Contrary to popular belief, Bitcoin is already quantum resistant as long as the coins reside in an address that has never been spent from.

Why? Because Bitcoin addresses are hashes of public keys (P2PKH, P2WPKH, P2TR). As long as the public key remains undisclosed, quantum computers have no public data to reverse engineer, making the funds safe even against theoretical quantum attacks.

The risk begins only when a transaction is broadcast and the public key is revealed. That’s when a powerful enough quantum machine exists, which could be many years away.