{
  "height": 50,
  "block_hash": "48fb5abcf981eade97bf7e03b59d95f434a9fd4fc40023d231b5befe1d29c9f5",
  "status": "confirmed",
  "bitcoin_block_height": 972956,
  "digest": {
    "alg": "sha256",
    "hex": "48fb5abcf981eade97bf7e03b59d95f434a9fd4fc40023d231b5befe1d29c9f5",
    "preimage": "block:{\"at\":\"2026-10-24T17:41:01.955Z\",\"entry_count\":1,\"first_seq\":52,\"height\":50,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":52,\"merkle_root\":\"89949697392acbd9c0894eafc95f293011643bf035c6b2bb70b5504933e54846\",\"prev_hash\":\"b13e4c46d032e2c38e0757b03b4a397a73ae6d556cacf30852327e55a27b1e0b\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:50:31.660Z",
      "updated_at": "2026-10-24T18:53:06.796Z",
      "bitcoin_block_height": 972956,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcefe8d78b5865685f1656f6c4151592b28f5548f673c5adf67b017e209a439583f73cebe33ef2b70a7bd4"
        },
        {
          "type": "bitcoin",
          "block_height": 972956,
          "merkle_root": "4071a7ab56c5818aef15079b96bb02eab8d1937111f6627e87c13f5ba0e6add9"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:50:31.660Z",
      "updated_at": "2026-10-24T18:53:06.796Z",
      "bitcoin_block_height": 972956,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcefe8fc9f303b4da926fa8e7c951dd49da90461ee06b6461715ed2eef4ba0baa82d2e475b477c48d8e96e"
        },
        {
          "type": "bitcoin",
          "block_height": 972956,
          "merkle_root": "4071a7ab56c5818aef15079b96bb02eab8d1937111f6627e87c13f5ba0e6add9"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T17:50:31.660Z",
      "updated_at": "2026-10-24T18:53:06.796Z",
      "bitcoin_block_height": 972959,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcefe86fbaed7c3f91069ce3b3db967e6d3037765e372067b15eaf87ce069cbe943a92d0faa8fb5a4daac9"
        },
        {
          "type": "bitcoin",
          "block_height": 972959,
          "merkle_root": "b24f80d7cd4c29a7c0218013b1bbb0a729ae2ef53b720f465ca9c5b104743f66"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/50/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."
}