Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd39c-885e-707d-ad43-e910e9596387
Capture Method: Polling
Captured At: Aug 5, 2026, 8:27 PM UTC

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

{
  "block_id": "019fd39c-8cf5-73d8-88cc-107dc6dd37ea",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "521FC3747DEB2B26F81675E9AB74DAD3C5D4E10E6FC4E5F00FA054CCA457F8740EF412BD66F307D3B3B6B4B3ED81B68C99CAB48774E753510E89B8E98E84327C",
      "pulseIndex": 1891255,
      "timeStamp": "2026-08-05T20:24:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "d05b75b6243187eb308723d551d23cbff7bc1633f8713f044aa2fa4c3d0bee78",
  "id": "019fd39c-885e-707d-ad43-e910e9596387",
  "inserted_at": "2026-08-05T20:27:58.942069Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "f93182a323d17ddead07091f0fe8dee12730225de83abc1420b5ea2bdc5e024d",
  "signature": "H+e2sFiEYxDC/vFJz9Jtlgdd6M6AZUICL4jSD0/crWE+B2zkd/LjgdwvRPYgXz6c87skfVYV74QMT+6QxwQuBw==",
  "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":"521FC3747DEB2B26F81675E9AB74DAD3C5D4E10E6FC4E5F00FA054CCA457F8740EF412BD66F307D3B3B6B4B3ED81B68C99CAB48774E753510E89B8E98E84327C","pulseIndex":1891255,"timeStamp":"2026-08-05T20:24:00.000Z","version":"2.0"}}

Entropy Hash

d05b75b6243187eb308723d551d23cbff7bc1633f8713f044aa2fa4c3d0bee78

Observation Hash

f93182a323d17ddead07091f0fe8dee12730225de83abc1420b5ea2bdc5e024d

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: 019fd39c-885e-707d-ad43-e910e9596387

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, 8:24 PM UTC

Timestamp in NIST pulse 1891255

Truestamp Capture Time

Aug 5, 2026, 8:27 PM UTC

Periodic capture via HTTP polling

Time Difference (Clock Delta)

3 minutes

Source timestamp was 3 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)

f93182a323d17ddead07091f0fe8dee12730225de83abc1420b5ea2bdc5e024d

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

H+e2sFiEYxDC/vFJz9Jtlgdd6M6AZUICL4jSD0/crWE+B2zkd/LjgdwvRPYgXz6c87skfVYV74QMT+6QxwQuBw==

Verify Signature Manually

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