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Bitcoin has been on a roller coaster ride this year. It's also seen its value drop from a high of $17,000 to less than $7,000 this year. Are you thinking about buying some Bitcoin? Or are you wondering whether to hold onto the Bitcoin you already have? Here are some of the most important things you should know before investing in Bitcoin. Bitcoin is a cryptocurrency that was created in 2009 by an unknown person or people using the alias Satoshi Nakamoto. The system operates using a peer-to-peer network and a public ledger called blockchain that records all transactions which take place on the network. Bitcoins can be traded for goods and services with vendors who accept them as payment, they can also be exchanged for other currencies such as US dollars.