On p. 7 they write:
By the time he released the paper, he had already coded the entire system. In his own words, “I had to write all the code before I could convince myself that I could solve every problem, then I wrote the paper.” Based on historical estimates, Satoshi likely started formalizing the Bitcoin concept sometime in late 2006 and started coding around May 2007.
Worth pointing out that Hal Finney and Ray Dillinger — and likely several others – helped audit the code and paper before any of it was publicly released.
Book Review:
Cryptoassets
by Chris Burniske and Jack Tatar.
Posted on July 17, 2018
https://www.ofnumbers.com/category/bitcoin/Cryptoassets: The Innovative Investor's Guide to Bitcoin and Beyond (Inglés) Pasta dura – octubre 19, 2017
by Chris Burniske and Jack Tatar.
https://www.amazon.com/Cryptoassets-Innovative-Investors-Bitcoin-Beyond/dp/1260026671