It's not just Bitcoin: every major chain uses the same quantum-vulnerable signatures, and Ethereum is arguably more exposed

Secure yourself with 5 steps:

1. Use a modern HD wallet. Any current hardware or standard software wallet generates a fresh address per receive - that alone puts you in the safe column.

2. Never reuse an address you have spent from. Spending reveals the public key forever; anything left behind sits in the exposed pile.

3. If you hold coins on old or reused addresses, move them once to a freshly generated modern address. That single transaction takes them out of the harvest-now-decrypt-later pool.

4. Watch for the upgrade, not the headlines. The milestone that matters is a quantum-resistant address type going live (BIP-360 or a successor) - adopt it when it ships. Chip announcements with bigger qubit counts are not the signal.

5. Do not panic-sell on quantum news. The threat is a solvable, years-away engineering problem the ecosystem is already working on - a reason for hygiene, not for exit.

full version with the tables at https://gmdmarkets.com/does-quantum-threaten-bitcoin