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Agreed, this is a scam, be careful out there...

https://bitcoinexchangeguide.com/kryptonex-research-group/

Google 'Kryptonex Research Group' and you'll get lots of hits indicating this is a...

Here is my list (not exhaustive) of the many books that were significant in my own journey. It should be noted that nearly all these books were impactful pre-internet days and that post internet...