Cryptographic currency exchange

A method of transacting cryptographic currency at a host computer system, comprising:

• maintaining an exchange database associated with a plurality of buyers and a plurality of sellers;
• creating a match within the exchange database, wherein the match comprises a buy offer for the cryptographic currency from a buyer of the plurality of buyers and a sell offer for the cryptographic currency from a seller of the plurality of sellers;
• receiving a cryptographic currency withdrawal request from the buyer;
• in response to receiving the cryptographic currency withdrawal request:
• determining that a total amount of cryptographic currency represented in the exchange database matches a total amount of the cryptographic currency within an exchange wallet associated with the exchange database;
• facilitating transfer of the cryptographic currency from the exchange wallet to a buyer wallet associated with the buyer;
• and
• updating the exchange database by deducting a first value of the cryptographic currency that is transferred to the buyer wallet.