{
  "height": 61,
  "block_hash": "d4e278b8b5b07468a5fda5ada17ed0c9bc9c9de1547cd7b672e424c6860695f3",
  "status": "confirmed",
  "bitcoin_block_height": 972968,
  "digest": {
    "alg": "sha256",
    "hex": "d4e278b8b5b07468a5fda5ada17ed0c9bc9c9de1547cd7b672e424c6860695f3",
    "preimage": "block:{\"at\":\"2026-10-24T18:36:02.832Z\",\"entry_count\":1,\"first_seq\":63,\"height\":61,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":63,\"merkle_root\":\"0b37745494fe028678d70bfd5062c20ad06a8dd31aeea6c9e693157f151a4e8e\",\"prev_hash\":\"1a5f5c4db5287fbbd07ded0e0a2d789f13a0971af5ee9ac0c6b2ce8345c33fc0\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:40:31.672Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6adcfba1289192dd4a0b7c647dd80f730612eee0dcb788dac34846142ae30bfa7faeecf778a974df8ff8c167"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:40:31.672Z",
      "updated_at": "2026-10-24T21:37:52.447Z",
      "bitcoin_block_height": 972968,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6adcfba0efd2212a3fe2e34f0f43ce0c957d24cdd164f1b06f5b26390996915d0191e6e82659da7950646fa3"
        },
        {
          "type": "bitcoin",
          "block_height": 972968,
          "merkle_root": "2a0afd342bd007efb1fc07905f9b010bb0dbfc7c9b9c619cb1902d45b6d9cff3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-24T18:40:31.672Z",
      "updated_at": "2026-10-25T02:49:17.524Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6adcfba1ceb6fc47f9aa12e9c9b5594e5da19a57c2e76572b266fc3326ebb47f12845bf4153732026aa6a87e"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/61/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."
}