US Patent 10198924 Transaction terminal silent alert systems

A transaction terminal silent alarm system having processor(s) and memory storing instructions that, when executed by the processor(s), cause the system to perform a method is disclosed. Upon receiving, from a user device, an authentication request to complete a transaction at a transaction terminal, the system may determine whether a fingerprint scan matches a stored fingerprint. Responsive to the fingerprint scan matching a stored normal fingerprint and absent receiving another fingerprint that matches a stored cancellation fingerprint, the system may direct the transaction terminal to complete the transaction. Responsive to the fingerprint scan matching a stored under-duress fingerprint, the system may direct the transaction terminal to send a silent alert to law enforcement and direct the transaction terminal to delay the transaction. Responsive to the fingerprint scan not matching any stored fingerprints, the system may direct the user device to display a fingerprint rescan message.