The best part: No fees! If a computer is the first to solve a hash, they store newly-made transactions as a block on the blockchain, at which point they become unalterable. While most exchanges offer wallets for their users, security is not their primary business. Bitcoin is just a small piece of what they do. The biggest downsides of CoinExchange are a lack of mobile apps, lower trading volume than some other platforms and vague security policies. Is Bitcoin Anonymous?