Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd667-977d-7112-a8c0-16e2b27fcb63
Capture Method: Polling
Captured At: Aug 6, 2026, 9:29 AM UTC

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

{
  "block_id": "019fd668-7e8c-7449-b409-9a00d9d960b5",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "55D7DF65AD73207B082092E7CE9F1E6AF121AEAC891F15825BDBABC7485C559C89F328F7264E49E2E9917A27DD8556D7DB22C3A187A51DD1882297ED60D34745",
      "pulseIndex": 1892036,
      "timeStamp": "2026-08-06T09:25:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "0bfb0018840babae0c57ad96ac07f9a2d0d62316d6d45c87bf909a48ac1c237b",
  "id": "019fd667-977d-7112-a8c0-16e2b27fcb63",
  "inserted_at": "2026-08-06T09:29:01.053106Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "cb1c6b204ff6a03268daf9c91ce33bc7e94f54b7d435c1d173e6042470bb0d67",
  "signature": "XiNpdfHOoz/rpIUAbEPaQRV/YFU9ZiAjcgIRDTU0LHhKYGb+4xB7EMJkJAVIvgcKEqV/HpFoNyvvhpFHv3YVDA==",
  "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":"55D7DF65AD73207B082092E7CE9F1E6AF121AEAC891F15825BDBABC7485C559C89F328F7264E49E2E9917A27DD8556D7DB22C3A187A51DD1882297ED60D34745","pulseIndex":1892036,"timeStamp":"2026-08-06T09:25:00.000Z","version":"2.0"}}

Entropy Hash

0bfb0018840babae0c57ad96ac07f9a2d0d62316d6d45c87bf909a48ac1c237b

Observation Hash

cb1c6b204ff6a03268daf9c91ce33bc7e94f54b7d435c1d173e6042470bb0d67

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: 019fd667-977d-7112-a8c0-16e2b27fcb63

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, 9:25 AM UTC

Timestamp in NIST pulse 1892036

Truestamp Capture Time

Aug 6, 2026, 9:29 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)

cb1c6b204ff6a03268daf9c91ce33bc7e94f54b7d435c1d173e6042470bb0d67

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

XiNpdfHOoz/rpIUAbEPaQRV/YFU9ZiAjcgIRDTU0LHhKYGb+4xB7EMJkJAVIvgcKEqV/HpFoNyvvhpFHv3YVDA==

Verify Signature Manually

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