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https://s3.amazonaws.com/academia.edu.documents/54517945/Bitcoin_paper_Original_2.pdf?response-content-disposition=inline%3B%20filename%3DBitcoin_A_Peer-to-Peer_Electronic_Cash_S.pdf&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWOWYYGZ2Y53UL3A%2F20191210%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20191210T091100Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=06b91f2c3f0e089c384a6923b0b85a37573a9a21e8dc0c7d4b68cad5a32c53d0