Bitcoin whitepaper
#learnstr
https://www.google.com/url?sa=t&source=web&rct=j&url=https://bitcoin.org/bitcoin.pdf&ved=2ahUKEwiqm97hzrH-AhVc57sIHa0EDGUQFnoECBgQAQ&usg=AOvVaw05-4mYD7EyyKjwcHh8i0Vw
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