Bitcoin-backed Cashu e-cash sent through Apple’s Find My network

  • A Cashu developer demonstrated Bitcoin-token transfers through Apple’s Find My network.
  • Each signal carries two bits, requiring over 1,000 broadcasts for a typical token.
  • The unofficial method exposes tokens publicly and offers no guaranteed delivery.

A developer of the open-source Cashu electronic cash protocol demonstrated sending tokens redeemable for Bitcoin from an offline device through Apple’s Find My network. Cheap ESP32 hardware broadcasts a Cashu token over Bluetooth in signals that imitate lost-item beacons; nearby iPhones relay the data through Find My, allowing a recipient to retrieve and reconstruct it with an Apple account. Each broadcast carries only two bits, so a typical token requires well over 1,000 transmissions. The developer warned that the payload and lookup identifiers are public, the data is not encrypted, and anyone recovering a token can spend it. The documentation therefore recommends sending only giveaway amounts. The slow, unofficial process depends on an interface that Apple could change or disable, leaving the experiment as a novelty rather than a payment product.

The information on this website is generated using AI and we cannot guarantee its accuracy. Please use it as reference information only.