Stablecoins run on blockchains, and blockchains have three hard requirements that all need internet: **1. Broadcasting the transaction** A payment is just a signed message. To actually move funds, that message must be submitted to the network so nodes can receive it. **2. Consensus and finality** Validators/miners must include the transaction in a block and reach agreement that it happened. Without connectivity, no block, no settlement. **3. Verifying the sender's balance** The current state of who owns what lives on the network. Without querying it, you can't confirm the sender hasn't already spent those funds elsewhere -- the classic double-spend problem. --- **Why this is harder than it looks** Cash works offline because a physical note is self-proving and self-transferring. A stablecoin balance isn't held in a device -- it's an entry in a global ledger. "Paying" offline would mean handing over a signed promise, but the recipient has no way to know that promise isn't already spent until they reconnect. --- **Partial workarounds being explored** - **Hardware security chips** (used in some CBDC pilots, e.g. the ECB's digital euro research) -- a tamper-resistant chip holds a balance offline; the chip enforces spend limits and prevents double-spend locally, then settles when reconnected - **Lightning Network** -- payment channels allow off-chain transfers, but channel setup/teardown still needs the base layer - **Signed IOUs** -- parties can exchange cryptographic promises offline and settle later, but this reintroduces counterparty trust None of these are production stablecoin rails today. For now, no internet means no confirmed stablecoin payment.