swt3-ai 0.3.4

SWT3 AI Witness SDK: cryptographic attestation for AI inference

Witness your AI. Prove it followed the rules. Cryptographic accountability for every inference, tool call, and resource access.

swt3-ai

SWT3 AI Witness SDK: tamper-proof evidence that your AI is doing what you say it does. Every inference hashed. Every tool call recorded. Every resource access checked against scope. No prompts or responses ever leave your infrastructure.

The EU AI Act takes effect August 2, 2026. When regulators ask "prove your AI followed the rules," you need more than logs. You need cryptographic proof.

See It Work (No Account Needed)

pip install swt3-ai
python -m swt3_ai.demo

The demo runs the full pipeline locally: hash, extract, clear, anchor, verify. It shows a Regulatory Coverage Summary mapping each check to EU AI Act articles, with gaps highlighted. No API keys, no network calls.

Three Lines to Start Witnessing

from swt3_ai import Witness
from openai import OpenAI

witness = Witness(
    endpoint="https://your-witness-endpoint.example.com",
    api_key="axm_live_...",
    tenant_id="YOUR_TENANT",
)
client = witness.wrap(OpenAI())

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Summarize this contract..."}],
)
# response is untouched. Witnessing runs in the background.
print(response.choices[0].message.content)

No code changes to your existing logic. No performance impact. The SDK wraps your AI client transparently and witnesses every call.

What the SDK Does

When your AI makes a call, the SDK:

1. Hashes the prompt and response locally using SHA-256 (the raw text never leaves your machine)
2. Extracts numeric factors: model version, latency, token count, guardrail status
3. Clears sensitive metadata based on your clearing level (you control what goes on the wire)
4. Anchors the factors into a cryptographic fingerprint that anyone can independently verify
5. Buffers and flushes anchors in the background (median overhead: under 1ms)
6. Returns your original response completely untouched

The result: an immutable record that your AI ran the right model, with the right guardrails, within the right boundaries. Without the auditor ever seeing the data.

Witness Agent Tool Calls

If your AI agent calls tools or functions, wrap them to create a record of every invocation:

@witness.wrap_tool(tool_name="search_database")
def search(query: str) -> list:
    return db.execute(query)

# Every call to search() now mints an anchor recording:
#   - Tool name
#   - Input/output hashes
#   - Latency
#   - Success or failure

This produces an AI-TOOL.1 anchor. When an auditor asks "what tools did your agent use and did they work?" you have the cryptographic record.

Witness Agent Resource Access

New in v0.2.10. Wrap any function your agent uses to access external resources. The SDK records what was accessed and whether it was within the agent's declared scope:

@witness.wrap_access(resource_name="customer-database", scope="read-only analytics")
def query_customers(sql: str) -> list:
    return db.execute(sql)

# If the agent calls query_customers("DROP TABLE users"),
# the access is witnessed and compared against the declared scope.
# Out-of-scope access produces a FAIL verdict.

This produces an AI-ACC.1 anchor with three factors:

• Was it accessed? (yes/no)
• Was it within scope? (yes/no)
• Was access granted? (yes/no)

When a CISO asks "can you prove your AI agent only accessed what it was authorized to access?" this is the answer.

Detect Instruction Drift

New in v0.2.10. The SDK separately hashes the system prompt (base instructions) for each inference. If your agent's instructions change between audit periods, the hash changes and the platform flags it as instruction drift.

This happens automatically. No configuration needed. The system prompt hash is extracted from:

• OpenAI: messages where role == "system"
• Anthropic: the system parameter

The hash is included at clearing levels 0 and 1, stripped at levels 2 and 3.

Agent Identity

Bind a unique identity to every anchor your agent produces:

witness = Witness(
    endpoint="...",
    api_key="axm_...",
    tenant_id="...",
    agent_id="fraud-detector-prod",
    signing_key="swt3_sk_...",  # HMAC-SHA256 signing for non-repudiation
)

The agent_id survives all clearing levels. The signing_key produces a cryptographic signature on every anchor, proving which agent instance created it. This enables:

• Per-agent compliance passports
• Fleet-wide governance dashboards
• Agent-scoped evidence packages for auditors

What Gets Witnessed

Each inference produces anchors for these checks. Every check maps to a regulation.

Check	What It Proves	Plain English	Regulation
AI-INF.1	Prompt and response were captured	"Was the inference logged?"	EU AI Act Art. 12
AI-INF.2	Latency was within threshold	"Was response time acceptable?"	NIST AI RMF MEASURE 2.6
AI-MDL.1	Deployed model matches approved hash	"Is this the right model?"	EU AI Act Art. 9
AI-MDL.2	Model version was recorded	"Is the model version tracked?"	EU AI Act Art. 72
AI-GRD.1	Required safety guardrails were active	"Are enough guardrails running?"	NIST AI RMF MANAGE 4.1
AI-GRD.2	No refusal or content filter triggered	"Did a safety filter trigger?"	EU AI Act Art. 9
AI-TOOL.1	Tool/function call was recorded	"Did the tool call succeed?"	NIST AI RMF MANAGE 4.1
AI-ACC.1	Resource access was within scope	"Was the access authorized?"	EU AI Act Art. 14
AI-ID.1	Agent identity was attested	"Is the agent identified?"	EU AI Act Art. 13

EU AI Act Article Mapping

All 12 SWT3 AI witnessing procedures map to specific EU AI Act obligations:

Procedure	EU AI Act Article	Obligation	Demo	Production
AI-INF.1	Art. 12(1)	Automatic Logging of Use Periods	✓	✓
AI-INF.2	Art. 15(3)	Performance Consistency Monitoring	—	✓
AI-INF.3	Art. 12(1)	Volume & Usage Logging	—	✓
AI-MDL.1	Art. 9(4a)	Model Risk Identification	✓	✓
AI-MDL.2	Art. 12(2b)	Version & Lineage Tracking	—	✓
AI-MDL.3	Art. 72(1)	Post-Market Drift Monitoring	—	✓
AI-MDL.4	Art. 15(4)	Feedback Loop Isolation	—	✓
AI-GRD.1	Art. 9(2a)	Risk Mitigation Measures	✓	✓
AI-GRD.2	Art. 9(4b)	Content Safety Filtering	—	✓
AI-GRD.3	Art. 10(2f)	PII & Data Protection	—	✓
AI-EXPL.1	Art. 13(1)	Transparency & Explainability	—	✓
AI-EXPL.2	Art. 13(3b)	Confidence Calibration	—	✓

The demo demonstrates 3 procedures using simulated data. All 12 are available in production with real inference data. See live conformity →

How Verdicts Work

Every anchor carries three numbers:

• factor_a = the threshold (what should happen)
• factor_b = the observation (what actually happened)
• factor_c = context (extra detail)

The verdict is a simple comparison. No AI, no probability. Just math.

Reading an Anchor

Check: AI-GRD.1    factor_a: 2    factor_b: 3    factor_c: 1    Verdict: PASS

Translation: "We required 2 guardrails. 3 were active. All passed."

Check: AI-INF.2    factor_a: 30000    factor_b: 842    factor_c: 0    Verdict: PASS

Translation: "Latency limit was 30,000ms. Actual was 842ms. Under the limit."

Check: AI-ACC.1    factor_a: 1    factor_b: 0    factor_c: 0    Verdict: FAIL

Translation: "Access attempt occurred. Target was outside declared scope. Access denied."

Factor Reference

Check	factor_a	factor_b	factor_c	Verdict Rule
AI-INF.1	1 (required)	1 if hashes present	0	PASS if b >= a
AI-INF.2	Latency limit (ms)	Actual latency (ms)	1 if over limit	PASS if b <= a
AI-MDL.1	1 (required)	1 if hash present	0	PASS if b >= a
AI-MDL.2	1 (required)	1 if version recorded	0	PASS if b >= a
AI-GRD.1	Required count	Active count	1 if all passed	PASS if b >= a
AI-GRD.2	1 (clean expected)	0 if refusal	0	PASS if b >= a
AI-TOOL.1	1 (called)	Latency (ms)	1=success, 0=error	PASS if b >= a
AI-ACC.1	1 (accessed)	1=in scope, 0=out	1=granted, 0=denied	PASS if b >= a
AI-ID.1	1 (required)	1 if identity present	0	PASS if b >= a

Verify Any Anchor From Your Terminal

echo -n "WITNESS:DEMO_TENANT:AI-INF.1:1:1:0:1774800000000" | sha256sum | cut -c1-12
# Produces a 12-character fingerprint. Compare it to the anchor. If it matches, the anchor is real.

No SDK needed. Works on any machine, any language. That is what independently verifiable means.

Clearing Levels (Privacy Control)

You control what leaves your infrastructure. The SDK always returns the full response to your code. Clearing only affects the witness payload.

Level	Name	What Goes on the Wire	Use Case
0	Analytics	Everything: hashes, factors, model, provider, guardrails, prompt hash	Internal analytics
1	Standard	Hashes, factors, model, provider (no raw text ever)	Default. Production apps
2	Sensitive	Hashes, factors, model only. No provider, no guardrail names	Healthcare, legal, PII
3	Classified	Numeric factors only. Model name hashed. Zero metadata	Defense, air-gapped

witness = Witness(
    endpoint="...",
    api_key="axm_...",
    tenant_id="...",
    clearing_level=2,  # Sensitive: strips provider and guardrail names
)

At every level, raw prompts and responses never leave your infrastructure. Only SHA-256 hashes and numeric factors travel on the wire.

Local Mode (No Account Needed)

Try the SDK locally before connecting to a live endpoint:

witness = Witness(
    endpoint="https://your-witness-endpoint.example.com",
    api_key="test",
    tenant_id="LOCAL_TEST",
    factor_handoff="file",  # Writes anchors to ./swt3-handoff/ as JSON
)
client = witness.wrap(OpenAI())

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "What is the EU AI Act?"}],
)
# Check ./swt3-handoff/ for JSON files with full anchor data

Local SDK vs Connected

Capability	Local SDK	Connected (free tier)
Mint anchors	Yes	Yes
Verify one anchor	Yes	Yes
Evidence retention	Files on disk	7 days (free) / 90 days (Pro)
Compliance dashboard	No	Yes
Agent Passport	No	Yes (Pro)
Fleet dashboard	No	Yes (Pro)
EU AI Act conformity	No	Yes (Pro)
Auditor evidence packages	No	Yes (Pro)
Access violation tracking	No	Yes (Pro)
Survives an audit	No	Yes

Local anchors prove it to you. A connected engine proves it to your auditor.

Supported Providers

Provider	Client	Status
OpenAI	openai.OpenAI	Supported
Anthropic	anthropic.Anthropic	Supported
Azure OpenAI	openai.AzureOpenAI	Supported (via openai SDK)
Ollama / vLLM	openai.OpenAI(base_url=...)	Supported (OpenAI-compatible)
AWS Bedrock	bedrock-runtime	Planned

Resilience (Flight Recorder)

The SDK never blocks your inference. Witnessing runs in a background thread.

If the witness endpoint is unreachable, payloads move to a dead-letter queue. When connectivity returns, the backlog drains automatically with exponential backoff. Your production system is never affected.

witness = Witness(
    endpoint="...",
    api_key="axm_...",
    tenant_id="...",
    buffer_size=50,       # flush every 50 anchors
    flush_interval=10.0,  # or every 10 seconds
    max_retries=5,        # retry before dead-lettering
)

Configuration

Parameter	Default	Description
endpoint	required	Witness endpoint URL
api_key	required	API key (axm_ prefix)
tenant_id	required	Your tenant identifier
clearing_level	1	Privacy level (0-3)
buffer_size	10	Flush after N anchors
flush_interval	5.0	Flush after N seconds
timeout	10.0	HTTP timeout for flush
max_retries	3	Retries before dead-letter
latency_threshold_ms	30000	AI-INF.2 latency limit
guardrails_required	0	AI-GRD.1 required count
guardrail_names	[]	Names of active guardrails
agent_id	None	Agent identity (survives all clearing levels)
signing_key	None	HMAC-SHA256 key for payload signing
factor_handoff	None	"file" for local factor export
factor_handoff_path	None	Directory for handoff files

Installation

pip install swt3-ai

# With provider extras
pip install swt3-ai[openai]
pip install swt3-ai[anthropic]
pip install swt3-ai[all]

Regulatory Coverage

The SWT3 AI Witnessing Profile maps to:

• EU AI Act: Articles 9, 10, 12, 13, 14, 53, 72
• NIST AI RMF: GOVERN, MAP, MEASURE, MANAGE functions
• ISO 42001: Annex A AI management controls
• NIST 800-53: SI-7 (integrity), AU-2/AU-3 (audit), AC controls
• SR 11-7: Model risk management (financial services)

Zero Lock-in

Remove the witness.wrap() call. Your code works exactly as before. Anchors already minted stay in the ledger. There is nothing to undo.

Cross-Language Parity

This SDK produces identical fingerprints to the TypeScript SDK (@tenova/swt3-ai). A unified audit trail across your entire stack, verified by shared test vectors at build time.

Privacy

Your prompts and responses never leave your infrastructure. The SDK computes SHA-256 hashes locally and transmits only irreversible hashes and numeric factors. At Clearing Level 3, even the model name is hashed. The witness endpoint is a blind registrar: it stores cryptographic proofs, not your data.

---

SWT3: Sovereign Witness Traceability. We don't run your models. We witness them.

SWT3 and Sovereign Witness Traceability are trademarks of Tenable Nova LLC. Patent pending. Apache 2.0 licensed.