A Cashu developer has pushed a Bitcoin (BTC) transfer across Apple's Find My network from a device that never touches the internet, announcing the result on X on September 30, 2026.

The experiment was carried out by calle, the creator of the Cashu ecash protocol. In the announcement, calle called the Find My network possibly the "most absurd medium" for a Bitcoin transfer, with the transaction data moving in 2-bit broadcasts across Apple's crowdsourced device network. The feat underlines a property at the core of such experiments: a Bitcoin transaction needs some path to reach the network, but not necessarily an internet connection of its own.

How a Bitcoin transfer can ride Apple's Find My network

Apple's Find My network is a crowdsourced locating system built on hundreds of millions of iPhones, iPads, and Macs. Accessories such as AirTags emit short Bluetooth Low Energy advertisements, and any nearby Apple device that detects the signal can anonymously relay the encrypted payload to Apple's servers, where the owner retrieves it through the Find My app. Because the surrounding devices provide the connectivity, the item being located — or the device transmitting data — never needs its own internet connection.

Calle used that relay mechanism to move transaction data off an air-gapped device, encoding it into 2-bit broadcasts that crossed the Find My network and carried the transfer through without any direct connection to the internet. The channel is narrow by design: even a minimal Bitcoin transaction is hundreds of times larger than a single 2-bit burst, so a transfer sent this way has to be fragmented across a long sequence of relayed messages.

Background: Cashu and offline Bitcoin experiments

Cashu is an open-source ecash protocol for Bitcoin based on Chaumian blind signatures, in which a mint issues private, self-custodial tokens without being able to link them to the users who spend them. The protocol, created by calle, is most commonly over the Lightning Network.

Moving Bitcoin without conventional connectivity has been explored before: mesh-radio setups and satellite broadcasts have both been used to relay or receive transactions, and security researchers have previously demonstrated that the Find My protocol can be reverse-engineered to carry short messages from offline hardware. The latest experiment extends that lineage, turning Apple's tracking infrastructure into an unexpected transport for a Bitcoin transaction — and, unlike mesh or satellite routes, one that runs entirely through Apple's own devices and servers. With bandwidth measured in bits, the result is best read as a demonstration of transport rather than a practical payment channel: proof that a transaction can still leave an offline device when no direct connection exists.

This content was first published on COINOTAG: https://en.coinotag.com/cashu-developer-sends-bitcoin-over-apple-find-my