Hi friends !
As I want to transfer funds he asks me to inform my private key? How to find this private key? thank you
you not need private key if only send or transfer funds in your bitcoin
if except you want import/export addres you need private key
new blockchain without private key, xapo and coinbase same without private key too
so what your use service wallt in your addres ?, if you want explain about private key, you must tell about service wallet in your use addres