To answer to your question, I think your points have already been raised and while I may even share them BIP70 is by default using SSL and X.509 and it seems natural to use it for extensions too.
Other than that, instant confirmation is also done via our own API (which is via wss, ssl) and there is no reason as to why it couldn't be done with ECDSA instead, issue as usual is key management.
You think arbitrage&liquidity between exchanges via instant confirmation is not well suited for exchanges?
Other than that, instant confirmation is also done via our own API (which is via wss, ssl) and there is no reason as to why it couldn't be done with ECDSA instead, issue as usual is key management.
You think arbitrage&liquidity between exchanges via instant confirmation is not well suited for exchanges?