Bitcoin whitepaper

Released by Satoshi Nakamoto on the early mailing list discussions where Bitcoin was announced.

Reuploaded into the blockchain itself: bitcoin.stackexchange.com/questions/35959/how-is-the-whitepaper-decoded-from-the-blockchain-tx-with-1000x-m-of-n-multisi/105574#105574 by using the Satoshi uploader.

More conveniently available at: bitcoin.org/bitcoin.pdf nowadays.