Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd3da-dd0f-7b90-9c49-149f7d90f5c8
Capture Method: Polling
Captured At: Aug 5, 2026, 9:36 PM UTC

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

{
  "block_id": "019fd3db-b8f2-7422-a143-c58f133ef81e",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "ACECD284A54CC0AD4F8197F37F2C40BF2AEDBE93339BB35F72C7C98174414B1CC2EB83E5856A43B8B73000E114B6A7E0152880A810349F06D6734B202879D6D6",
      "pulseIndex": 1891323,
      "timeStamp": "2026-08-05T21:32:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "441ba56d55fec448daf1a215354a80e61aec09a14c068dc92333e56b505eb140",
  "id": "019fd3da-dd0f-7b90-9c49-149f7d90f5c8",
  "inserted_at": "2026-08-05T21:36:03.855787Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "7cf92b9f6f265d558426050a2204cc69e6ef7509b7310b7374393bd0b1950d9d",
  "signature": "gmksWkv04+gkyX6XyrMy8EP3Nj9lAvugLnL/mClhTphkwdmxwJJmf7MxbzvW3EfxPkcvhCq/WqeqOR3b47JjCQ==",
  "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":"ACECD284A54CC0AD4F8197F37F2C40BF2AEDBE93339BB35F72C7C98174414B1CC2EB83E5856A43B8B73000E114B6A7E0152880A810349F06D6734B202879D6D6","pulseIndex":1891323,"timeStamp":"2026-08-05T21:32:00.000Z","version":"2.0"}}

Entropy Hash

441ba56d55fec448daf1a215354a80e61aec09a14c068dc92333e56b505eb140

Observation Hash

7cf92b9f6f265d558426050a2204cc69e6ef7509b7310b7374393bd0b1950d9d

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: 019fd3da-dd0f-7b90-9c49-149f7d90f5c8

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, 9:32 PM UTC

Timestamp in NIST pulse 1891323

Truestamp Capture Time

Aug 5, 2026, 9:36 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)

7cf92b9f6f265d558426050a2204cc69e6ef7509b7310b7374393bd0b1950d9d

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

gmksWkv04+gkyX6XyrMy8EP3Nj9lAvugLnL/mClhTphkwdmxwJJmf7MxbzvW3EfxPkcvhCq/WqeqOR3b47JjCQ==

Verify Signature Manually

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