Entropy

NIST Beacon Observation

An independently verifiable temporal proof from an external entropy source.

Observation ID: 019fd185-eb66-7c71-b594-b6b89641c8f7
Capture Method: Polling
Captured At: Aug 5, 2026, 10:44 AM UTC

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

{
  "block_id": "019fd186-cc52-70e4-8649-a1254cdbe3b0",
  "capture_method": "http_poll",
  "entropy": {
    "pulse": {
      "chainIndex": 2,
      "outputValue": "4D40BFE6CF40336D56F75C66488BB90575608CF01C11A4632BD2C11AA4C503D30DD2677C966F8F1A5D58B24216C982893E08AE956730CB770310098CCA27E7B5",
      "pulseIndex": 1890671,
      "timeStamp": "2026-08-05T10:40:00.000Z",
      "version": "2.0"
    }
  },
  "entropy_hash": "f11e31bed389242883f4eb8c6d2cb64b777ecabf71e6e47afebf981275237cba",
  "id": "019fd185-eb66-7c71-b594-b6b89641c8f7",
  "inserted_at": "2026-08-05T10:44:02.534815Z",
  "metadata": {},
  "metadata_hash": "5dd81d4309de99c9f8e70822e760f0eece8c33370ff5fb5da3af75bab0cbaab8",
  "observation_hash": "76102fefd1c301aace9f2204c7d13371f102e36b3bf9aacd691f63653a6a1e33",
  "signature": "pCesiBhGKFuxetmiPmRr76UgdkbpQPepxvs2u13spAV6+bvhAeIYTyr8fO5eqGcLsaLAEIt/iVmm8d0VW9sMCg==",
  "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":"4D40BFE6CF40336D56F75C66488BB90575608CF01C11A4632BD2C11AA4C503D30DD2677C966F8F1A5D58B24216C982893E08AE956730CB770310098CCA27E7B5","pulseIndex":1890671,"timeStamp":"2026-08-05T10:40:00.000Z","version":"2.0"}}

Entropy Hash

f11e31bed389242883f4eb8c6d2cb64b777ecabf71e6e47afebf981275237cba

Observation Hash

76102fefd1c301aace9f2204c7d13371f102e36b3bf9aacd691f63653a6a1e33

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: 019fd185-eb66-7c71-b594-b6b89641c8f7

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, 10:40 AM UTC

Timestamp in NIST pulse 1890671

Truestamp Capture Time

Aug 5, 2026, 10:44 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)

76102fefd1c301aace9f2204c7d13371f102e36b3bf9aacd691f63653a6a1e33

Public Key (Base64 encoded)

1hHbF5H5u8LiSp+nVMRb8duR2eGkOo5Q1JYfcmAtF28=

Signature (Base64 encoded)

pCesiBhGKFuxetmiPmRr76UgdkbpQPepxvs2u13spAV6+bvhAeIYTyr8fO5eqGcLsaLAEIt/iVmm8d0VW9sMCg==

Verify Signature Manually

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