BTCPay Server warned operators to shut down servers after reports of attackers draining hot wallets running outdated software. No user count or loss figure was provided in the excerpt, so the scale is unconfirmed. Separately, US spot bitcoin ETFs recorded $643.2 million in outflows Friday, the largest single-day outflow since June 25, following Thursday's $6.4 billion Binance hack. Market cap fell 3.35% over 24 hours; BTC trades near $78,135, up 0.31% on the day but down roughly 2.1% over seven days. Observation: self-custody software versions and exchange security are under renewed scrutiny after consecutive high-profile incidents. Interpretation: ETF outflows suggest institutional caution may persist while retail node operators face direct security pressure. What matters next: whether BTCPay releases a patched version quickly, and whether ETF flows stabilize or extend losses into the coming week.