I'm just confused a little bit.
The challenge is the solve a 80 bit key which is 20 HEX but the challenge shows a way longer private key than the maximal 64 HEX or 256 bits.
Can anyone explain those mystery keys?
let's say you have a private key 0x659756abf6c17ca70e00000000f0000000000140be6ddd93e441f8d4b4a85653b20b4cdcc5c74
8207a0daa16191d07a425d8080c276f9412472e0429e61bc355
whose public key 0264a3c32819270c6915ba1a810ad26fb23528b0f41f2146929504da7574eaffc7
if you take this (private key) % N you will get privet key 0xe892209e42f5904ee01bcd69f2e496d156169b3debc5f9594c5ec8e54554e9cd
whose public key is the same 0264a3c32819270c6915ba1a810ad26fb23528b0f41f2146929504da7574eaffc7