Coinbase supports a staged transition approach, such as a 1-of-2 setup, allowing active wallets to be spent using either a classical key or a post-quantum key before legacy signature rules are finalized

How changes to Bitcoin's rules get proposed, fought over and adopted, from improvement proposals and soft forks to upgrade debates like quantum resistance.

Whether quantum computers could break the cryptography securing Bitcoin and other blockchains, and how networks plan to migrate before that day.