When the fee binds, holders of Bitcoin face a menu with three paths, and only one of them is a clean test of substitution. Pay and stay — retain base-layer settlement at the prevailing price, the cost of sovereignty. Internalize — move into a second layer, custodian, or wrapper, trading fees for counterparty and permission risk. Reroute — carry permissionless finality to a competing bearer base layer. The desk isolates the third path because it leaves a trace: it is the only response that can convert into retained, durable settlement elsewhere. Each path is registered and currently not assessed.