YouTube: blockchain
https://youtube.com/watch?v=jgOZdnpEDts
cryptocurrency qu’est ce que – qu’est ce que la technologie blockchain
You can start practise here – https://goo.gl/tVnuPB.
YouTube: ethereum
https://youtube.com/watch?v=_Hi9Uia-ku8
Watch What Is Ethereum? A Simple Explanation Anyone Can Understand – Ethereum Money
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