I'm searching what was this address... but after a first check, it doesnt look like in my common ones...

Searching in the original yaamp sources to check if that was this one

1Auhps1mHZQpoX4mCcVL8odU81VakZQ6dR is mine (for yiimp donations), but the 1C.. ive no idea :/

edit: its indeed the address which was in original sources, so sorry... nothing i can do :

https://github.com/globalzon/yaamp/blob/master/web/serverconfig.php