{
  "height": 109,
  "block_hash": "d353319861c8aa273acbd045cdffc1e1d3b21c811e34be9005fab3f020cd322b",
  "status": "confirmed",
  "bitcoin_block_height": 972988,
  "digest": {
    "alg": "sha256",
    "hex": "d353319861c8aa273acbd045cdffc1e1d3b21c811e34be9005fab3f020cd322b",
    "preimage": "block:{\"at\":\"2026-10-24T22:43:52.687Z\",\"entry_count\":1,\"first_seq\":112,\"height\":109,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":112,\"merkle_root\":\"32608e12e765ec14f5d8846e2ee1817bf29e3e728c4490b02b0063672f41dd46\",\"prev_hash\":\"0b0b98e4ff92398d2ca5fce64cb3f933f02ac512f79b4cf898966f0c4e47e070\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:48:07.664Z",
      "updated_at": "2026-10-25T00:31:17.450Z",
      "bitcoin_block_height": 972988,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add35a81f088ac202750cd17c32e36f675a96b08fef0ac733d213620ab7e250ac2bfc5a193bc1267cbdaebf"
        },
        {
          "type": "bitcoin",
          "block_height": 972988,
          "merkle_root": "3c587ddc5f28b4732a5eeb27216e13677e4348754375484a771cd576c6e70198"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:48:07.664Z",
      "updated_at": "2026-10-25T00:31:17.450Z",
      "bitcoin_block_height": 972988,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add35a74d14a437065e6fdbf6493f3fc3e2e51c484dc89196d2070707239603730dc8d45e8ac6531659525e"
        },
        {
          "type": "bitcoin",
          "block_height": 972988,
          "merkle_root": "3c587ddc5f28b4732a5eeb27216e13677e4348754375484a771cd576c6e70198"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T22:48:07.664Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add35a8424ea740ceff59db260096db7b1dff86bb42f6f8cef2ecb7ed124e1410f61b7540a6bfae62d745f7"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/109/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."
}