thanks a lot for the info and advice ,

ok what about is this address PtsRkd9ufw6FCmZifaZmG6ESHd7YBBdGUP

i posted this address in public here
https://bitcointalk.org/index.php?topic=626596.msg7454019#msg7454019

it's not a bitcoin address, it's a pyramidscoin address which is an altcoin i made starts with (P) letter ,

https://github.com/kheops/pyramidscoin/blob/98bda87547f2f68ed3cd420fb10e7762375de526/src/base58.h#L275

but still it's made of an (ECDSA) key pair which is the whole point,

i have the original (ECDSA) key pair (secret exponent & public key ) of this address which can be converted to any kind of coin address

i can convert it to btc address and sign a message with it