Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd370-93bd-71bc-949c-64839d7ec486
Capture Method: Polling
Captured At: Aug 5, 2026, 7:39 PM UTC

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

{
  "block_id": "019fd370-9afa-7369-a5f5-fdf5abc6c8f0",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "287D4D06E39EC310E2236E4F2B4AD13979FC6D4015E73FB16E167589A70052EF80C9115A4514B71449CB8DD58890E1523582377E3CC6BCDA91AB5981479C97A1",
      "pulseIndex": 1891207,
      "timeStamp": "2026-08-05T19:36:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "cd104a8829e57314e7d62d57f04ea8ae969ae93176c8fff802a37b685102fb31",
  "id": "019fd370-93bd-71bc-949c-64839d7ec486",
  "inserted_at": "2026-08-05T19:39:58.269147Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "c988fc18b92ab9f3a3d235474781359e10efb09747bee68e9329d7c27c065efc",
  "signature": "xWA/vzH7sdDZF1/XoI1srUT7Io298t1OSvnJk/r+Xuzsr7B+o0XEjKkTjiHAnkc97UvG/iic0JdSJ+p7O10YCA==",
  "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":"287D4D06E39EC310E2236E4F2B4AD13979FC6D4015E73FB16E167589A70052EF80C9115A4514B71449CB8DD58890E1523582377E3CC6BCDA91AB5981479C97A1","pulseIndex":1891207,"timeStamp":"2026-08-05T19:36:00.000Z","version":"2.0"}}

Entropy Hash

cd104a8829e57314e7d62d57f04ea8ae969ae93176c8fff802a37b685102fb31

Observation Hash

c988fc18b92ab9f3a3d235474781359e10efb09747bee68e9329d7c27c065efc

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: 019fd370-93bd-71bc-949c-64839d7ec486

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 5, 2026, 7:36 PM UTC

Timestamp in NIST pulse 1891207

Truestamp Capture Time

Aug 5, 2026, 7:39 PM UTC

Periodic capture via HTTP polling

Time Difference (Clock Delta)

3 minutes

Source timestamp was 3 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)

c988fc18b92ab9f3a3d235474781359e10efb09747bee68e9329d7c27c065efc

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

xWA/vzH7sdDZF1/XoI1srUT7Io298t1OSvnJk/r+Xuzsr7B+o0XEjKkTjiHAnkc97UvG/iic0JdSJ+p7O10YCA==

Verify Signature Manually

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