Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd18e-2244-7ed6-bce9-18c9a3e478cd
Capture Method: Polling
Captured At: Aug 5, 2026, 10:53 AM UTC

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

{
  "block_id": "019fd18f-09b3-74f6-86aa-eab57388e638",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "56E28E86073ACD398955A8570B9C93AEF4239C3FA2B27AE1A1B562723936EA2789CEFD00B8ECE8A0C1F018D63997DC3B5F576B593B8FEF32076A18126E236A8B",
      "pulseIndex": 1890680,
      "timeStamp": "2026-08-05T10:49:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "96a023bc34dc2c9bac4844dd5fd50f97a9ad7065443ed77fe5a3367632f52c1c",
  "id": "019fd18e-2244-7ed6-bce9-18c9a3e478cd",
  "inserted_at": "2026-08-05T10:53:00.868963Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "66b9a84badbf971606ae85a316b8c1dccd7ac2d0338d65345d21dde237882c67",
  "signature": "wtO2zHhvKTXHwpaxmssTTZN1MZoB90tCwAuvUvwrPnldxDKKxQ3u6LWBdDod2JrsCe+kThiQYvUH1ItCCZF+CA==",
  "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":"56E28E86073ACD398955A8570B9C93AEF4239C3FA2B27AE1A1B562723936EA2789CEFD00B8ECE8A0C1F018D63997DC3B5F576B593B8FEF32076A18126E236A8B","pulseIndex":1890680,"timeStamp":"2026-08-05T10:49:00.000Z","version":"2.0"}}

Entropy Hash

96a023bc34dc2c9bac4844dd5fd50f97a9ad7065443ed77fe5a3367632f52c1c

Observation Hash

66b9a84badbf971606ae85a316b8c1dccd7ac2d0338d65345d21dde237882c67

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: 019fd18e-2244-7ed6-bce9-18c9a3e478cd

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, 10:49 AM UTC

Timestamp in NIST pulse 1890680

Truestamp Capture Time

Aug 5, 2026, 10:53 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)

66b9a84badbf971606ae85a316b8c1dccd7ac2d0338d65345d21dde237882c67

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

wtO2zHhvKTXHwpaxmssTTZN1MZoB90tCwAuvUvwrPnldxDKKxQ3u6LWBdDod2JrsCe+kThiQYvUH1ItCCZF+CA==

Verify Signature Manually

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