It's a pleasure for me to release the free version and digital versions available on Amazon and Google Play. All the content is available for free on Github repository too.
I would like to thank, firstly, the Mastering Monero team. UncagedPotential (the editor), Anhdres (the illustrator), Baltsar (the graphic designer), SGP (the publisher), and me have been working on digital versions for more than one year. I'm nothing without this community and those people. Secondly, I'd like to thank all the community contributors and developers who helped to make Monero the most private cryptocurrency. Each one of you - except fro tr0lls - made special this community and I'm very pleased to be one member of it.
There are only two things that I ask you to do: leaving a sincere feedback* and sharing this free resource to anyone in the world. To cite Leonardo Da Vinci, "The noblest pleasure is the joy of understanding.", I fully agree with him.
"Knowledge, like air, is vital to life. Like air, no one should be denied it. - Alan Moore."
Thank you guys. Happy 5th anniversary of Monero project.
*Criticism also very appreciated.
It was approved on Amazon today, but it may take 2 days to appear. Those who purchased the paperback can buy the eBook at a discounted price.