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(Solved): . . If bitcoins were sent to a certain address, why only its owner can use them? What is a “doubl ...
. . If bitcoins were sent to a certain address, why only its owner can use them? What is a “double-spending attack” in cryptocurrencies? What is the “51% attack” in Bitcoin? How does a password manager (software) work? What are the main methods for biometric authentication? .