GuardianCall

GuardianCall helps older adults and their families pause before acting on a suspicious phone call. Scammers create urgency, impersonate trusted people, and pressure victims to send money or reveal security codes. GuardianCall gives the person a clear warning and a practical way to check the request independently. The phone stays on speaker while GuardianCall runs on a nearby tablet or laptop. With consent, the full app captures short audio clips. Meta’s Muse Voice Transcribe converts speech to text, and Muse Spark interprets the conversation for requests involving money, sensitive information, secrecy, or pressure. GuardianCall validates supporting quotes against the transcript and applies explicit rules to produce a provisional warning. It can speak a pause instruction and help the user open a trusted number in their dialer. Its distinctive feature is checking the exact request. In Decision room, a person reviews the purpose, amount, and destination before requesting a signed response from a previously enrolled device. Cryptographic checks reject changed details, expired requests, and reused responses within the receiving session. A matching signature never authorizes a payment or proves the caller’s identity. The prototype includes a public, login-free judge demo with synthetic caller examples, a benign control, interactive tampering tests, and recorded Meta API evidence. The public rehearsal is explicitly offline; live Meta integration is included in the source. The code passes 96 automated tests. GuardianCall’s goal is to give families time and clarity when a caller is pushing them to act. It does not intercept cellular calls or guarantee fraud detection; performance in real homes remains to be validated.