{
  "height": 6,
  "block_hash": "b09777366d769ddf7f0d71f5ea79a7740d901a568ac83efb4536ab904dfa97dc",
  "status": "confirmed",
  "bitcoin_block_height": 971757,
  "digest": {
    "alg": "sha256",
    "hex": "b09777366d769ddf7f0d71f5ea79a7740d901a568ac83efb4536ab904dfa97dc",
    "preimage": "block:{\"at\":\"2026-10-16T18:54:45.673Z\",\"entry_count\":1,\"first_seq\":8,\"height\":6,\"key_id\":\"key_f6a85f595bce8b9f\",\"last_seq\":8,\"merkle_root\":\"00e7ad1126cf814992d51b4fc55ebc5e50620f9bab34f8f4c6423456ed937bc5\",\"prev_hash\":\"d2ac46ee75173fa00546dcc6901a86465b78ed5a1fe7fdc986095bb95b0b2b14\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-16T18:55:15.680Z",
      "updated_at": "2026-10-16T20:56:07.856Z",
      "bitcoin_block_height": 971757,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6ad27314252b24ba2e75d296c9f971b3ac36cbf9ba8a283ae1349cd9925fa5347e381f96a6b4756a48b4ebf3"
        },
        {
          "type": "bitcoin",
          "block_height": 971757,
          "merkle_root": "ce3b456aede8e77bbec9b5725786de94f3de4dacce78146c91e8b018327ac1ea"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-16T18:55:15.680Z",
      "updated_at": "2026-10-16T20:56:07.856Z",
      "bitcoin_block_height": 971757,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6ad2731470bc5852bce9ec40fa12cd25c55832bfaae6e004bb5b4a1a2d0fd6886d89a6793e57778b2044bfcf"
        },
        {
          "type": "bitcoin",
          "block_height": 971757,
          "merkle_root": "ce3b456aede8e77bbec9b5725786de94f3de4dacce78146c91e8b018327ac1ea"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-16T18:55:15.680Z",
      "updated_at": "2026-10-16T23:56:08.017Z",
      "bitcoin_block_height": 971775,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6ad27314f8fe7c710d3011630195bb0efb30def5026eb49bed78f2f7ea88955e70db469b768422d6f7b74502"
        },
        {
          "type": "bitcoin",
          "block_height": 971775,
          "merkle_root": "f036a41c4124f69a0195a34f9c61d69f25d3284789e1f26e434542ef41ac7b36"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/6/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."
}