Ecway Technologies provides IEEE projects and software developments with offices in multiple cities in Tamil Nadu, India. They can be contacted by phone or through their website. The document describes a proposed system called APPLAUS for privacy-preserving and collusion-resistant location proof updating. It allows colocated Bluetooth devices to mutually generate location proofs to send to a location proof server, while using periodically changed pseudonyms to protect users' location privacy from each other and the server. The system also aims to detect colluding attacks through betweenness ranking and correlation clustering approaches. Experimental results show APPLAUS can effectively provide location proofs while preserving privacy and detecting collusion.