Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd1ed-6762-7f40-b5e8-ca8eba210079
Capture Method: Polling
Captured At: Aug 5, 2026, 12:37 PM UTC

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

{
  "block_id": "019fd1ee-40d1-7160-8ef9-a94ebfd0ce3d",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "679A6E7BD000335E8478270E0D2C0438CEBD4269E25874448E0E599E3FCC6811291172FF9AD7CE1D86DBA83C2D9520E889BE8EDB81AF85C3C776C6612BE22950",
      "pulseIndex": 1890784,
      "timeStamp": "2026-08-05T12:33:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "ff3d6d90d45ef55486f3432bf7739bebf0d474293fa8ba46418d9e552f7e0f19",
  "id": "019fd1ed-6762-7f40-b5e8-ca8eba210079",
  "inserted_at": "2026-08-05T12:37:04.483001Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "30b864cb1bf1440a143a3ed204399ddc6e00f5bfeeaa71a1c47cd5ee992e4cbf",
  "signature": "T3Tlw5tw8xFbq8xW7zwSsLtMPQhIvUSQcourU/bl5z5q2dvlX9fODRaWXt4dJKZMhubEJ9c92u3C8+LshB3zAw==",
  "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":"679A6E7BD000335E8478270E0D2C0438CEBD4269E25874448E0E599E3FCC6811291172FF9AD7CE1D86DBA83C2D9520E889BE8EDB81AF85C3C776C6612BE22950","pulseIndex":1890784,"timeStamp":"2026-08-05T12:33:00.000Z","version":"2.0"}}

Entropy Hash

ff3d6d90d45ef55486f3432bf7739bebf0d474293fa8ba46418d9e552f7e0f19

Observation Hash

30b864cb1bf1440a143a3ed204399ddc6e00f5bfeeaa71a1c47cd5ee992e4cbf

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: 019fd1ed-6762-7f40-b5e8-ca8eba210079

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 5, 2026, 12:33 PM UTC

Timestamp in NIST pulse 1890784

Truestamp Capture Time

Aug 5, 2026, 12:37 PM 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)

30b864cb1bf1440a143a3ed204399ddc6e00f5bfeeaa71a1c47cd5ee992e4cbf

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

T3Tlw5tw8xFbq8xW7zwSsLtMPQhIvUSQcourU/bl5z5q2dvlX9fODRaWXt4dJKZMhubEJ9c92u3C8+LshB3zAw==

Verify Signature Manually

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