{
  "height": 8,
  "block_hash": "bb1103527a886abc7de61c19e510ad495ff86ebb55f5b675ac360b4cb641783c",
  "status": "confirmed",
  "bitcoin_block_height": 971922,
  "digest": {
    "alg": "sha256",
    "hex": "bb1103527a886abc7de61c19e510ad495ff86ebb55f5b675ac360b4cb641783c",
    "preimage": "block:{\"at\":\"2026-10-18T00:10:47.096Z\",\"entry_count\":1,\"first_seq\":10,\"height\":8,\"key_id\":\"key_f6a85f595bce8b9f\",\"last_seq\":10,\"merkle_root\":\"ce5f1b38f84b8ee9645543dec67eb033e8342995df29ed27a1dd16301bb734f9\",\"prev_hash\":\"9f6679f8acf17a15e33e1a3b5bb1ec7cd836738b14095de2fa91a812618e6608\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-18T00:18:16.917Z",
      "updated_at": "2026-10-18T01:18:16.929Z",
      "bitcoin_block_height": 971923,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6ad410497631c19918c73b8ec6c3429c79e6b22d00812f6888439aa87c8a3f60b22cf7735c051b84f96c3e58"
        },
        {
          "type": "bitcoin",
          "block_height": 971923,
          "merkle_root": "562d31a003047448fe3be2605f2fde355bd7e39e3e2fe7111abdee01d0260ed9"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-18T00:18:16.917Z",
      "updated_at": "2026-10-18T01:18:16.929Z",
      "bitcoin_block_height": 971922,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6ad410496d2bf2bdae0e807b6ede2ec01a10d63f611d1cd47a2e4fec6713fbf5b0bce109af9546fc4204c5ba"
        },
        {
          "type": "bitcoin",
          "block_height": 971922,
          "merkle_root": "29313bc965a28220b259439679834668efb09faef5068c555fdfd49578ced0c8"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-18T00:18:16.917Z",
      "updated_at": "2026-10-18T01:18:16.929Z",
      "bitcoin_block_height": 971922,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6ad410499b97a006568d1bc8090d6061b67d9464bff757b4919becb8bbb85c298c1ecefc8b9b8d31c39b1e06"
        },
        {
          "type": "bitcoin",
          "block_height": 971922,
          "merkle_root": "29313bc965a28220b259439679834668efb09faef5068c555fdfd49578ced0c8"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/8/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."
}