{
  "height": 20,
  "block_hash": "6080e68206301c750044f731de8b7e98a9019d068377f042323658812b1572ca",
  "status": "confirmed",
  "bitcoin_block_height": 972852,
  "digest": {
    "alg": "sha256",
    "hex": "6080e68206301c750044f731de8b7e98a9019d068377f042323658812b1572ca",
    "preimage": "block:{\"at\":\"2026-10-24T00:10:59.914Z\",\"entry_count\":1,\"first_seq\":22,\"height\":20,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":22,\"merkle_root\":\"bdd1ada8a7f048b9002ca60f75b4359a78aefe5d2805c3d9906fa1fc088f3b70\",\"prev_hash\":\"2f5bc16b42c13d99cf69ae592b7a817c1bf38a2e9af71fff9f558fad1e7a21e1\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T00:17:59.826Z",
      "updated_at": "2026-10-24T02:17:59.840Z",
      "bitcoin_block_height": 972852,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adbf93895fa6c016a48de198e074aa15006c4c705e104c08569677ee60ae5496c13a028b6e51428e292935a"
        },
        {
          "type": "bitcoin",
          "block_height": 972852,
          "merkle_root": "c8a684f5814e05d6118ada0f38a8d440450ea1f611912c618a99c81dff39d394"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T00:17:59.826Z",
      "updated_at": "2026-10-24T02:17:59.840Z",
      "bitcoin_block_height": 972852,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adbf9386e77fe38e5edffe1aca9bc0c871f9b5118cddeeed7c7ca9f6d799231559d131d6a1716ce083ea0bc"
        },
        {
          "type": "bitcoin",
          "block_height": 972852,
          "merkle_root": "c8a684f5814e05d6118ada0f38a8d440450ea1f611912c618a99c81dff39d394"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T00:17:59.826Z",
      "updated_at": "2026-10-24T04:53:42.413Z",
      "bitcoin_block_height": 972871,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adbf938e9a7dc303021d481f762ac0bbcb7a5f34fe051b8b1e866b583a99fb0b435e3b301d3c108751ca9bd"
        },
        {
          "type": "bitcoin",
          "block_height": 972871,
          "merkle_root": "96023e29396199d7f998b73198fe082536fa2b29b84bd1f8307762231f94e59d"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/20/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."
}