Arcade machines employ sophisticated mechanisms to detect counterfeit coins and prevent payment fraud, ensuring fair revenue collection for operators. Traditional coin-operated systems use precise physical validation: coins are measured for diameter, thickness, and weight against calibrated standards. Magnetic properties are analyzed through electromagnetic sensors that identify genuine metal composition, while edge scanning detects irregular grooves or smooth surfaces. Modern digital payment interfaces incorporate encrypted token systems and QR code verification to prevent digital fraud. Advanced machines feature optical scanners that compare coin patterns to stored images of legitimate currency. Anti-stringing mechanisms prevent cheating where coins attached to strings are retrieved after triggering credit. Regular calibration updates address new counterfeit methods, with some systems capable of remote firmware upgrades. High-security establishments often use proprietary tokens or smart card systems that are cryptographically signed to prevent duplication. These multi-layered approaches—combining physical authentication, digital security, and constant system updates—create robust protection against evolving fraud techniques while maintaining seamless player experience.