{
  "height": 65,
  "block_hash": "e2d4b396f588b491b183ca35d23cf728995be76b33683ff739b1cf417e168ad4",
  "status": "confirmed",
  "bitcoin_block_height": 974877,
  "digest": {
    "alg": "sha256",
    "hex": "e2d4b396f588b491b183ca35d23cf728995be76b33683ff739b1cf417e168ad4",
    "preimage": "block:{\"at\":\"2026-11-07T01:47:15.174Z\",\"entry_count\":1,\"first_seq\":156,\"height\":65,\"key_id\":\"key_a521921c2ba20669\",\"last_seq\":156,\"merkle_root\":\"eb55c9b1e1a80e3b3f8f254d28a4bbd25a7ec32c3d5127cde4aeb62fba9de510\",\"prev_hash\":\"bf84ecc8b2fa59d6e6a09f563c4e890cb1458610527130f28a703e3d859bf63a\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:48:43.461Z",
      "updated_at": "2026-11-07T03:48:43.477Z",
      "bitcoin_block_height": 974880,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6aee837fabc686eaf985aa0f664b3a27bbdc39edaafc229e0c0ebdb7b8461f3c0c256f962c5d0a44df9e18cd"
        },
        {
          "type": "bitcoin",
          "block_height": 974880,
          "merkle_root": "e20917e92c25ba0bebbc60b5b7fe48f0ee84f05c3eb4987c3107d249f2c7113d"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:48:43.461Z",
      "updated_at": "2026-11-07T04:48:43.485Z",
      "bitcoin_block_height": 974883,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6aee8380c47b97c85589b5d05b920be6a8e99e60d79cc3412d554ed20c56cadd0798f45d3a22f777ef70a8af"
        },
        {
          "type": "bitcoin",
          "block_height": 974883,
          "merkle_root": "79abb9dd33baad0a1ff37045cc779f6fe1b133a7037999fbd2c996ad78e43b90"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-11-07T01:48:43.461Z",
      "updated_at": "2026-11-07T03:48:43.477Z",
      "bitcoin_block_height": 974877,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6aee8380fedf1bf0624109db8f1a5870448e287ad726798569c115f428b81f68989ce7a59ede8d97d469c517"
        },
        {
          "type": "bitcoin",
          "block_height": 974877,
          "merkle_root": "dee625f48434576e86df10e80f2912b1c31b96672232e47e103806c1faef5814"
        }
      ]
    }
  ],
  "proof_url": "https://www.a2ally.com/v1/ledger/blocks/65/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."
}