I am a researcher on decentralised digital currency over 30 years. There was no concept of Decentralised Electronic  curgency, Proof of Work or Blockchain at all.

I was conducting exclusive research on Decentralized Electronic Currency since 1988. Eearly 1993, I designed an electronic Euro Bond but I was not able to lunch it. In 1994 I created a single currency project for South Asian Economic Zone but my project was hijacked from me by EU Financial Intelevent Unit.  Later, the EU successfully launched the European Single  currency Euro. Then I moved on to another project in African Continent call Rica. It was difficult because African central banking system.

Finally, in 2005 I wrote the Electronic Digital  Currency Protocol, which actually was my thesis. In january 2006, I created Bitgold project. Later, in October 2006 I transformed it into  Bitcoin Project. I invented Blockchain in March 2007 and wrote the Bitcoin White Paper and Blockchain Transaction Paper on 5 April 2007.

In May 2007, I was looking on the Internet if any one doing any project on Digital Currency. After a good search, I found Adam Back Hash Cash, which is nothing to do with Digital Currency. Then I found Wei Dai's B-Money which was not very much clear. Then I found Nick Szabo's Bit-Gold, which didn't make any sense. There after I found David Chaum's Digi Cash but it was not about Digital Money but it was just a form of Gold Certificate.

Well, there was no concept of Blockchain Technology any where before 2007. And you all think, Satoshi Nakamoto Created Bitcoin Bitcoin and Blockchain but literally, Satoshi Nakamoto is one of my Japanese pseudonym. I used it just to lunched the Bitcoin project.

Well David Chaum is a great man who tried to trade gold certificate as Digi Cash but he has to go to prison. It was his failure to develop something better. I have no problem if some one proposes to respect Dr Chaum. Indeed, when I read that he has to go prison for the Gold Certificate the Digi Cash, so it really inspired me to publish the Bitcoin in my JAPANESE pseudonym Satoshi Nakamoto, also there was other reason for it.