RE: What are the side chain settlement solutions?private vs. publicBlockstream = Lightning Network 'private' side chains for the BTC big boys.
LoLz
It works until one of the partners screws up on settlement.
But already there are operating ALTs that can function as 'Lightning' forms of settlement and clearing houses just unwind/trade back to bitcoin positions as they please (in 45min-12hr windows) .... you know at bitcoin confirmation speed.
XRP is designed to do this. But seems to have forgotten.
DASH could do it.
STELLAR is better designed to do this.
BTS, NXT, XCP, PeerGroup, and XEM can create 'pegged' assets to do this.
NuShare and Omni already have 'pegs' that appear to work.
A wide array of ALTs can collectively serve to do this ... all in the open public market arena.