The Bitcoin whitepaper is a document published in 2008 by an unknown person or group using the pseudonym Satoshi Nakamoto. Titled "Bitcoin: A Peer-to-Peer Electronic Cash System," the whitepaper introduced the concept of Bitcoin, the first decentralized cryptocurrency. It outlined the idea of using a decentralized network, proof of work, cryptographic signatures, and a limited supply to enable secure and direct peer-to-peer transactions without intermediaries like banks. The whitepaper's ideas revolutionized the financial and technological landscape, giving rise to the cryptocurrency and blockchain movement.