Before Forb Wallets must be encrypted so anyone withdrawing bitcoins from your account must know a password. There are many different types of bitcoin-based wallets and you need to be very careful to choose something that will best meet your needs. I cover fintech, cryptocurrencies, blockchain and investing at Forbes. Each share represents about one-tenth of a bitcoin. There are other ways to purchase bitcoins; some more exotic than others. Many wallets offer two-factor authentication, where a unique code is texted or emailed to you before withdrawals can be made.