The latest articles on DEV Community by Giorgi Ghurtskaia (@ghurtsky). https://dev.to/ghurtsky https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3815327%2Ff3bda911-0301-46ee-95e5-ea538027f0a6.jpeg https://dev.to/ghurtsky en Giorgi Ghurtskaia Wed, 18 Mar 2026 07:20:04 +0000 https://dev.to/ghurtsky/i-built-a-black-box-recorder-for-ai-systems-cel-v02-pro-3875 https://dev.to/ghurtsky/i-built-a-black-box-recorder-for-ai-systems-cel-v02-pro-3875 <h2> The problem </h2> <p>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.</p> <h2> What is CEL? </h2> <p>CEL (Colchis Execution Log) is a cryptographically verifiable execution log for AI systems.</p> <p>Every event is recorded as a <strong>SHA-256 hash-chained binary frame</strong>. Any tampering breaks the chain immediately.</p> <p>Think Git — but for AI execution history.</p> <h2> New in v0.2: Execution Proof </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> bash 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: https://github.com/GhurtSky-GR13/colchis-log CEL Pro ($99): https://ko-fi.com/s/50fccfeecd </code></pre> </div> ai python security opensource