{
  "height": 103,
  "block_hash": "be9b6546f6e1708103e3e509b5c16c84a45ca6ad801c4dad627220387b1baad3",
  "status": "confirmed",
  "bitcoin_block_height": 974888,
  "digest": {
    "alg": "sha256",
    "hex": "be9b6546f6e1708103e3e509b5c16c84a45ca6ad801c4dad627220387b1baad3",
    "preimage": "block:{\"at\":\"2026-11-07T03:19:15.429Z\",\"entry_count\":2,\"first_seq\":213,\"height\":103,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":214,\"merkle_root\":\"d147b886f50fe55180fb7195bcb752e955e52463c8910357a260423e7b3e1a10\",\"prev_hash\":\"d2d1c3ade70611e3d1064bc4fe425d803d6571633d137bcb1cf87a508f6e2832\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:28:43.476Z",
      "updated_at": "2026-11-07T05:28:43.487Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee9aecffc524b06f73f1b0fe7c19e67788edb785bb741e8c03c87bfa61918a55a8162fc6ddd72197f4bc5a"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T03:28:43.476Z",
      "updated_at": "2026-11-07T05:28:43.487Z",
      "bitcoin_block_height": 974888,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee9aec120398988b55b868a33382dabcaf5662997207b8a3e1cb525c5fd0aa470420a90d040b311b6fe1da"
        },
        {
          "type": "bitcoin",
          "block_height": 974888,
          "merkle_root": "a373ea77dcacd26df989734c2bed34895920c60a915ed91eb73aa06c53238081"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "pending",
      "submitted_at": "2026-11-07T03:28:43.476Z",
      "updated_at": "2026-11-07T03:28:43.476Z",
      "bitcoin_block_height": null,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee9aecd64b6efbcfe60be8c1140b210cafe07154701d443049092481336c500061c00a6a6275ea6f35b3a9"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/103/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."
}