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We are far from the situation where there is a compulsory, Legal Tender blockchain currency. I doubt even if they do pass such laws that it will stop the 'black market' in crypto money. All the ways to try and stop it are able to be bypassed. It's much too easy to make the traffic look like 'legal' traffic types, if you have to conceal it. Blockchain chatter is literally called 'gossip' by the way :)