Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd54b-d37e-700f-b274-96d44efe5c5c
Capture Method: Polling
Captured At: Aug 6, 2026, 4:19 AM UTC

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

{
  "block_id": "019fd54c-ae2f-708e-8dce-656b12c73ffb",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "95C9B2CA6322713F987D595E21EAB03E88061A3C84454A6769409EEDB964DA80256267888839FC40CF3B433A1329A1B8596F019F4F79D15B3E27E6F798A485A3",
      "pulseIndex": 1891726,
      "timeStamp": "2026-08-06T04:15:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "303c256c0f9df62249796f22cd345890b041d26dbc484f738fa9c9436091484c",
  "id": "019fd54b-d37e-700f-b274-96d44efe5c5c",
  "inserted_at": "2026-08-06T04:19:04.190053Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "c511610ca4e527c92c3249f27f2303380fbfb3ff79eafea9eee17799f77d62c4",
  "signature": "5M56JEu8FaNWZrfXwHQYCY9WwruYpM5arboXExsb2BGbiLBqkNpQomXtSqdSBsRVhOpKihGounwnIPxE1Wy1BA==",
  "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":"95C9B2CA6322713F987D595E21EAB03E88061A3C84454A6769409EEDB964DA80256267888839FC40CF3B433A1329A1B8596F019F4F79D15B3E27E6F798A485A3","pulseIndex":1891726,"timeStamp":"2026-08-06T04:15:00.000Z","version":"2.0"}}

Entropy Hash

303c256c0f9df62249796f22cd345890b041d26dbc484f738fa9c9436091484c

Observation Hash

c511610ca4e527c92c3249f27f2303380fbfb3ff79eafea9eee17799f77d62c4

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: 019fd54b-d37e-700f-b274-96d44efe5c5c

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, 4:15 AM UTC

Timestamp in NIST pulse 1891726

Truestamp Capture Time

Aug 6, 2026, 4:19 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)

c511610ca4e527c92c3249f27f2303380fbfb3ff79eafea9eee17799f77d62c4

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

5M56JEu8FaNWZrfXwHQYCY9WwruYpM5arboXExsb2BGbiLBqkNpQomXtSqdSBsRVhOpKihGounwnIPxE1Wy1BA==

Verify Signature Manually

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