{
  "height": 164,
  "block_hash": "60d4f4c71de4cc208b707cbe56fd02d0574440668fa319a56685ce0334e6b895",
  "status": "confirmed",
  "bitcoin_block_height": 973010,
  "digest": {
    "alg": "sha256",
    "hex": "60d4f4c71de4cc208b707cbe56fd02d0574440668fa319a56685ce0334e6b895",
    "preimage": "block:{\"at\":\"2026-10-25T03:24:35.543Z\",\"entry_count\":2,\"first_seq\":200,\"height\":164,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":201,\"merkle_root\":\"2395d810a93771fe1d497b94e7f2b522a2ad7b22aa3f31d7d3bc9937344df0ff\",\"prev_hash\":\"d7b2b560076bea4ef1919902166699ef68a4f90eb83d8cc22cf918589c11b8d4\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T03:28:50.512Z",
      "updated_at": "2026-10-25T04:28:50.521Z",
      "bitcoin_block_height": 973010,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add77747aaa40be8901773df95f1f654bb64ec61de854f31c0380081b38114f4d5a04c5d7dcb9dab71d3316"
        },
        {
          "type": "bitcoin",
          "block_height": 973010,
          "merkle_root": "dc04a7fb9aea89a51c41e84f6a61d3a360a4067d8910d5945ceb0b4d85cd2229"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T03:28:50.512Z",
      "updated_at": "2026-10-25T04:28:50.521Z",
      "bitcoin_block_height": 973010,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add777366dceeb14681d18422f86876797c745aed17f208cc0ec0f615825042fedd4f15d0ad1013933f1db4"
        },
        {
          "type": "bitcoin",
          "block_height": 973010,
          "merkle_root": "dc04a7fb9aea89a51c41e84f6a61d3a360a4067d8910d5945ceb0b4d85cd2229"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T03:28:50.512Z",
      "updated_at": "2026-10-25T03:28:50.512Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add777300d9c3a6e78a42e1826ea4ca885911d72c7bb3e67d433abcc9577150e54af8e8fec78f05521250aa"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/164/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."
}