{
  "height": 124,
  "block_hash": "a6f8eea00ae158e7759a2d3c4358fcadeac9ef62138db4318b783ef1e974de20",
  "status": "confirmed",
  "bitcoin_block_height": 972999,
  "digest": {
    "alg": "sha256",
    "hex": "a6f8eea00ae158e7759a2d3c4358fcadeac9ef62138db4318b783ef1e974de20",
    "preimage": "block:{\"at\":\"2026-10-24T23:59:07.005Z\",\"entry_count\":1,\"first_seq\":127,\"height\":124,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":127,\"merkle_root\":\"f3af476dfc4be52189a2b3d2d947b9a0e289e0c374b0c213a442b6303252a5c3\",\"prev_hash\":\"5458aaa69428cee27ad363babc2d017c9591c35bb78a718bed4a2431597992a4\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:03:36.869Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add475a64649caa6d26b78099abfdaa5e1aa2e3c0f2a4ec51244f71710ee14d86b15cc454631f4a7a8d06dd"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:03:36.869Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add475ad3f7cae07fb8e7f909a6c89ddbb20453ee40c9de47cb97530243ea55e657457965414beb5ed8bf36"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:03:36.869Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add475aa43cdbfa723602ca89d30034e3380572752515dd3e309d661230dcf05f81aa94fa3bbc8e39c6af00"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/124/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."
}