can you link to the post that claims the protocol is not open? I’m interested in looking into that
anyway, source for the magic wormhole can be found here: https://github.com/magic-wormhole/magic-wormhole which also links to both the Mailbox code and the Transit Relay code.
ah yes, that, wormhole.app, that is closed source. (but if I am reading this correctly, some early iteration of it is open source. https://github.com/saljam/webwormhole )
Magic wormhole is a different thing.