<p data-start="954" data-end="960">Hello,<span></span></p><p data-start="965" data-end="1040">I have been studying the Bitcoin protocol and would like to ask a question.</p><p data-start="1045" data-end="1194">In your opinion, what is currently the biggest long-term security challenge for Bitcoin: quantum computing, mining centralization, or something else?</p><p data-start="1199" data-end="1232">I would appreciate your thoughts.</p><p data-start="1237" data-end="1247">Thank you.</p><p data-start="1237" data-end="1247" style="font-family: Arial, sans-serif; font-size: 14px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">James Lancaster</p>