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Look up the term "fork" in the context of cryptocurrencies. It will answer all your questions and you will save yourself a lot of brain cycles.

• echelon 6y ago
  If crypto is broken, any fork could be broken too. It's a question of how much time a new algorithm buys.
  • danaur 6y ago
    There are quantum resistant methods forks can use.
    • RIMR 6y ago
      But my old keys, that hold my funds, are still traditionally encrypted, so how am I supposed to securely claim my same bitcoins on the other side of the fork?
• RIMR 6y ago
  How do you migrate the old keys to a quantum fork without allowing the exploit to still exist retroactively? I could exploit the old blockchain, then migrate my stolen keys to the quantum blockchain. Forking doesn't work here. Traditional computing and Quantum computing are different enough that "porting" isn't just something you can do.
• ASalazarMX 6y ago
  "Guys, we are going to start quantum exploiting your blockchain for profit in a couple of months, please fork before that XOXO" - No criminal ever More likely: "We'll skim from dormant wallets that won't be immediately noticed, and when it becomes too obvious, we move all of Satoshi's bitcoins to force an emergency fork that launders our profits".