On October 1 (UTC+8), developer @callebtc successfully demonstrated sending Cashu e-cash backed by Bitcoin over Apple's Find My network, as reported by Bitcoin News on X. The demonstration used small devices to broadcast encrypted data disguised as Bluetooth signals, which nearby Apple devices then relayed through their network. This technique enables users to receive Cashu electronic cash without Wi-Fi or cellular connectivity, suggesting potential opportunities for upgrading peer-to-peer transaction networks.
The recipient pulls token reports through an Apple account and rebuilds the token piece by piece using a Python script. As reported by X, each signal carries only two bits of data, requiring well over 1,000 broadcasts for a typical token. The protocol notes that the payload carries no encryption, and the IDs needed to look up the data are public. A typical token requires well over 1,000 broadcasts to complete the transaction process.
The developer warns that every broadcast token is public, meaning anyone who recovers one can spend it. According to the protocol documentation, the weak point lies in the transport mechanism itself, as the payload carries no encryption and the IDs needed to look up the data are public. The documentation advises sending only giveaway amounts due to these security concerns. The receiver also accesses Apple's Find My network through an unofficial interface, which could cause the tool to stop working if Apple changes that interface.
The Find My experiment remains a novelty rather than a payment product, as reported by X. The developer describes it as possibly the most absurd way to send Bitcoin yet. The documentation emphasizes that delivery is slow, unofficial, and carries no guarantee. Other developers are pursuing private Bitcoin transfers on the base layer instead of using this experimental method, though this latest demonstration by CalleBTC represents a significant advancement in on-chain news events highlighting novel transmission methods.
