Register a new account. Sign up for a user account to start buying or selling bitcoins. Username*. Email*. Password*. Password (again)*. Registration on btccashwiki.com How do I register as a user at btccashwiki.com? Why is my password not accepted during the registration? Why don´t I receive the. Send, receive and securely store your Bitcoin and Bitcoin Cash. btccashwiki.com wallet is available on web, iOS and Android.