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When calculating the public key, what principle is used to take the even or odd y coordinate for x?

Moussa by Moussa
February 11, 2025
in Bitcoin
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peer discovery – how to obtain the IP addresses of nodes for mining pools?
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It is not selected; it is computed.

The elliptic curve point multiplication algorithm outputs a point, which has an X and Y coordinate.

While it is true that negating the private key will negate the public key’s Y coordinate, there is no simple rule for determining what the parity of Y will be without actually performing the elliptic curve multiplication operation. In fact, there cannot be such a rule; it would constitute a break in the discrete logarithm security of the curve.



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