{
  "height": 153,
  "block_hash": "d61fc7728f7ba584f7b3121ff4f6cad4170746e2dad95b81177d3d2d0d5a4fb1",
  "status": "confirmed",
  "bitcoin_block_height": 973005,
  "digest": {
    "alg": "sha256",
    "hex": "d61fc7728f7ba584f7b3121ff4f6cad4170746e2dad95b81177d3d2d0d5a4fb1",
    "preimage": "block:{\"at\":\"2026-10-25T02:24:23.622Z\",\"entry_count\":2,\"first_seq\":177,\"height\":153,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":178,\"merkle_root\":\"5356944e575dc9c9d14be9ddb390b796af40688fef0abe988eb295615700691e\",\"prev_hash\":\"b30c16bcbb19f3a4c56dd5604d3577ea4d4921067a1a3cc256c3cde05fe6c97a\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:28:52.921Z",
      "updated_at": "2026-10-25T04:38:50.522Z",
      "bitcoin_block_height": 973005,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add696771c571303ae0f1ca09dfc7b046a50388980c48c0e7747ca4dea0467c3203a3d147fa811e723e1396"
        },
        {
          "type": "bitcoin",
          "block_height": 973005,
          "merkle_root": "cc85efef5df8fdca5c847d30ae06884a21a18bddeb1fc8c0fe7e92c7fab5b740"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T02:28:52.921Z",
      "updated_at": "2026-10-25T04:38:50.522Z",
      "bitcoin_block_height": 973005,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add6966287ead47a576f443f9c6d4a54cd936cbdc2a8f9e38e8bb595dfbfcba0c0d493322cfdeeb9ab02fb4"
        },
        {
          "type": "bitcoin",
          "block_height": 973005,
          "merkle_root": "cc85efef5df8fdca5c847d30ae06884a21a18bddeb1fc8c0fe7e92c7fab5b740"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T02:28:52.921Z",
      "updated_at": "2026-10-25T02:28:52.921Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add69663eb6024b2df0d48d04e0946c4142023a87c559dbeafd5886ea0346c6d1f87f7e10d3ae516fb33ebd"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/153/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."
}