Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd58d-b005-7e3c-9a30-beaa2fab7136
Capture Method: Polling
Captured At: Aug 6, 2026, 5:31 AM UTC

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

{
  "block_id": "019fd58e-98e6-7fbd-8d7f-33b4a4280562",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "6C0E91DA5ABF08D0B8F8BA4B6AC8CA19368689DD66A97005E29F8EE81ABBA793E8453143D6A4F632A95E94539678C254F7AD9B676CC3759A164A9BAE931965C1",
      "pulseIndex": 1891798,
      "timeStamp": "2026-08-06T05:27:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "efbd410a60d17998c6c0c647fc2647b153de8e431db1eaa9d5e644195c51ff1e",
  "id": "019fd58d-b005-7e3c-9a30-beaa2fab7136",
  "inserted_at": "2026-08-06T05:31:00.485932Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "d4b36018bcb1d0fb20ce9bd1c2ff257bbc3fb59d621b95b4a4209c7252cece78",
  "signature": "2qZM0ujSWGURgNefo4wfbKhxHGnU/WPOMP4sdgTW8RGwp19mhIidku/K0hmdPPIn7ww068ovJS+qT5Kd8ETFCQ==",
  "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":"6C0E91DA5ABF08D0B8F8BA4B6AC8CA19368689DD66A97005E29F8EE81ABBA793E8453143D6A4F632A95E94539678C254F7AD9B676CC3759A164A9BAE931965C1","pulseIndex":1891798,"timeStamp":"2026-08-06T05:27:00.000Z","version":"2.0"}}

Entropy Hash

efbd410a60d17998c6c0c647fc2647b153de8e431db1eaa9d5e644195c51ff1e

Observation Hash

d4b36018bcb1d0fb20ce9bd1c2ff257bbc3fb59d621b95b4a4209c7252cece78

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: 019fd58d-b005-7e3c-9a30-beaa2fab7136

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, 5:27 AM UTC

Timestamp in NIST pulse 1891798

Truestamp Capture Time

Aug 6, 2026, 5:31 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)

d4b36018bcb1d0fb20ce9bd1c2ff257bbc3fb59d621b95b4a4209c7252cece78

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

2qZM0ujSWGURgNefo4wfbKhxHGnU/WPOMP4sdgTW8RGwp19mhIidku/K0hmdPPIn7ww068ovJS+qT5Kd8ETFCQ==

Verify Signature Manually

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