Fill in your name, email, password, and location. And while Coinbase is headquartered in America, their payment processor runs through the UK, so your card may be hit with an additional foreign purchase fee, depending on your card and where you live. In this guide we will cover purchasing with a debit card or with a bank account. Coinbase has a knowledge base and email support. Its multi-sig vault is a 2 of 3 wallet, where Coinbase has one key, one key is shared, and the third key is held by the account holder.