How did an anonymous white paper turn into money nobody controls?

Bitcoin became money nobody controls because of the way it keeps its books: each participating computer holds its own copy of a public ledger of every transaction, with no central authority in charge, and cryptography stops anyone from spending someone else's coins as long as the owner keeps certain secret data to themselves. That design came from a white paper titled Bitcoin: A Peer-to-Peer Electronic Cash System, whose link appeared on a cryptography mailing list on 31 October 2008 under the pseudonym Satoshi Nakamoto. To this day, Nakamoto's real identity remains unknown.

What made the paper different wasn't any single new idea. People had tried to build digital cash before, and each attempt failed for its own reason: one required centralized control that no bank would sign up for, another had no protection against double-spending, and others were vulnerable to networks full of fake identities. According to computer scientist Arvind Narayanan, all of bitcoin's components already existed in earlier academic literature; Nakamoto's innovation was how they fit together, into the first decentralized, Sybil-resistant, Byzantine-fault-tolerant digital cash system, what would later be called the first blockchain.

The idea went from paper to working network fast. On 3 January 2009, Nakamoto mined the very first block of the chain, the genesis block, embedding inside it the date and headline of that day's Times newspaper, about a second bailout for banks, now written permanently into the ledger. Nine days later, programmer Hal Finney received the first bitcoin transaction ever sent: ten coins, straight from Nakamoto.

For well over a year, there was no known purchase paid in bitcoin. That changed on 22 May 2010, when programmer Laszlo Hanyecz paid 10,000 bitcoins for two Papa John's pizzas, the first known commercial transaction using bitcoin, later celebrated as Bitcoin Pizza Day. By the time Nakamoto stepped away from the project later that same year, handing control of the code to developer Gavin Andresen, analysts estimate Nakamoto had already mined around one million bitcoins.