> The exchanges. Without controlling all of the exchanges, including the anonymous ones, and track every other alt-coin blockchain, and every miner that has ev

> The exchanges. Without controlling all of the exchanges, including the anonymous ones, and track every other alt-coin blockchain, and every miner that has ever produced a coin in one of those blockchains, including the ones that are specifically designed to be impossible to track, you have nothing. More the point, everyone who has chosen to actually validate this for themselves knows this already. You're raising points that were some of the talking points in crypto about four years ago. Indeed many of these points have already had specific implementations that exist now to counteract any possibility of a potential weak point for the things you're hypothesizing. With the implementation of "atomic swaps" and lightning this will further make control of the type you envisage even more impossible to do. And for all intents and purposes, it's impossible to do now.