Wow this is so weird, I've had this exact same idea before! I don't know if you're familiar with Dark Forest strikes from the Dark Forest book, but in the book, or the one after that, aliens use bombs that slow the speed of light in the space of single solar systems, to prevent civilizations from becoming threats. Always thought it would be funny if actual dark forest strikes were just the bitcoin whitepaper and bitcoin/crypto eventually use up all available resources before civilization can become a problem lol. Hope someone makes this an actual story someday.