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Elliptic Curve Digital Signature Algorithm (ECDSA) is used within Bitcoin and Ethereum. In this case we will generate a private key and a public key point \((x,y)\). This create a signature value of the \((r,s)\). You should be able to enter base 10 or base 16 (hex) integer values for the public key point \((x,y)\) and the signature \((r,s)\).