If you're building a platform where users interact — a game, a community forum, a messaging app, an educational tool — child safety compliance is not optional. The EU DSA, UK Online Safety Act, and NCMEC mandatory reporting obligations all apply based on your user base, not your company size or headcount. SENTINEL ( https://github.com/sentinel-safety/SENTINEL ) is an open-source behavioral intelligence platform that handles the full compliance stack: behavioral detection, perceptual hash matching, evidence preservation, and CyberTipline report generation. This guide walks through getting it running on your infrastructure. Prerequisites: Docker, Docker Compose, 4GB RAM, a Linux or macOS host. Everything runs locally — no data leaves your infrastructure. Step 1: Clone and Configure (5 minutes) git clone https://github.com/sentinel-safety/SENTINEL.git cd SENTINEL cp .env.example .env Enter fullscreen mode Exit fullscreen mode Edit .env with your platform's configuration.…