Hackers stole nearly 4,000 BTC, sent back 3,400 BTC and sought a 10% cut; Blockstream warns: "Return the bitcoin" or face law enforcement and legal action

A large-scale BTC theft involving nearly 4,000 BTC, partial return (3,400 BTC), and an extortion demand highlights persistent counterparty and custody risk in crypto markets. Blockstream's refusal and escalation to law enforcement underscores increasing legal pressure on attackers. Near term, the episode can raise risk premia and increase sensitivity around exchange, custodian, and wallet-security headlines, influencing positioning and liquidity in BTC.