According to @ki_young_ju, US custody wallets holding 100–1,000 BTC each—excluding exchanges and miners—provide a rough gauge of institutional demand, and ETF holdings are included in this read. Source: @ki_young_ju, X, Jan 19, 2026. Over the past year, this cohort added 577K BTC (about $53B), and inflows are still continuing, indicating sustained institutional buying pressure for BTC. Source: @ki_young_ju, X, Jan 19, 2026. Traders can monitor the 100–1,000 BTC US custody wallet cohort and ETF balances as a proxy for institutional flow momentum. Source: @ki_young_ju, X, Jan 19, 2026.