{
  "height": 172,
  "block_hash": "c87c4d0a75e3b42c810957841882003da650c876ca1c6cdf888451365f2fd409",
  "status": "pending",
  "bitcoin_block_height": null,
  "digest": {
    "alg": "sha256",
    "hex": "c87c4d0a75e3b42c810957841882003da650c876ca1c6cdf888451365f2fd409",
    "preimage": "block:{\"at\":\"2026-10-25T04:04:21.319Z\",\"entry_count\":2,\"first_seq\":216,\"height\":172,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":217,\"merkle_root\":\"5afee8ab078508f29c57a3f5ac12c073c2a54c4b2b9e87a758f5612dadb7f0ca\",\"prev_hash\":\"dd368f805486942b89ef6c1f1d2af8c59bad3d5aa00ea966161bcc48142b8ae3\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "pending",
      "submitted_at": "2026-10-25T04:08:50.519Z",
      "updated_at": "2026-10-25T04:08:50.519Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add80d46a4162b7478c2bbbecff3016e4a3c03cce20937d2ec7394a59b44e99ab7c4321e8859fc0764d1640"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "pending",
      "submitted_at": "2026-10-25T04:08:50.519Z",
      "updated_at": "2026-10-25T04:08:50.519Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add80d3f5cc4aef31e774ac2e8fdc71d72815caaf383d34874408e05b4dc7a339242ef96f293d9fec63c8d3"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T04:08:50.519Z",
      "updated_at": "2026-10-25T04:08:50.519Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add80d47375d0f2fada7cb6ea2144f9ae2cfbede41e9750b61ac907631c37679419479d7e77b3b047df40db"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/172/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."
}