central bank. it's a software system that mimics what cash does in the physical world. every bit coin bought and sold is recorded in an open ledger, constantly updated across other every participating program in a spreadsheet maintained by its users called the block chain. as for whether or not you should buy it, most experts say not without a strong stomach. >> bit coin is as safe as you can make it. there are elements that make it extremely safe and transparent, but there are also issues about it. there's a lot more to you as the user to secure your bit coin then if you went to your bank and you have your dollars. the bank is responsible for all your money. you are responsible for your bit claim. there are elements that make it more secure but there's also a lot more responsibility put on the user to ensure that. >> there are few vendors that accept bit coin in exchange for physical good such as ebola french onion soup.