Sign a message from the address that had 139 Bitcoin in it. It's easier to take you seriously that way.
https://bitcointalk.org/index.php?topic=5476101bc1qn3d7vyks0k3fx38xkxazpep8830ttmydwekrnl
IAJdBrmsgwWQU6IFXu1jC77GJuDguNv82ERXT2R8UywQZ7565idpdZpxjWflFVCnrjEfAJC5YcSnQUa jrgdmaZc
https://www.verifybitcoinmessage.com can verify this is a valid signature for this address and message
I am on mobile so I can't have bitcoin core where I am but it should be ok.