Proof for every AI call

Bad advice? Prove exactly what was said.

Proof for every API

OpenAI. Anthropic. Stripe. Any endpoint.

Evidence, not logs

Hash-chained. Immutable. Verifiable.

Court-ready records

Cryptographic proof that holds up.

curl -sf https://skylon.ai/install | sh macOS, Linux, WSL. Single binary. Free for local use. 
$ skylon start --upstream=api.openai.com
proxy:    localhost:8080 -> api.openai.com
evidence: ./skylon.log

$ skylon verify
142 records verified. Chain intact.

How it works

1
RecordEvery request and response captured. Full payloads, headers, timestamps.
2
ChainSHA-256 links each record to the previous. Edit anything, the chain breaks.
3
WitnessOptional cloud attestation. We store just the hash. You can't backdate.

When you need it

Legal discovery

Chatbot gave bad advice? Prove the exact exchange in court.

Compliance

SOC 2, GDPR, EU AI Act. Prove what data went where.

Debugging

Model hallucinated? Replay the exact request. Prove it.

Your data stays yours

Local

Full payloads in skylon.log

Prompts, completions, tokens. Your machine.

Cloud witness

32 bytes: hash + seq + ts

We see only the hash. Can't read your data.

Pricing

Starter

$0

  • 10k attestations/month
  • Local evidence chain
  • Cloud witness
  • One API key

Scale

$0.001/attestation

  • Unlimited volume
  • Priority witness
  • Team API keys
  • Usage analytics