SYEN Audit

Audit trail for AI systems. Log every decision. Detect tampering. Prove compliance.

Founded by an ex-Mastercard security engineer. Based in New York.

available on: AWS Marketplace | Azure Marketplace

what it does

  • locked records - every AI action gets a unique fingerprint. change the data, the fingerprint breaks. you will know.
  • linked chain - each record links to the one before it. change one, the whole chain shows it. no hiding.
  • audit ready - pull proof for any AI decision in seconds. show regulators the full sequence of events.

how it works

  1. capture - your AI makes a decision. we log it.
  2. fingerprint - we create a unique code for that record.
  3. link - we connect it to the record before it.
  4. lock - we sign it so no one can change it.

try the api

click each step to see what the API returns.

Click each step to simulate the API workflow

// Awaiting request

Request Body

{
"event_class": "EXECUTION",
"event_type": "credit.decision.made",
"stream_id": "tenant-123:prod-us-east-1:credit-decisions",
"payload":
{
"applicant_id": "app-991",
"decision": "APPROVED",
"score": 740
}
,
"decision_surface":
{
"explainability_artifact_hash": "a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e...",
"human_decision": "APPROVE",
"presentation_timestamp": "2026-03-16T14:00:00Z",
"signoff_timestamp": "2026-03-16T14:00:03Z",
"decision_complexity_tier": 2
}
,
"context":
{
"trace_id": "abc-123-def-456",
"episode_id": "ep-001",
"episode_step_number": 3,
"prompt_hash": "d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b...",
"pii_detected": false,
"compliance_gate_result": "APPROVED",
"model_version": "risk-engine-v2.1.0",
"cloud_provider": "aws",
"cloud_region": "us-east-1"
}
}

Response 201 Created

// Awaiting request
// Awaiting request
// Awaiting request
⚓

RFC 3161 Timestamp Anchor

Once a day, we stamp all records with a trusted third party. Anyone can verify it.

Daily Anchor Record

{
"date_utc": "2026-03-15",
"anchor_status": "complete",
"stream_ids_included": [
"tenant-123:prod-us-east-1:credit-decisions",
"tenant-123:prod-us-east-1:trade-executions"
],
"daily_merkle_root": "a3f8c2d1e4b5a6f7c8d9e0a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f...",
"tsa_url": "http://timestamp.digicert.com",
"anchor_created_at": "2026-03-16T00:01:04Z",
"verification_command": "echo 'MIIEtz...' | base64 -d > token.tsr && openssl ts -v..."
}