Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd60c-0ce9-76e9-af49-07d89edd07fb
Capture Method: Polling
Captured At: Aug 6, 2026, 7:49 AM UTC

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

{
  "block_id": "019fd60c-f0bd-7c64-b80c-ce487fca30c0",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "A4F5157E06E21AD7430D1489D3050C0D385F2329942A561E3EFAFF44A6AE9D206AE0C343639C12C41B66DBBFA673B7AF791D9A02212103EC29E7340E65969C39",
      "pulseIndex": 1891936,
      "timeStamp": "2026-08-06T07:45:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "0d6e57758eb0287b04ac89e95092351126d4b516ced96bae530ff5f02f68cbb6",
  "id": "019fd60c-0ce9-76e9-af49-07d89edd07fb",
  "inserted_at": "2026-08-06T07:49:01.801472Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "29f7ad26b5d9982473b0e5ffe9e16c27831f9e5e48607090854388c265f523b2",
  "signature": "IuqSJoeyaT6Z0FQimeJviIN7XzufXfelLKPOaBmPGysx41FwZUKFo3gs1dBqAtsgMi4xRFBbqMXpQOtdsu2OBg==",
  "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":"A4F5157E06E21AD7430D1489D3050C0D385F2329942A561E3EFAFF44A6AE9D206AE0C343639C12C41B66DBBFA673B7AF791D9A02212103EC29E7340E65969C39","pulseIndex":1891936,"timeStamp":"2026-08-06T07:45:00.000Z","version":"2.0"}}

Entropy Hash

0d6e57758eb0287b04ac89e95092351126d4b516ced96bae530ff5f02f68cbb6

Observation Hash

29f7ad26b5d9982473b0e5ffe9e16c27831f9e5e48607090854388c265f523b2

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: 019fd60c-0ce9-76e9-af49-07d89edd07fb

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, 7:45 AM UTC

Timestamp in NIST pulse 1891936

Truestamp Capture Time

Aug 6, 2026, 7:49 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)

29f7ad26b5d9982473b0e5ffe9e16c27831f9e5e48607090854388c265f523b2

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

IuqSJoeyaT6Z0FQimeJviIN7XzufXfelLKPOaBmPGysx41FwZUKFo3gs1dBqAtsgMi4xRFBbqMXpQOtdsu2OBg==

Verify Signature Manually

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