{
  "height": 144,
  "block_hash": "0b34f4c99d591f16ced6497989e27f2e86c9476df2283aeaf93779c1a8752c55",
  "status": "confirmed",
  "bitcoin_block_height": 973001,
  "digest": {
    "alg": "sha256",
    "hex": "0b34f4c99d591f16ced6497989e27f2e86c9476df2283aeaf93779c1a8752c55",
    "preimage": "block:{\"at\":\"2026-10-25T01:36:18.827Z\",\"entry_count\":2,\"first_seq\":159,\"height\":144,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":160,\"merkle_root\":\"6076f17591b316ea9834a13ca20b76d8ad6620238d209fe00e0a11c5b009da6b\",\"prev_hash\":\"ae36c2e410730badd0671ae78f5cb81f2f2e5f5a9a24981f488d0b247073aa8a\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:39:22.930Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add5dcc7ddaa968357939fda2cd5a6a7da2379f91bde7f20f1f60e072c3d076a74268ea37bf9513a99c4268"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T01:39:22.930Z",
      "updated_at": "2026-10-25T03:13:01.807Z",
      "bitcoin_block_height": 973001,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add5dccc4a3b4eaf49c7b3e0e74612fc4b9ccc635c7a9d64de084055c179fe72fb44bf266ba91fe48fad6d7"
        },
        {
          "type": "bitcoin",
          "block_height": 973001,
          "merkle_root": "7523ceb63fadcaf8408d48fb7985b756a5380aa791b1c4b4c0859bc661126d19"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-10-25T01:39:22.930Z",
      "updated_at": "2026-10-25T01:39:22.930Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add5dcdc7b765e326a02bf63a004e66a6bffd380c95f4b4004ab9e3571ab41e19e352d1ee3413f727ea7c70"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/144/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."
}