Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fc928-9756-7714-b824-9f72c0b17c42
Capture Method: Polling
Captured At: Aug 3, 2026, 7:45 PM UTC

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

{
  "block_id": "019fc929-6140-709c-afc8-f4dc5631836c",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "FA706F77A9B1CB60836EB00722D74DC85AB71D4B2C86D9CA23C0F9C35B4ABCFD665B269EE6DCDA6D0DE857707A01DB0FCD8B29602F7588294A9071DF3EACF5D2",
      "pulseIndex": 1888341,
      "timeStamp": "2026-08-03T19:41:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "d2c797beb964dd9fed68da3ac2dbfec7e4d7ec4b81dd2ac0860a182c744f89a8",
  "id": "019fc928-9756-7714-b824-9f72c0b17c42",
  "inserted_at": "2026-08-03T19:45:08.438482Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "2a66b48103f44ce2d6505d9dfd584dc795917b6134e2364c862c374268a93892",
  "signature": "5tZKVAU1Hy3DCD7P6eGnl0/uQI605/KRBqfvl6ziXns/hx17xLeS7wDe9kBkxkUtFXgkFpdI5Aj17ENNuAo7Aw==",
  "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":"FA706F77A9B1CB60836EB00722D74DC85AB71D4B2C86D9CA23C0F9C35B4ABCFD665B269EE6DCDA6D0DE857707A01DB0FCD8B29602F7588294A9071DF3EACF5D2","pulseIndex":1888341,"timeStamp":"2026-08-03T19:41:00.000Z","version":"2.0"}}

Entropy Hash

d2c797beb964dd9fed68da3ac2dbfec7e4d7ec4b81dd2ac0860a182c744f89a8

Observation Hash

2a66b48103f44ce2d6505d9dfd584dc795917b6134e2364c862c374268a93892

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: 019fc928-9756-7714-b824-9f72c0b17c42

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, 7:41 PM UTC

Timestamp in NIST pulse 1888341

Truestamp Capture Time

Aug 3, 2026, 7:45 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)

2a66b48103f44ce2d6505d9dfd584dc795917b6134e2364c862c374268a93892

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

5tZKVAU1Hy3DCD7P6eGnl0/uQI605/KRBqfvl6ziXns/hx17xLeS7wDe9kBkxkUtFXgkFpdI5Aj17ENNuAo7Aw==

Verify Signature Manually

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