Your AI agents make thousands of calls but can you prove what they said? AIR Blackbox is an open-source reverse proxy that records every LLM call with HMAC-SHA256 chaining. If anyone tampers with a record, the chain breaks instantly. Unlike observability tools, AIR focuses on provability: - Cryptographic audit chain for tamper-proof integrity - EU AI Act compliance (Articles 9-15) - PII detection and prompt injection scanning - Shadow AI detection via model registry pip install air-blackbox