Pocgate is a security tool that verifies whether a patch actually fixes a vulnerability by creating a reproducible execution evidence. It generates an "evidence.json" file that can be used to rederive the same conclusion on different machines, without requiring network access, binaries, or model tuning. This tool addresses a common issue where a patch may pass review but still contain a vulnerability, as demonstrated by three scenarios: the proof-of-concept (PoC) may not trigger due to incorrect entry selection or build failure, leading to a false sense of security. Pocgate's reproducible execution evidence helps ensure that patches are effective by providing a reliable way to verify the fix.