Real-time multiplayer: Which Box2D implementation is used in Cocos Creator?

I’m creating a real-time multiplayer game and need to run the physics engine on the server (unless there is a graceful way to run cocos without rendering on the server, which might be preferable). I read somewhere that cocos creator is using Box2D under the hood, but there appear to be a couple implementations and I want to make sure the version is the same as what’s running client-side. Anyone know where to get this info or how to run cocos server-side without rendering (and other client-only stuff)?

Bump. Someone must know…