I've been researching quantum computing and its potential impact on Bitcoin, and a key concern came up:
If Bitcoin eventually upgrades to a quantum-resistant signature scheme (e.g., replacing ECDSA), wouldn’t that make current ASIC miners obsolete, since they're all optimized for the current cryptographic assumptions?
ASIC only perform SHA-256 twice on 80-byte data (block header), so it doesn't care what kind of signature cryptography used in Bitcoin TX.