Moxie was brought on as a contractor at WhatsApp iirc, the code wasn't just purchased. While WhatsApp uses the same cryptographic architecture its likely they d

Moxie was brought on as a contractor at WhatsApp iirc, the code wasn't just purchased. While WhatsApp uses the same cryptographic architecture its likely they didn't just drop in libsignal (as libsignal is set up to tie into Signal's servers, rather than just be an encryption library like OMEMO or olm). If your looking to build software that integrates with Signal, then libsignal is great (having built a few things with it).