{
  "height": 10,
  "block_hash": "985fb5ef64ef3a52fde28495eaa8237a011a46fcace38c263131be4bb810279f",
  "status": "confirmed",
  "bitcoin_block_height": 972081,
  "digest": {
    "alg": "sha256",
    "hex": "985fb5ef64ef3a52fde28495eaa8237a011a46fcace38c263131be4bb810279f",
    "preimage": "block:{\"at\":\"2026-10-19T00:10:49.874Z\",\"entry_count\":1,\"first_seq\":12,\"height\":10,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":12,\"merkle_root\":\"9c6457f55f51ef62d95ca1060ed0e6a659b42dfbdbddecf632822e0fb0c1af6f\",\"prev_hash\":\"3d86699e5c6c5b61717d6527a8c8a39940ab5f8d8280ea0013d468ebb1836506\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-19T00:18:49.461Z",
      "updated_at": "2026-10-19T01:25:16.330Z",
      "bitcoin_block_height": 972081,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6ad561e951f28c69b23de7ff1e49759999b64ec9c1e9ba3049bc427c4c41c97158f9a64be351ae52f034ef89"
        },
        {
          "type": "bitcoin",
          "block_height": 972081,
          "merkle_root": "f956dc7847810c06ed40f100c4ad6f0ef0eef38d28f8a9b0d29b6408b24a06f2"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-19T00:18:49.461Z",
      "updated_at": "2026-10-19T01:25:16.330Z",
      "bitcoin_block_height": 972081,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6ad561e9b6d116b6e8f19accd35e35e4174dbc8bcca85fbf11a1ac47b2265f7e88fa36751ec15d46fd8f3751"
        },
        {
          "type": "bitcoin",
          "block_height": 972081,
          "merkle_root": "f956dc7847810c06ed40f100c4ad6f0ef0eef38d28f8a9b0d29b6408b24a06f2"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-19T00:18:49.461Z",
      "updated_at": "2026-10-19T08:40:55.944Z",
      "bitcoin_block_height": 972115,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6ad561ea11d9df3db0ca5767dcab8abeb2a791be2eebd112c83d45e47b0a3384f94926b3380f1014c38bb1cc"
        },
        {
          "type": "bitcoin",
          "block_height": 972115,
          "merkle_root": "fc1f7a070be781a2e50ec075203c6a48dbd0e9a5d44737b1a86faf29ba8d3dee"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/10/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."
}