The index measures the flow of digital assets into trading venues by tracking the volume of transfers from external wallets to exchanges. Empirical analysis reveals that Exchange outflows directly reduce the liquid supply available for immediate trading. The act of transferring BTC to cold storage reflects a strategic shift from speculative trading to long-term holding—a behavioral marker of investor confidence. Under favorable macroeconomic conditions, this may catalyze scarcity-driven upward price elasticity, akin to a soft supply squeeze. The index is normalized using a wide range of lookback windows in order to be easily modelable and interpretable.