Do not use Coinbase! They have extremely poor service and will not support you if you ever encounter issues logging in. Instead, they will write a generic response to your ticket and immediately close it. If any major bank tried to pull this they would get buried in lawsuits.
Again, avoid this service at all costs. Forget their greedy 5% fees on deposits/withdrawals - it doesn't even matter if you can't get your BTC or USD back period. That's a 100% fee.
For related legal issues from regulations issued by the government or the bank, I don't know. Here you cannot log in due to a problem, indeed in coinbase if you cannot login because it is wrong or forget the key, so it is very difficult to restore your account, but if it is because of something other than that I have never tried it.