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Can the public key be deduced from the private key? Can a public key derive a private key?

2026-06-30 19:03:56
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No, because this is a meaningless warning, because Bitcoin security should not be viewed this way.

Your security measures are incorrect. Anyone who treats security measures correctly warns against reusing addresses.

My opinion is that if the possibility of obtaining the private key by reversing the public key is even small and we have not migrated to a resistant protocol (hard fork), then Bitcoin is outdated!

This means that the warning you are talking about is either meaningless (meaning it is impossible to reverse the public key and reusing your address will not put you at any risk) or it is not a warning (Bitcoin is over and you should not even use it anymore).

No matter how unlikely it may be, it is always possible to obtain the private key from the public key, and it will always be possible in the future. So your opinion is untenable.

There are no quantum-resistant signatures in Bitcoin yet, why warn users of threats they cannot avoid?

The reason you should not reuse a Bitcoin address to receive payments is for privacy, not security.

Wrong. This is also about safety. If you don\'t consume from an address, your public key is safe under the SHA256 algorithm. As far as we know so far, quantum computers pose no risk to the SHA256 algorithm.

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