A system verifies that a user physically holds an item, such as a financial document, before approving a transaction. It prompts the user to show the item to a camera, then processes the captured image to create a unique digital fingerprint. If this fingerprint confirms the item's presence, its identifier is sent to a remote system to proceed with the transaction.
Why it matters: Filed before smartphones with high-quality cameras were ubiquitous. A phone's integrated camera and processing power can now easily perform the image capture and hashing described, making remote verification practical.
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