Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd56a-03c2-748b-b9f3-e4389fe09daa
Capture Method: Polling
Captured At: Aug 6, 2026, 4:52 AM UTC

Everything Truestamp records about this entropy observation, as a single canonical JSON object.

{
  "block_id": "019fd56a-e453-7b8b-92f2-c4eb5a6ca202",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "23BDD1E01B6F593BDF7E6FDAED8B51306AF677B54F71C060ED7480C4E3ABDF504F0A1DC5BA00C49FB2A07A9F895CFF3974046937848C0CB597390961B7BBA88F",
      "pulseIndex": 1891759,
      "timeStamp": "2026-08-06T04:48:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "a107bded06d196efe70a5cc09d24eb64bebdc852933e41cd30f8d6a37ddaaf4a",
  "id": "019fd56a-03c2-748b-b9f3-e4389fe09daa",
  "inserted_at": "2026-08-06T04:52:02.626321Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "007d899d8c4e02d8ac9bf802359c73a7187dd437332fb1bd3b08e4ee1a7a20ba",
  "signature": "t0GGE0m/QUroAu5CYtoEvekbvTf38HTzGSu2FjwxuI2EPh5Qf9393UD/TTKUGfLNwP3Nx5qHWfiLkUIqb49tDw==",
  "signing_key_id": "3c19f776",
  "source": "entropy_nist",
  "state": "committed"
}

Observation

Verifiable entropy captured from an external public source. The canonical JSON representation and its hash are used as input to the blockchain's Merkle tree.

Entropy Canonical Pretty

{"pulse":{"chainIndex":2,"outputValue":"23BDD1E01B6F593BDF7E6FDAED8B51306AF677B54F71C060ED7480C4E3ABDF504F0A1DC5BA00C49FB2A07A9F895CFF3974046937848C0CB597390961B7BBA88F","pulseIndex":1891759,"timeStamp":"2026-08-06T04:48:00.000Z","version":"2.0"}}

Entropy Hash

a107bded06d196efe70a5cc09d24eb64bebdc852933e41cd30f8d6a37ddaaf4a

Observation Hash

007d899d8c4e02d8ac9bf802359c73a7187dd437332fb1bd3b08e4ee1a7a20ba

SHA-256 composite hash binding the entropy data, metadata, and signing key id. This is the value placed as a leaf in the block's Merkle tree, and the value covered by the signature below.

Observation ID: 019fd56a-03c2-748b-b9f3-e4389fe09daa

Time Delta

NIST Beacon pulses include a timestamp representing when the pulse was generated. Pulses are generated every 60 seconds, and the beacon releases each one a few minutes after that timestamp, so a delta of several minutes is normal. A much larger delta means the value was already old when we captured it, which pins a submission window less tightly but does not make the observation any less valid.

NIST Beacon Pulse Time

Aug 6, 2026, 4:48 AM UTC

Timestamp in NIST pulse 1891759

Truestamp Capture Time

Aug 6, 2026, 4:52 AM UTC

Periodic capture via HTTP polling

Time Difference (Clock Delta)

4 minutes

Source timestamp was 4 minutes behind capture time

Interpretation: The interval between the time the source published this value and the time we captured it. This one is under 1 hour.

Signature Verification

Truestamp signed this observation's hash at capture. Verify the signature in any Ed25519 verifier using the observation hash, public key, and signature shown below. The active public key is also published at https://www.truestamp.com/.well-known/keyring.json.

Algorithm

Ed25519

Message (Observation Hash, Hex encoded)

007d899d8c4e02d8ac9bf802359c73a7187dd437332fb1bd3b08e4ee1a7a20ba

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

t0GGE0m/QUroAu5CYtoEvekbvTf38HTzGSu2FjwxuI2EPh5Qf9393UD/TTKUGfLNwP3Nx5qHWfiLkUIqb49tDw==

Verify Signature Manually

Opens an external Ed25519 verification tool with all fields pre-filled.