Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fc90b-29ce-736e-bc7a-0fd73d07ee8f
Capture Method: Polling
Captured At: Aug 3, 2026, 7:12 PM UTC

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

{
  "block_id": "019fc90b-2ada-72e1-bbed-727f98287174",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "4950C637C535BD8417B7B0462FDBBB269EC67689E9BC438DB91081A55B3083CB9F05FDB6498DDDF016D37CFEFE56C2B6CDF88B5EB77386FA00FE8FF572934850",
      "pulseIndex": 1888309,
      "timeStamp": "2026-08-03T19:09:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "9372fbd1152a26e0b90eb876937e4539b62fde7999c332427f36db071b96d81b",
  "id": "019fc90b-29ce-736e-bc7a-0fd73d07ee8f",
  "inserted_at": "2026-08-03T19:12:59.854253Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "dca068f06523cb0c0b07fc086c576f85d90a0e2afa3b1101e1153624a807e1f5",
  "signature": "BToE/rxz9H+whkuOZ505UnJ82nDAK2DI8AHJgwuCLkCHdircDTrVBbuwNC6zKt9Kw9Qtf61p8BEzabGtwko9CA==",
  "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":"4950C637C535BD8417B7B0462FDBBB269EC67689E9BC438DB91081A55B3083CB9F05FDB6498DDDF016D37CFEFE56C2B6CDF88B5EB77386FA00FE8FF572934850","pulseIndex":1888309,"timeStamp":"2026-08-03T19:09:00.000Z","version":"2.0"}}

Entropy Hash

9372fbd1152a26e0b90eb876937e4539b62fde7999c332427f36db071b96d81b

Observation Hash

dca068f06523cb0c0b07fc086c576f85d90a0e2afa3b1101e1153624a807e1f5

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: 019fc90b-29ce-736e-bc7a-0fd73d07ee8f

Time Delta

NIST Beacon pulses include a timestamp representing when the pulse was generated. Under normal operation, pulses are generated every 60 seconds. Large time differences indicate the beacon service may be offline or experiencing issues.

NIST Beacon Pulse Time

Aug 3, 2026, 7:09 PM UTC

Timestamp in NIST pulse 1888309

Truestamp Capture Time

Aug 3, 2026, 7:12 PM UTC

Periodic capture via HTTP polling

Time Difference (Clock Delta)

4 minutes

Source timestamp was 4 minutes behind capture time

Interpretation: A moderate delta (under 1 hour) may indicate temporary service delays or network issues.

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)

dca068f06523cb0c0b07fc086c576f85d90a0e2afa3b1101e1153624a807e1f5

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

BToE/rxz9H+whkuOZ505UnJ82nDAK2DI8AHJgwuCLkCHdircDTrVBbuwNC6zKt9Kw9Qtf61p8BEzabGtwko9CA==

Verify Signature Manually

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