{
  "height": 65,
  "block_hash": "1a97990412a884ef2c892bc00b304df269ba2512e423f54589423b81417cee96",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "1a97990412a884ef2c892bc00b304df269ba2512e423f54589423b81417cee96",
    "preimage": "block:{\"at\":\"2026-10-24T18:58:37.150Z\",\"entry_count\":1,\"first_seq\":67,\"height\":65,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":67,\"merkle_root\":\"7bad5b62c0ace777327bb2bd4136c5c892ffee68fabd7a74481259047ee8c1c7\",\"prev_hash\":\"6a0ff3f83ed9ad7ff1619cfba9b76f7aa6a85603883aaee370fe958b7a7640e7\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:03:06.797Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add00ecd9535f0b427f346e4c07f6c3421bf50504f779bf7c784db159be747589eb0378eaa8812675428b1a"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:03:06.797Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add00ecb7660ac9f445b60c2eb431df6be658a1fa63acbae69286099143f30b957f6adc083fd9e5b136b0c4"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T19:03:06.797Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add00edc49f1c200038037ca6eff49b112ea4532cf1bb806ec27aecdd4718d138f762d38aa8ba5fbee1e5c2"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/65/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."
}