Hi Lyn, I think about this topics quite some time. And I think they don't have to go door to door. In todays interconnected world for example crypto exchanges can correspond with financial institutions and vice versa. Just a scenario: In most european contries your tax id is linked to your exchange account. To make it easy for itself as the ministry of finance they just impose a 100 % tax on bitcoin with your next tax assesment notice. And then go on from there. It will force people out of there position. Is this a potential risk in you opinion regarding a nation state ban? 

 Bitcoin doesn't need exchanges to work.

They took the gold in most bank vaults, but not buried, hidden gold.