Bitcoin is the world’s first and biggest decentralized digital currency, the complete opposite of physical cash. Created back in 2008, Bitcoin (BTC) allows direct peer to peer (P2P) payments and excludes intermediaries like banks from the process, making it completely decentralized.
Bitcoin is as well the largest cryptocurrency by market capitalization. It reached its all-time high price of $20.089 in December 2017. BTC is an asset of a limited 21 million supply. It is based on a Proof of Work (PoW) consensus algorithm, thus can be mined by various hardware, including ASIC. Bitcoin went through its third halving process (that happens every four years) in May 2020 and currently offers a 6.25 BTC reward for mining a block.