Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd27b-417f-7b8b-87da-b60ce137a65c
Capture Method: Polling
Captured At: Aug 5, 2026, 3:12 PM UTC

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

{
  "block_id": "019fd27c-28d3-7c14-92ae-f167315e94b6",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "72CB6B45E0F595860F12C8F65290470FECA1050470275CD5E3F19B6E680EA31E95383160C29A645DACAD70B727FCE2F43F5F1AB141460DA5C7938524E06A1E13",
      "pulseIndex": 1890939,
      "timeStamp": "2026-08-05T15:08:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "62e39575c8c6c50c2d97e73f6f454dac6ee3ff25e8412f9b4da230575f2c5854",
  "id": "019fd27b-417f-7b8b-87da-b60ce137a65c",
  "inserted_at": "2026-08-05T15:12:00.895810Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "dc8e545b06dd84a6d474984d71e2e09f8819af9324267213d6411df3c60ed667",
  "signature": "twWwE1uJEOqfhJFNLmJxWDNyAHaspr4Y+nLx1JySw4wkB11Vta9ZuEUWd7Lu1gU5Lc4XfSfDQyRqF8HmgJcjBA==",
  "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":"72CB6B45E0F595860F12C8F65290470FECA1050470275CD5E3F19B6E680EA31E95383160C29A645DACAD70B727FCE2F43F5F1AB141460DA5C7938524E06A1E13","pulseIndex":1890939,"timeStamp":"2026-08-05T15:08:00.000Z","version":"2.0"}}

Entropy Hash

62e39575c8c6c50c2d97e73f6f454dac6ee3ff25e8412f9b4da230575f2c5854

Observation Hash

dc8e545b06dd84a6d474984d71e2e09f8819af9324267213d6411df3c60ed667

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: 019fd27b-417f-7b8b-87da-b60ce137a65c

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, 3:08 PM UTC

Timestamp in NIST pulse 1890939

Truestamp Capture Time

Aug 5, 2026, 3:12 PM 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)

dc8e545b06dd84a6d474984d71e2e09f8819af9324267213d6411df3c60ed667

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

twWwE1uJEOqfhJFNLmJxWDNyAHaspr4Y+nLx1JySw4wkB11Vta9ZuEUWd7Lu1gU5Lc4XfSfDQyRqF8HmgJcjBA==

Verify Signature Manually

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