Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd624-d411-7ee8-9ca8-3de2096e7d89
Capture Method: Polling
Captured At: Aug 6, 2026, 8:16 AM UTC

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

{
  "block_id": "019fd625-a8e1-7ebf-bf55-8b7338844151",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "11E67D2256560CFB1CABBF4707745290B66EB34557B56F5C3E4E5D69E27D8C9EF715139D1B357F5B466C3F78D6355C1C1F017B60DEB23462CEEBEE3B91D232A3",
      "pulseIndex": 1891963,
      "timeStamp": "2026-08-06T08:12:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "fc088d7724bef8106a2a983bdeafdca21c58c296f892515da738e6490c0a99e9",
  "id": "019fd624-d411-7ee8-9ca8-3de2096e7d89",
  "inserted_at": "2026-08-06T08:16:05.649969Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "d754a5e4c5002ed7045f37cf70597a6457cfccc7dd2c41c3e6a4b376018a8b1a",
  "signature": "Lr1WXtBPc2GPPvMLqfJjZBzNDbKDaXQkgHypBvhxpfq/23qK5oLP4ZfMb41+Ba0W5UosE7/Dj4OzbZK1XSiACg==",
  "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":"11E67D2256560CFB1CABBF4707745290B66EB34557B56F5C3E4E5D69E27D8C9EF715139D1B357F5B466C3F78D6355C1C1F017B60DEB23462CEEBEE3B91D232A3","pulseIndex":1891963,"timeStamp":"2026-08-06T08:12:00.000Z","version":"2.0"}}

Entropy Hash

fc088d7724bef8106a2a983bdeafdca21c58c296f892515da738e6490c0a99e9

Observation Hash

d754a5e4c5002ed7045f37cf70597a6457cfccc7dd2c41c3e6a4b376018a8b1a

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: 019fd624-d411-7ee8-9ca8-3de2096e7d89

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, 8:12 AM UTC

Timestamp in NIST pulse 1891963

Truestamp Capture Time

Aug 6, 2026, 8:16 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)

d754a5e4c5002ed7045f37cf70597a6457cfccc7dd2c41c3e6a4b376018a8b1a

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

Lr1WXtBPc2GPPvMLqfJjZBzNDbKDaXQkgHypBvhxpfq/23qK5oLP4ZfMb41+Ba0W5UosE7/Dj4OzbZK1XSiACg==

Verify Signature Manually

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