A group that drained nearly 4,000 BTC from Blockstream’s Liquid Network returned 3,400 BTC, kept about 598.5 BTC, demanded a 10% bounty, and warned L-BTC holders could face a 15% loss. Now Blockstream has answered with an unusually direct ultimatum: It will not pay. The company says taking the bitcoin was theft, not white-hat security […]…