Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fc9ba-141c-7f73-aed5-fc598c4afe1d
Capture Method: Polling
Captured At: Aug 3, 2026, 10:24 PM UTC

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

{
  "block_id": "019fc9ba-f316-7f78-ae78-3cfd1bf945f6",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "D9FF03E6922CE5C341230681F5BAADC92028359649C22351A24AAC35E33D626B02C97184A907973F5BAF0A45F5AD54BD3A9BEA431885999CCC883F00F6CEBA84",
      "pulseIndex": 1888500,
      "timeStamp": "2026-08-03T22:20:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "d35f365c3ce19100b04d3400d61fcb6f1c82237ed65b2fb623898ea14280e163",
  "id": "019fc9ba-141c-7f73-aed5-fc598c4afe1d",
  "inserted_at": "2026-08-03T22:24:03.101026Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "f502552845b17744d195bc2391c07904b1d89f817567b7cde3b00b53b3c339d8",
  "signature": "uIFckTRVYTCW/l9H4Z8kHFX1QVFmxQ5ksHexjVDqd/FiL6miQrDVBGULwz1kgqCAnGadUHeeGFv2NsH3MUYPBw==",
  "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":"D9FF03E6922CE5C341230681F5BAADC92028359649C22351A24AAC35E33D626B02C97184A907973F5BAF0A45F5AD54BD3A9BEA431885999CCC883F00F6CEBA84","pulseIndex":1888500,"timeStamp":"2026-08-03T22:20:00.000Z","version":"2.0"}}

Entropy Hash

d35f365c3ce19100b04d3400d61fcb6f1c82237ed65b2fb623898ea14280e163

Observation Hash

f502552845b17744d195bc2391c07904b1d89f817567b7cde3b00b53b3c339d8

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: 019fc9ba-141c-7f73-aed5-fc598c4afe1d

Time Delta

NIST Beacon pulses include a timestamp representing when the pulse was generated. Under normal operation, pulses are generated every 60 seconds. Large time differences indicate the beacon service may be offline or experiencing issues.

NIST Beacon Pulse Time

Aug 3, 2026, 10:20 PM UTC

Timestamp in NIST pulse 1888500

Truestamp Capture Time

Aug 3, 2026, 10:24 PM UTC

Periodic capture via HTTP polling

Time Difference (Clock Delta)

4 minutes

Source timestamp was 4 minutes behind capture time

Interpretation: A moderate delta (under 1 hour) may indicate temporary service delays or network issues.

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)

f502552845b17744d195bc2391c07904b1d89f817567b7cde3b00b53b3c339d8

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

uIFckTRVYTCW/l9H4Z8kHFX1QVFmxQ5ksHexjVDqd/FiL6miQrDVBGULwz1kgqCAnGadUHeeGFv2NsH3MUYPBw==

Verify Signature Manually

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