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You can already generate every possible private keys. What stop people to steal everything is that you must spend time to search the right one for every UTXO

Quantum computer can accellerate this.

What can happen is that #Bitcoin, for survive, has integrated a new quantum-resistance algorithm for new transactions. Those ones will be safe, but UTXO never migrated to the new quantum-proof address (like lost coins) might be stolen.

I think you're way off. Firstly, quantum computer isn't a silver bullet. How big it can scale depends (among other things) on how many qbits it can handle.

Then we need an algorithm that can theoretically solve a particular problem. So that might be: given an address, can I generate its private key? Usually it's: given a public key, if generated with sekp256k1, can I calculate its private key?

So far, I don't know that there's an algorithm for this although I have heard that there are algorithms that could theoretically crack other ECC (elliptic curve cryptography) algorithms, maybe that means all ECC algos?

Then we have the cardinal rule: DO NOT REUSE ADDRESSES. Until you spend from an address, your public key is unknown, instead your address is a hash of your public key. I don't know if there's a theoretical program that could crack that either.

Once you spend from an address, your security goes from hash+ECC to just ECC for any funds left at the same address or any new funds going into that same address.

So don't do that 🤷🏻

First of all, you have to understand not only bitcoin is at risk — our ENTIRE life is dependent on the same math that assumes bitcoin is not hackable. So if there is something able to hack bitcoin, then we anyway have MUCH bigger problems and bitcoin is itrelevant

Second, quantum computing is a myth. Quantum resistant algos is a myth. They do not exist. There are even no working theories. There are a couple of math theories and some practical experiments in this area but its just scientists having fun. Today, even if something like this gets developed, nobody knows will it be more efficient at hacking bitcoin than an ASICS fleet or less efficient. Nobody knows how those quantum algos (to attack and to defend) would look like. Thats all speculations

Indeed, its an extremely interesting area of science which has a chance to change our lives significantly in future. But today its probably less real than flying cars back into 1960x

#Bitcoin is based on eliptic curve cryptography and SHA256, the latter is said to be quantum safe.

Could be a theoretical threat in 10-20 years to the ECC if the public key is known.

The world will realize it when Satoshis coins (sent to public key) are getting moved.

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