Bitcoins are not anonymous, they are pseudonymous. It works, by announcing a transaction from one of your accounts ( defined by public and private key) to anoth

Bitcoins are not anonymous, they are pseudonymous. It works, by announcing a transaction from one of your accounts ( defined by public and private key) to another account. So if you can keep your Bitcoin address separate from yourself, then you are anonymous. But there is nothing in Bitcoins which protects the identity of your address. In fact the entire point about the Bitcoin protocol is, that there is a method to find a consensus of the contents of each individual address.