Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fc8a2-d56b-76a8-8810-5bc98ce0ead6
Capture Method: Polling
Captured At: Aug 3, 2026, 5:19 PM UTC

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

{
  "block_id": "019fc8a3-b6a9-78f8-b328-b813d5efbf9a",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "FCFFFD00429D230C0304E37D54A823964F180E748BF988190809CA450B828FE76EE07B5BE0F265FE15A01E28B260EDD166D674F058974296CAB3C3EC632CE13C",
      "pulseIndex": 1888195,
      "timeStamp": "2026-08-03T17:15:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "9c987e75c3c78366b108126890112b26d242af93d1566b914c862e1bab309c12",
  "id": "019fc8a2-d56b-76a8-8810-5bc98ce0ead6",
  "inserted_at": "2026-08-03T17:19:02.507457Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "c302085fd058cf7f6c9583da03c01a7914f40fcb74524b0e5de61c51a2c94dca",
  "signature": "yxDUk6YGKgnPcACMbWukdRmDqM8uOIyESxj3/YjYiMPeVbgB2te23XA6hh+uRRKIwn0lbnuMsKMK9NR7F3LnCA==",
  "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":"FCFFFD00429D230C0304E37D54A823964F180E748BF988190809CA450B828FE76EE07B5BE0F265FE15A01E28B260EDD166D674F058974296CAB3C3EC632CE13C","pulseIndex":1888195,"timeStamp":"2026-08-03T17:15:00.000Z","version":"2.0"}}

Entropy Hash

9c987e75c3c78366b108126890112b26d242af93d1566b914c862e1bab309c12

Observation Hash

c302085fd058cf7f6c9583da03c01a7914f40fcb74524b0e5de61c51a2c94dca

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: 019fc8a2-d56b-76a8-8810-5bc98ce0ead6

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, 5:15 PM UTC

Timestamp in NIST pulse 1888195

Truestamp Capture Time

Aug 3, 2026, 5:19 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)

c302085fd058cf7f6c9583da03c01a7914f40fcb74524b0e5de61c51a2c94dca

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

yxDUk6YGKgnPcACMbWukdRmDqM8uOIyESxj3/YjYiMPeVbgB2te23XA6hh+uRRKIwn0lbnuMsKMK9NR7F3LnCA==

Verify Signature Manually

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