I built a black box recorder for AI systems – CEL v0.2 Pro

Source: Dev.to

The problem

Modern AI agents make decisions, call tools, and run complex pipelines — but their logs are mutable JSON files. You can’t prove what actually happened.

CEL (Colchis Execution Log) is a cryptographically verifiable execution log for AI systems. Every event is recorded as a SHA‑256 hash‑chained binary frame. Any tampering breaks the chain immediately. Think Git — but for AI execution history.

python3 cli.py proof mylog.log
python3 cli.py verify-proof mylog.log mylog.log.proof.json
# → ✅ Proof VALID

Share one file to prove your AI ran exactly this way — independently verifiable by third parties.

Features

• ✅ SHA‑256 hash chain — tamper‑evident
• ✅ Execution Proof generator
• ✅ CLI tool (init, append, verify, dump, export, proof)
• ✅ Web interface (Flask)
• ✅ Export to CSV and PDF
• ✅ Compliance‑ready — EU AI Act, GDPR, HIPAA
• ✅ Zero cloud dependency — works fully offline

Links

• GitHub:
• CEL Pro ($99):