\"merkle_root\":\"e3486fae0b572240f0628106c2635e7a363c2e11f5b46bd42152407dc79b8c3d\",\"prev_hash\":\"f3755bdd7f5798bcc974a2426c6e1db0b3581e610ed02a7067826c3e235341a5\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:44:06.863Z",
      "updated_at": "2026-10-25T01:39:22.930Z",
      "bitcoin_block_height": 972992,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add42c91a4b701bdb74b633a58330c7cffcfe1afce59010091fc4819e51cfdcf766af3de1b3d6b3a8d1c516"
        },
        {
          "type": "bitcoin",
          "block_height": 972992,
          "merkle_root": "433ee89ea1ad5aa815ed2884b3befa05c425284f1598fbab3892d6139cc2c7ac"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:44:06.863Z",
      "updated_at": "2026-10-25T01:39:22.930Z",
      "bitcoin_block_height": 972993,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add42c8b314afb0a12832621ccec28aeed6b405c7741af0408b7e8acaa013129c2ca08fe72de21a1c3717e5"
        },
        {
          "type": "bitcoin",
          "block_height": 972993,
          "merkle_root": "38bdcfa6c75f0a225d7d4bec4e7744155441254baa8d040a293832c096def847"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T23:44:06.863Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add42c8ce4f3200a3a50919d085227f8764f590b602223d1bfb59562b8f63a32cea73691aab551784267771"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/121/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."
}