From a technical point of view, bitcoins can be cut into very small parts. Most exchanges will allow you to buy a fraction of a coin. It is often even possible to own a single satoshi. The satoshi is currently the smallest unit of the bitcoin currency recorded on the blockchain. It’s a hundred millionth of a single bitcoin (0.00000001 BTC). The unit was named in collective tribute to the original creator of Bitcoin, Satoshi Nakamoto.