Skylock is the trust layer for Counter-UAS. Every drone-detection product on the market answers one question: is there a drone? Skylock answers a different one: was this defensible? Each detection produces a signed, hash-chained GroundTruth Receipt — the same evidence shape a JAG officer would accept in a use-of-force review. Skylock fuses acoustic, optical, RF Remote ID, and IMU votes through SCI v1: a seven-component custody-inference algorithm that feeds a deterministic seven-state state machine. A Trust Gate verifies the model engine’s SHA256 against a signed passport before every inference. If the model is tampered with, Skylock does not fail silently. It still produces a signed receipt, but trust is automatically adjusted and the audit chain logs the gate trip. A Decoy Verifier uses parallax and temporal motion checks to catch printed-photo and replayed-video spoofs. The operator console runs in any browser — laptop, phone, wall display, or offline tablet. The NodePack runs on-device only: Jetson Orin Nano, with YOLO11n FP16 inference at roughly six milliseconds. There is no fire-control API. No kinetic verbs anywhere. Skylock signals. The commander decides. ARGUS chat answers questions like, why did this escalate, with citations to specific signed receipts. Maven AIP Ontology integration is designed. ATAK, Slack, Teams, Bland AI, and Foundry payloads are previewable today and go live by setting one environment variable. Public GitHub repository: https://github.com/Sidra/skylock-hack
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