In public-key cryptography, what is the specific role of the sender's private key and the receiver's public key when creating a digital signature for a blockchain transaction?
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A
The sender's private key encrypts the message, and the receiver's public key decrypts it.
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B
The sender's private key signs a hash of the transaction, and the receiver's public key verifies the signature.
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C
The sender's private key generates the transaction hash, and the receiver's public key adds it to the block.
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D
The sender's private key encrypts the entire block, and the receiver's public key confirms the transaction.