 Okay, thank you. So, in very few minutes, I will explain the long story of blockchain. Well, the beginning of the story is in 1989 when I was working at Philips. I don't have time to explain, but we did. And we did also water marking and so on. It was with Belgian notaries. The problem at that time, lack of good hash function because MD4, MD5 were coming after that work. Okay, the true inventor is here, is Stuart Aber, sorry. He published with Tornetta first at Crypto 90, 27 years ago, all to timestamp a digital document. There was also a patent. There were two views. One was centralized and the other one, they centralized with consensus and with using a random generator using cryptography. So nearly everything basically. Next one was yours Ben Hallow there, the year after about efficient broadcast and stamping for voting application. So there are people today putting voting of the Bitcoin using the blockchain and so on. They have to come better and before here. Okay, so here is the paper, the patents. There was also an early proof of work. The Chinese slaughter presented here long time ago by Ivo de Smetard myself. And then there was the TimeSec project. Here is the project. It was in Belgium with Bart Promeuil and me in 1996. Well, I don't have time. It was with the support of Stuart Aber and we did that with two servers. We used two hash functions in parallel, metal things, accumulators. There is a trace of that at Iso and we proposed at ATF, the Internet ATF, the use of blockchain in 1997. It was not accepted because people didn't understand. Okay, so you have the reference here, no time. Also, in the cloud vision of the paper we published 10 to years ago, all the questions you know, scalability, granularity and so on are already there. There was also a paper not well known by somebody from the bank of Japan, UNI. And there the question of Bitcoin is set here in the report, except that the report is in 2001. It was the author, Masachi and Matsumoto. The Bitcoin is the author is Satoshi Nakamoto. So you see the coincidence. And in the reference there are Satoshi also. So your conclusion is not mine. And Masachi, you know, is working about experimental economy, research subject to cryptography and distributed chaining. Okay, thing about the paper of Satoshi Nakamoto, the inventor of Bitcoin know very well the story I'm going to give you or the eight reference, five reference at about Aber, Merkel and me. Here is the reference of Satoshi, you see me, Aber, Aber, Aber. Okay, where it was invented so early and not used. Good question. People did the thing that was important, did understand the concept of distributed computation that is peer-to-peer, and then went to a bit around, and Bitcoin was coming, and so on. If you want to read the paper, because the paper it is written here, the blockchain engineering, there are 20 projects there and it was published in July last month. Thank you very much.