{
  "height": 131,
  "block_hash": "d24c29256e47c69b6d0d51ea1f29c9db7c9d046836f6efa131fecf62396cffb7",
  "status": "confirmed",
  "bitcoin_block_height": 972999,
  "digest": {
    "alg": "sha256",
    "hex": "d24c29256e47c69b6d0d51ea1f29c9db7c9d046836f6efa131fecf62396cffb7",
    "preimage": "block:{\"at\":\"2026-10-25T00:29:07.225Z\",\"entry_count\":1,\"first_seq\":134,\"height\":131,\"key_id\":\"key_41eb7b6d1b11968a\",\"last_seq\":134,\"merkle_root\":\"e6852f93159a23260b568f9c68382630a2c3898ed1cc1d5caf5fc0c8dcc2af3a\",\"prev_hash\":\"96c779e2af75e8bb09ef2b62607679da0df925c729d856cb261ad9e26dc9671b\",\"v\":1}"
  },
  "calendars": [
    {
      "calendar": "https://a.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:31:17.450Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://alice.btc.calendar.opentimestamps.org",
          "commitment": "6add4dd74e84c5bedaacc3fc65c3fbffa578c2ed811f4c72c740d26afb67395b4a9c73d934967bb9bd4e51a7"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    },
    {
      "calendar": "https://b.pool.opentimestamps.org",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:31:17.450Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://bob.btc.calendar.opentimestamps.org",
          "commitment": "6add4dd6b73f1a3d69f235de3388e23c5ef81b6327a208cc6427dcebc241b8e1282c26499b56fdf99d22240d"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    },
    {
      "calendar": "https://finney.calendar.eternitywall.com",
      "status": "confirmed",
      "submitted_at": "2026-10-25T00:31:17.450Z",
      "updated_at": "2026-10-25T02:39:47.523Z",
      "bitcoin_block_height": 972999,
      "attestations": [
        {
          "type": "pending",
          "uri": "https://finney.calendar.eternitywall.com",
          "commitment": "6add4dd834659b50b891989005a2694ad70aa4dd3e0f9e4281ddb28e8622ea6130df7f185cf0ececf02ac573"
        },
        {
          "type": "bitcoin",
          "block_height": 972999,
          "merkle_root": "ae0e717f0d642956016a8572888d23fb045efcac654b542c5ac908707f3b5590"
        }
      ]
    }
  ],
  "proof_url": "https://www.rightshold.com/v1/ledger/blocks/131/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."
}