{
  "height": 140,
  "block_hash": "858b0e93487d649ad17894e8c84e502cfb72abb498a9fb4089d06e88855fb6b7",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "858b0e93487d649ad17894e8c84e502cfb72abb498a9fb4089d06e88855fb6b7",
    "preimage": "block:{\"at\":\"2026-10-25T01:16:18.343Z\",\"entry_count\":2,\"first_seq\":151,\"height\":140,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":152,\"merkle_root\":\"585ada505347bcd425b10960fea1945873771767f7148b40e3aaab485920cf64\",\"prev_hash\":\"b638309b5396104b73eeffad89fca54d83e9d03409135c70b0fc497b0130e76f\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:20:47.443Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add5971c71134f86922907fb07c0ab3123ba46a32af6e3e2c05e37a99f4643866ef5846e1352b175bb78de3"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:20:47.443Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add59704c2c87f27c4c3b48445a42a830a4426ff772d54e91d02ed2d024390f595234c171176aec91786c2e"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:20:47.443Z",
      "updated_at": "2026-10-25T01:20:47.443Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add5970d8cbe890228ae5fb62aa35c3bbb0e239641c5487e429dcb97f1b34b0d206908344956b5ee805bb3d"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/140/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."
}