Bitcoin is the most secure and robust cryptocurrency in the world, created in 2008 by an unknown person or persons by the name of Satoshi Nakamoto. Unlike fiat currencies, Bitcoin is a decentralized currency. That means that a network of users control and verify transactions instead of a central authority like a bank or a government. When Bitcoin is exchanged, the record of the transaction is publicly recorded onto a ledger known as the blockchain, which other Bitcoin users, known as miners, verify by putting those transactions into a block and adding it to the blockchain after Proof of Work (PoW). The maximum amount of bitcoins that can ever be created is capped at 21 million, and the creation rate is halved every four years.