Andreas Antonopoulos is a well-know commentator and author in the cryptocurrencies space. He is nothing short of brilliant and a very good speaker (and I've seen many speakers in my work!). Do a Google search on him and watch some of his YouTube videos. You'll be glad you did. I believe he was born in Greece and lived there for many years. Now he travels around the world speaking about Bitcoin and cryptocurrencies.
Let me know what you think tikotiko when you get a chance. Always nice to hear from you and have you visit.
Thank you! I will google him. Have a lovely week!