In sufficiently corrupt countries they don't even have to disappear, they just can be either ignored easily or proclaimed illegitimate. A blockchain record saying you own something means nothing in countries where these are not legally recognized and I don't know any where they are (but Estonia, perhaps) and especially in corrupt countries where police and judges do whatever they are told by particular people rather than the law, the evidence or whatever. Also, a person can just come and beat the secret key out of you and submit whatever transactions he wants to the actual blockchain in countries like that.