Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd56d-b4d8-7242-9241-75e664863d09
Capture Method: Polling
Captured At: Aug 6, 2026, 4:56 AM UTC

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

{
  "block_id": "019fd56e-8dd6-7c05-8b68-125999a6a010",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "2A4C6401E5109FBFCEA4D61D50B3B82E29D5DAD5E73C4740BAF1BF8D87910617FF44F3FA96BBB6210F7BCD9FAA3200112519ABD364C1047249002C3198BDF689",
      "pulseIndex": 1891763,
      "timeStamp": "2026-08-06T04:52:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "33d1f70bda6d2f5eb36894c57e6a66211a132c0d36ff2ce3dab1bddfcda19eb7",
  "id": "019fd56d-b4d8-7242-9241-75e664863d09",
  "inserted_at": "2026-08-06T04:56:04.568187Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "6507c6cb89efe60468078f5aaefa7035f5a6f69156bee029ccbc236b9770c2ef",
  "signature": "HkjigtD2h0OqrznDuUZXOvtmYOFbq1boKSp/gbV2YelN0ztRjvtOueWpGhIAu974yaje2RJrTQGIa9woaN7mBQ==",
  "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":"2A4C6401E5109FBFCEA4D61D50B3B82E29D5DAD5E73C4740BAF1BF8D87910617FF44F3FA96BBB6210F7BCD9FAA3200112519ABD364C1047249002C3198BDF689","pulseIndex":1891763,"timeStamp":"2026-08-06T04:52:00.000Z","version":"2.0"}}

Entropy Hash

33d1f70bda6d2f5eb36894c57e6a66211a132c0d36ff2ce3dab1bddfcda19eb7

Observation Hash

6507c6cb89efe60468078f5aaefa7035f5a6f69156bee029ccbc236b9770c2ef

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: 019fd56d-b4d8-7242-9241-75e664863d09

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 6, 2026, 4:52 AM UTC

Timestamp in NIST pulse 1891763

Truestamp Capture Time

Aug 6, 2026, 4:56 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)

6507c6cb89efe60468078f5aaefa7035f5a6f69156bee029ccbc236b9770c2ef

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

HkjigtD2h0OqrznDuUZXOvtmYOFbq1boKSp/gbV2YelN0ztRjvtOueWpGhIAu974yaje2RJrTQGIa9woaN7mBQ==

Verify Signature Manually

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