The author is an active Sweatcoin user and believes that Sweatcoin will provide benefit to thousands of people around the world. It is the use of cryptography that makes it very hard to trace the buyers or sellers using bitcoin. We bought fractions of a bitcoin ourselves at first to get used to the environment and understand how the whole buying process worked. You may also like. It is a personal decision that you must make for yourself based on your risk tolerance and what you can afford. This system is maintained by a network of computers around the world. People split up Bitcoin into hundreds of separate smaller portions for anonymity.