^^ This one, specially Wei Dai's b-money.
You can also read email correspondence between the two here,
Wei Dai/Satoshi Nakamoto 2009 Bitcoin emails.
So obviously, Satoshi just take it to the next level and was very successful as compare to its predecessors.
Mr. Dai is one of the most mysterious people behind Bitcoin. His lack of public appearances has lead some to speculate he might actually be (maybe part of) the personality behind satoshi.
His Wikipedia article reveals he's a
bachelor of Science degree from the University of Washington in computer science, with a minor in mathematics. while from there we can see he was also quoted saying when asked about b-money's connection with bitcoin. :
...my understanding is that the creator of Bitcoin, who goes by the name Satoshi Nakamoto, didn't even read my article before reinventing the idea himself. He learned about it afterward and credited me in his paper. So my connection with the project is quite limited.
(Source) It just fascinates me how this person fell out of the spotlight so much while others that received a mention by satoshi are taking advantage of titles like "founding fathers of bitcoin". And I'm not trying to discredit anyone, their work is of the utmost excellence, but to contrast the difference:
Adam Back is the founder and CEO of blockcstream, being a keynote speaker at conferences and promoting products and services from his company.
Scott Stornetta appears in crypto-related conferences representing Yugen Partners
Stuart Haber is still involved with developing and promoting commercial solutions related to blockchain after the blockchain boom.
Honorable mention although not mentioned in bitcoin's whitepaper, David Chaum, often referred to as the inventor of of e-cash, has made a comeback to crypto with his new venture: Praxxis.
In my own personal opinion, those early pioneers deserve all the attention they get thanks to the cryptocurrency and blockchain boom, but all that begs for an answer to the question, where's Mr. Dai? He appears to be active online still, but it's curious that we can't find him actively promoting any ambitious commercial ventures or research projects in the last few years. Pictures of him aren't even turning up when searching his name! He can't be found to be have been associated with any marketing efforts for a project ever since he created b-cash. His website lists mercatoria.io as a company he's
involved with, with the description
project to create an arbitrarily scalable blockchain. The website of that project doesn't appear to load currently.
Only a single archived page of it from November 2018 comes up on archive.org saying "coming soon". His last published paper on
Google scholar is on 2009.
To me, it's also commendable if a much sought after person seeks to remain out of the spotlight. But seeing as to how much success people mentioned in bitcoin's whitepaper are finding themselves to be met with, I'd think that Mr. Dai would also be the receiver of myriads of request to join companies, advise projects, co-author papers, assist research projects etc. Why is it then that he's staying out of the spotlight to such an extent? Curious nevertheless.