A fun fact when learning the history of Bitcoin is the ‘pre-release’ of the whitepaper, the text below is from this link.
Prior to the release of the Bitcoin whitepaper on October 31, 2008, Satoshi sent out a draft to Wei Dai. The emails they exchanged are archived here : https://www.gwern.net/docs/2008-nakamoto
Title: Electronic Cash Without a Trusted Third Party Abstract: A purely peer-to-peer version of electronic cash would allow online payments to be sent directly from one party to another without the burdens of going through a financial institution. Digital signatures offer part of the solution, but the main benefits are lost if a trusted party is still required to prevent double-spending. We propose a solution to the double-spending problem using a peer-to-peer network. The network timestamps transactions by hashing them into an ongoing chain of hash-based proof-of-work, forming a record that cannot be changed without redoing the proof-of-work. The longest chain not only serves as proof of the sequence of events witnessed, but proof that it came from the largest pool of CPU power. As long as honest nodes control the most CPU power on the network, they can generate the longest chain and outpace any attackers. The network itself requires minimal structure. Messages are broadcasted on a best effort basis, and nodes can leave and rejoin the network at will, accepting the longest proof-of-work chain as proof of what happened while they were gone.