Finney was a cypherpunk and said:
It seemed so obvious to me: "Here we are faced with the problems of loss of privacy, creeping computerization, massive databases, more centralization - and [David] Chaum offers a completely different direction to go in, one which puts power into the hands of individuals rather than governments and corporations. The computer can be used as a tool to liberate and protect people, rather than to control them."
He was an early Bitcoin user and received the first bitcoin transaction from Bitcoin's creator Satoshi Nakamoto. Finney lived in the same town for 10 years that Dorian Satoshi Nakamoto lived (Temple City, California), adding to speculation that he may have been Bitcoin's creator.[10] Finney denied that he was Satoshi Nakamoto.
He also lived a few blocks from a man named Dorian Nakamoto, according to Forbes journalist Andy Greenberg.[30] Greenberg asked the writing analysis consultancy Juola & Associates to compare a sample of Finney's writing to Satoshi Nakamoto's, and they found that it was the closest resemblance they had yet come across (including the candidates suggested by Newsweek, Fast Company, The New Yorker, Ted Nelson and Skye Grey).[30] Greenberg theorized that Finney may have been a ghostwriter on behalf of Nakamoto, or that he simply used his neighbor Dorian's identity as a "drop" or "patsy whose personal information is used to hide online exploits". However, after meeting Finney, seeing the emails between him and Nakamoto and his bitcoin wallet's history (including the very first bitcoin transaction from Nakamoto to him, which he forgot to pay back) and hearing his denial, Greenberg concluded that Finney was telling the truth. Juola & Associates also found that Nakamoto's emails to Finney more closely resemble Nakamoto's other writings than Finney's do.
In a May 2011 article, Szabo stated about the bitcoin creator: "Myself, Wei Dai, and Hal Finney were the only people I know of who liked the idea (or in Dai's case his related idea) enough to pursue it to any significant extent until Nakamoto (assuming Nakamoto is not really Finney or Dai).During the last year of his life, the Finneys received anonymous calls demanding an extortion fee of 1,000 bitcoin. They became victims of swatting – a hoax "where the perpetrator calls up emergency dispatch using a spoofed telephone number and pretends to have committed a heinous crime in the hopes of provoking an armed police response to the victim's home".[11] Extortionists have demanded fees of more bitcoins than Finney had left after using the majority of them to cover medical expenses in 2013.
https://en.wikipedia.org/wiki/Hal_Finney_(computer_scientist)
https://en.wikipedia.org/wiki/Satoshi_Nakamoto#Dorian_NakamotoMy conclusion
Hal Finney = Satoshi Nakamoto = Szabo + Wei Dai
Double spending was written by Hal Finney