U.S. defense officials are increasingly framing Bitcoin (BTC) as more than a financial asset, pointing to potential national-security uses in cyber defense. The topic surfaced Tuesday during an IndoPacific hearing of the Senate Armed Services Committee, where U.S. Indo-Pacific Command (INDOPACOM) Commander Samuel Paparo said Bitcoin's proof-of-work design could have meaningful cybersecurity applications. "Bitcoin is a reality," Paparo told lawmakers. "Beyond its economic aspects, it offers very important computer science applications in terms of cybersecurity." Officials argued that one of the core challenges in cyberspace is that attacks can be launched at near-zero marginal cost compared with conventional warfare, widening the threat landscape from spam operations to ransomware. Against that backdrop, they said Bitcoin's proof-of-work model could introduce a measurable physical cost to digital aggression by requiring real-world energy expenditure to validate each transaction or signal, effectively forcing an attacker to incur a tangible cost for every attempt. Academic work on the concept has been associated with Jason Lowery, whose Massachusetts Institute of Technology thesis characterizes Bitcoin less as a payment system and more as an "electrocybersecurity technology." Under that framework, Bitcoin's value is tied primarily to proof of work rather than the blockchain ledger itself, because the mechanism makes signal generation costly and carries classic deterrence theory into the digital realm. The defensive lens on Bitcoin is gaining attention amid heightened geopolitical friction in the Indo-Pacific region. In recent years, the U.S. and China have been seen as competing indirectly over Bitcoin mining capacity and holdings. The U.S. has moved into a leading position in global Bitcoin hash rate, and the U.S. government is estimated to hold about 328,000 BTC. China is believed to hold roughly 190,000 BTC linked to assets seized from the PlusToken operation. This is not investment advice.