How to define which coordinate is negative?

[NotATether]

thanks sir!!

is there any way to find private key range
first half below this(57896044618658097711785492504343953926418782139537452191302581570759080747168) or
second half above this(57896044618658097711785492504343953926418782139537452191302581570759080747168) using public key

With only the public key, that is impossible (again, read the Stack Exchange link I just posted), because if you were able to do that, then you could also divide the public key by two, and successively guess subranges of the ones you posted above, until you have the correct private key. Basically, you'd be able to brute force the private key.

[ajeev]

all points with lowest Y-coordinate are odd and with highest are even.

can you please explain this how you are saying odd or even.

[ajeev]

pk1 = '02C6047F9441ED7D6D3045406E95C07CD85C778E4B8CEF3CA7ABAC09B95C709EE5'#private key=2
pk2 = '022f8bde4d1a07209355b4a7250a5c5128e88b84bddc619ab7cba8d569b240efe4'#private key=5


P = pub2point(pk1)
Q = pub2point(pk2)

eq = P.x == Q.x
lt = P.x < Q.x
R = eq or lt
print(R)

>>>>>>>.false


Q is big because it is private key 5 but im getting false output

Since you know the private keys, and you want to sort by private keys, then you must compare the private keys.

You should only compare X points if you want to sort by public key. But since you want to compare by private keys, you have to compare the private keys themselves.

There is no way to order a list of private keys using only their public keys - it is like trying to order a list of strings based on their SHA256 hashes - that is impossible.

hi can you please tell me how to find the publickey of btc address

[o_e_l_e_o]

hi can you please tell me how to find the publickey of btc address

If the only information you have is the address, then chances are you cannot.

Most bitcoin addresses are hashes of the public key or the locking script. Hashing is a one way function and cannot be reversed, so you cannot take an address and go backwards to find the public key. However, when a transaction spending coins from that address is made, the public key will be revealed in the signature of that transaction.

So if you have an address which has never made a transaction, you cannot find out the public key (unless of course you generated that address from the public key yourself). If the address has made a transaction, then you can look at that transaction data and extract the public key from it. Where exactly the public key is within that data depends on the type of address and the transaction itself.

There are a few exceptions to the above, such as P2PK and P2TR outputs.