{
  "height": 135,
  "block_hash": "033d651090a715621a5941b2699fcf987915b917226e94c02fbef20775b0dc88",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "033d651090a715621a5941b2699fcf987915b917226e94c02fbef20775b0dc88",
    "preimage": "block:{\"at\":\"2026-10-25T00:51:17.887Z\",\"entry_count\":2,\"first_seq\":141,\"height\":135,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":142,\"merkle_root\":\"b80836d05145a2a840f63432f0c3db897377eaa04618e65f0485f85d0d8e41b6\",\"prev_hash\":\"fbec153acc8e2bf944c8593851f9a56661e41027a9756b085830ccba68380814\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:00:47.439Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add54c1d61e6aa667801b9268798a853b9eda1ae085cd6c0b5dc39cb04f0d0cac947859c899d1d2bdb329ec"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:00:47.439Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add54c040cdfe08742ec9764fc70e9116371ac9f4c4196a3ecfe7c9e1bd282ece5da607c24d1fcebbb14e74"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:00:47.439Z",
      "updated_at": "2026-10-25T01:00:47.439Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add54c0a274d5fb1a3dad30217b332e9e153167c174483634bb2b34e73301178f8e3d5703b327a95822ed2f"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/135/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."
}