Give me a test public key whose private is known to you. Go ahead and generate a private key at bitaddress.org. Post here its UNCOMPRESSED public key. I'll return you another public key whose Private Key will be next to your private key. like this.
If your private key (in decimals) is 66899805185916575564669809333844135879224147665865100807356278765935415566327
I'll give you the public key for the private key 66899805185916575564669809333844135879224147665865100807356278765935415566328
Ok, I don't need -1 or +1, because I can give you -+1Trillion trillion trillion. I need you to divide my public key by 2 and give me a public key which has a private key half of my original private key!
04A9FD905E9984BC014724518105D8485FA3F004F24C44EDBBBE92F4E9DFABF7AA6A72EF8785F41
C29AADA186284238D3D2BDDBC4CEA5D1C754496C774409F336F
@, whanau
Here:
023bfe84c13671c55cf8f0710d2959890cd16b63176365ef9d98810d8e987c82e1