{
  "height": 26,
  "block_hash": "f6c324eaf543423e848ede20d0f08bab268832280edf10972c04b2afddc850f9",
  "status": "confirmed",
  "bitcoin_block_height": 972937,
  "digest": {
    "alg": "sha256",
    "hex": "f6c324eaf543423e848ede20d0f08bab268832280edf10972c04b2afddc850f9",
    "preimage": "block:{\"at\":\"2026-10-24T14:47:11.733Z\",\"entry_count\":1,\"first_seq\":28,\"height\":26,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":28,\"merkle_root\":\"eb69caa731fd052381cd4b93e83787c03280a064cbecdb83d498004a68412d9d\",\"prev_hash\":\"6f33705e4ca137b35d6788604b2c7f937dcb7130af2f0a6df1c5a64d72be0b69\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T14:57:11.217Z",
      "updated_at": "2026-10-24T16:03:14.735Z",
      "bitcoin_block_height": 972937,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcc747396fefd1776289ff6e1d4937014895990d4aeb8682b6bf07aefc624c20f34b73dd5170db05a0a3cf"
        },
        {
          "type": "bitcoin",
          "block_height": 972937,
          "merkle_root": "0323d18300e805a12930dd6f17c570277c88d3e25112bb7a505193a46248e1aa"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T15:30:27.789Z",
      "updated_at": "2026-10-24T16:57:12.873Z",
      "bitcoin_block_height": 972944,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adccf1406a3cb152f3e87db17c44c7df2b958b2d80526cf55cd691f6c025a877e9f92c74379ee85fea2d42e"
        },
        {
          "type": "bitcoin",
          "block_height": 972944,
          "merkle_root": "7cef4b3063deecf55c9f86b448194f888a3723e26d1e7aaa1ef6b349573d4656"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T14:57:11.217Z",
      "updated_at": "2026-10-24T19:53:06.806Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcc747e3d754b62e016f0fd37209dc2077d346b7079a8c1d56b9aeccf84a84f26b54a709379a3803728e3a"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/26/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."
}