OTR has some major shortcomings - in the classic implementation, it doesn't do group chat and it requires both parties to be online at the same time to synchron

OTR has some major shortcomings - in the classic implementation, it doesn't do group chat and it requires both parties to be online at the same time to synchronise the cryptographic ratchet. The best explanation of why Axolotl is better is https://whispersystems.org/blog/advanced-ratcheting https://whispersystems.org/blog/advanced-ratcheting - or if you prefer a more comprehensive spec, we've published one at https://matrix.org/docs/spec/olm.html https://matrix.org/docs/spec/olm.html. Anyone wanting to know more about Olm & Matrix's Axolotl support might be interested to flip to the end of https://matrix.org/~matthew/2015-06-26%20Matrix%20Jardin%20Entropique.pdf https://matrix.org/~matthew/2015-06-26%20Matrix%20Jardin%20E... (p.s. hi!)