Bitcoin (BTC) is showing signs of tightening supply, with the Scarcity Index on Binance reaching levels not seen since October 2025. The shift comes as whale wallets holding at least 100 BTC hit a record, while long-term holder selling remains below the 2021 peak. Scarcity Index Surge Reflects Tight Bitcoin Supply Conditions Analyst Arab Chain reported that the Bitcoin Scarcity Index on Binance has climbed to approximately 5. 10