feat: NFC + Bluetooth Low Energy Transfer of Ecash - #486
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July 20, 2026 16:02
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Very vibe coded, but this PR implements a proof of concept bluetooth low energy transfer of Ecash.
The basic idea is that two phones who want to transmit ecash to each other can just tap to exchange public keys. A shared secret using Diffie Hellman is created, which allows the sender to encrypt the ecash to the receiver. The receiver then listens for Ecash being transmitted over bluetooth low energy, decrypts the payload, and prompts the user to reissue the ecash. One tap, then magically the ecash shows up, very slick!