Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fc92b-59eb-779d-8fe8-8d34d3a19d70
Capture Method: Polling
Captured At: Aug 3, 2026, 7:48 PM UTC

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

{
  "block_id": "019fc92c-203e-7442-aedc-b2fe099f791d",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "489E21B2301760037F84A6434A60C4B5923A1287A46558F2EA1CD08BEEE7FD774754787610578C8E6B1BCA926BC783D915BC2B9E9C87CC13D94F3E4F6A0D9291",
      "pulseIndex": 1888344,
      "timeStamp": "2026-08-03T19:44:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "f49ac73520b480d4991deb3e524592b824e11313a00e88d8f977911c28f2e2eb",
  "id": "019fc92b-59eb-779d-8fe8-8d34d3a19d70",
  "inserted_at": "2026-08-03T19:48:09.323516Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "c3b73a5ff9cd6f2f3306cc58c797d97cb016b08d536b1481b470b1cd7571e0ad",
  "signature": "2QZvRXObI7ZQrlDpq3hqn0vREjmail2yUCDWoiWN5nWJsneFhR8a4B/DRyhyNWoRYbbeB6X05vGcHdFfV4aNDA==",
  "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":"489E21B2301760037F84A6434A60C4B5923A1287A46558F2EA1CD08BEEE7FD774754787610578C8E6B1BCA926BC783D915BC2B9E9C87CC13D94F3E4F6A0D9291","pulseIndex":1888344,"timeStamp":"2026-08-03T19:44:00.000Z","version":"2.0"}}

Entropy Hash

f49ac73520b480d4991deb3e524592b824e11313a00e88d8f977911c28f2e2eb

Observation Hash

c3b73a5ff9cd6f2f3306cc58c797d97cb016b08d536b1481b470b1cd7571e0ad

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: 019fc92b-59eb-779d-8fe8-8d34d3a19d70

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, 7:44 PM UTC

Timestamp in NIST pulse 1888344

Truestamp Capture Time

Aug 3, 2026, 7:48 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)

c3b73a5ff9cd6f2f3306cc58c797d97cb016b08d536b1481b470b1cd7571e0ad

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

2QZvRXObI7ZQrlDpq3hqn0vREjmail2yUCDWoiWN5nWJsneFhR8a4B/DRyhyNWoRYbbeB6X05vGcHdFfV4aNDA==

Verify Signature Manually

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