A reliable exchange is one that will not let customers register to its service without a minimum of KYC (Know Your Customer) measures. To prevent money laundering and other illegal financial operations, an exchange should verify customers identity and be able to research their financial background by asking them to submit 2 or more pieces of identification. Due diligence should be done by the exchange not only on the customers but also on the coin they list. If an exchange lists scam coins or coins that are not known as reliable, it may be a sign that the exchange may not be truly trustable.