EU AI Act Article 12 mandates per-event logging for high-risk AI, retained 6+ months. High-risk rules apply Dec 2, 2027 (2026 Digital Omnibus), but the log is architectural: you capture each decision as it happens, you can't backfill it. Praxa records every AI decision into a tamper-evident SHA-256 hash chain. Free playground at praxa.piposlab.com/playground lets you tamper a chain in 5s. Verify with @piposlabs/praxa-verify on npm (MIT, zero deps). Free up to 10k decisions/mo, $79 for 100k.
