Key Points No top-20 cryptocurrency is fully quantum-safe yet, but Bitcoin and Ethereum both have upgrade paths underway. Post-quantum signatures are bigger and slower, which raises storage costs for every computer running the network. The thing to watch is not whether quantum-safe code gets written, but how long it takes anyone to use it. 10 stocks we like better than Bitcoin › Think about the lock on your front door. Now imagine a locksmith who can glance at the outside of that lock and work out the exact shape of your key. There's no picking, forcing, or breaking anything. The locksmith just looks at the security tool you show to the whole world every day, then walks right in.
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