{
  "height": 110,
  "block_hash": "c53c92b1eefe68cea152f3871ddba140a09f8303e8830b08cf2682e826b10fe6",
  "status": "confirmed",
  "bitcoin_block_height": 972988,
  "digest": {
    "alg": "sha256",
    "hex": "c53c92b1eefe68cea152f3871ddba140a09f8303e8830b08cf2682e826b10fe6",
    "preimage": "block:{\"at\":\"2026-10-24T22:48:52.696Z\",\"entry_count\":1,\"first_seq\":113,\"height\":110,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":113,\"merkle_root\":\"d8f838ae8bfd601053eb1038d00c4a61618da79d9eab05f83fa0c9552205fa96\",\"prev_hash\":\"d353319861c8aa273acbd045cdffc1e1d3b21c811e34be9005fab3f020cd322b\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:58:07.672Z",
      "updated_at": "2026-10-25T00:03:36.869Z",
      "bitcoin_block_height": 972988,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add380090e7121de812f94c941c85c62e11707c5a58845e967bb8727a3863c16d8d07be83b289c751f1a93f"
        },
        {
          "type": "bitcoin",
          "block_height": 972988,
          "merkle_root": "3c587ddc5f28b4732a5eeb27216e13677e4348754375484a771cd576c6e70198"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:58:07.672Z",
      "updated_at": "2026-10-25T00:03:36.869Z",
      "bitcoin_block_height": 972988,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add3800ebd325894f4a14444ad4bad22a5bd35778ab6b3e15f3f6d255fb5a06942317bb0f3a34ee8a33e22f"
        },
        {
          "type": "bitcoin",
          "block_height": 972988,
          "merkle_root": "3c587ddc5f28b4732a5eeb27216e13677e4348754375484a771cd576c6e70198"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:58:07.672Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add3800adc4f2c0df20859bf9c068a0f89eaf4e7fdb5c9c6e01ddb893d5f8fc4f2683519010a64fc10cd753"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/110/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."
}