Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fc90f-d108-7a5f-9741-8b9ef68a54a1
Capture Method: Polling
Captured At: Aug 3, 2026, 7:18 PM UTC

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

{
  "block_id": "019fc910-a90d-7ec0-8054-848c553612b8",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "90A1CF53AA3C2E26313685C956B3489315E13C3B3B8081E1FB3D314E88EB17FC8666D6E49DB451E994CE0C3B8FE0316C5BE23D0A04D38AB314B4635644A40E01",
      "pulseIndex": 1888314,
      "timeStamp": "2026-08-03T19:14:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "3040ba96a852965f92e0ebad68dc001a57c03cdff8e6089195a0910a880af34f",
  "id": "019fc90f-d108-7a5f-9741-8b9ef68a54a1",
  "inserted_at": "2026-08-03T19:18:04.808688Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "a76b1a3e219393848e2ec9f136faa9da0ad9159ae363a3da7b2d6f453e158146",
  "signature": "J+InHuhPEAHz6BNGvOxLJq62lWK8ZZU0UI58/MOZ2Bsrl2JmZVuEEfuPfCWAQ7fx68kuo4TreJqBG9lvxNjNAg==",
  "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":"90A1CF53AA3C2E26313685C956B3489315E13C3B3B8081E1FB3D314E88EB17FC8666D6E49DB451E994CE0C3B8FE0316C5BE23D0A04D38AB314B4635644A40E01","pulseIndex":1888314,"timeStamp":"2026-08-03T19:14:00.000Z","version":"2.0"}}

Entropy Hash

3040ba96a852965f92e0ebad68dc001a57c03cdff8e6089195a0910a880af34f

Observation Hash

a76b1a3e219393848e2ec9f136faa9da0ad9159ae363a3da7b2d6f453e158146

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: 019fc90f-d108-7a5f-9741-8b9ef68a54a1

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, 7:14 PM UTC

Timestamp in NIST pulse 1888314

Truestamp Capture Time

Aug 3, 2026, 7:18 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)

a76b1a3e219393848e2ec9f136faa9da0ad9159ae363a3da7b2d6f453e158146

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

J+InHuhPEAHz6BNGvOxLJq62lWK8ZZU0UI58/MOZ2Bsrl2JmZVuEEfuPfCWAQ7fx68kuo4TreJqBG9lvxNjNAg==

Verify Signature Manually

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