Where did 55,000 BTC go? The $83K-$84K price cluster is revealing an important signal. Since BTC first surged to $87K on 9/21, exchange balances have dropped by approximately 55,000 BTC from their peak (Figure 1). During the same period, addresses holding >100k and 10k-100k BTC collectively decreased by about 55,000 BTC, while addresses holding 1k-10k BTC increased by 50,000 BTC (Figures 2-4), almost a one-to-one match. In other words, someone withdrew around 50,000 BTC from the main cold wallets of exchanges and transferred them to addresses holding thousands of BTC, while BTC's price remained stable between $83K and $85K. Combining this with data on the price cluster structure, the $83K-$84K cluster was precisely accumulated during this period. Notably, there’s significant buying support every time the price hits $83K. For the long-term trend, this is a positive signal. It indicates that the BTC previously piled up on exchanges is now being taken off the market. Looking at it this way, this $83K-$84K price cluster is unlikely to be invalid data caused by custodial wallet reorganization (like the last time with Coinbase). Instead, it seems more like traces left by some OTC whales collecting BTC and transferring it to self-custody addresses.