If I want to start a Plasma side chain for a project, do I need my own blockchain for it (with X amount of nodes etc) or is it run simply by those who participate in it?
If it’s run solely by its participants I fail to understand how they can reach consensus with any degree of credibility. If for example only two nodes participate, how can they reach consensus?
Also, who decides on the side chain’s details, such as consensus protocol? Is it the first node who joins/creates it?