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The question is somewhat complex and directed to clearing thing out.

Suppose that n is the order of the cyclic group. It n - 1 is the number of all private keys possible

n = 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141

We also know that every private and public key has its modular inverse.
To get a modular inverse of a private key, we need to subtract the private key from n.

n - privKey

To get a modular inverse of a public key, we’ll have to multiply its y coordinate by -1 and modulo by the p – order of the finite field.

x,y = x, -y % p

A modular inversed public key has the same x coordinate as original public key, but different y coordinate, and the y coordinate is always different in its polarity.
If the original y was odd, in a modular inversed key it will be even, and vice versa.

If a compressed public key has "02" index at the biggining then it has even y. If it is "03" then it is odd.

The question is, if the y coordinate of a public key is even, does it mean that the corresponding private key is less than n/2 by its value? If the y is odd, the private key is more than n/2 ?

Is there any relationship between the eveness/oddness of the y (or x) coordinate and the value of the corresponding private key?

Is there any way to know that the private key is more or less than n/2 while not knowing the private key itself?

Is there a way to find out the public key of an address that never sent Bitcoin but only received it?

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By pplny

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