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Hi,
I found this on internet:
To create a P2TR (Pay-to-Taproot) address for a single public key, you need to:
1º Check that the y-coordinate of your public key is even, if not, negate the public key. Taproot requires that the y coordinate of the public key is even.
What is the meaning of this?
In this example I gave you, Y was odd and it worked perfectly!
Can you help ? !
That does not matter for address generation because your x value does not change when negating a public key meaning P(x,y) = -P(x,y) = P(x,-y) and we only use the x coordinate in the address.
Even y coordinate is something you should check and take some extra steps when signing and verifying ECSDSA signatures.