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I am sure many of you already read this amazing kickstarter by Satoshi Nakamoto.
But in anyway i think it is still valuable content for who do not know about it.
Everything starts with this 8 pages document which explains everything about peer-to-peer electronic cash system.
BITCOIN :)
https://bitcoin.org/bitcoin.pdf
it is a little bit technical but easy to follow main logic.
At least need to review quickly to understand what is all about.