Quote from: pooya87 on August 27, 2023, 05:45:08 AM

Quote from: cfbtcman on August 26, 2023, 01:39:29 PM

I don't care about if it is P2PKH or something else, the only thing I care about is if our x-only keep private if we use a tweaked bitcoin taproot address or it can be calculated by the address as in normal taproot addresses without tweak?

If we use the second method of creating the Taproot address (explained here) then no we can't know the public key that was used, we only see the "tweaked" public key.

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For many guys it seem it is not important to hide the public key, but for Satoshi it was important, so, I keep on Satoshi line, Taproot addresses YES, but need to be possible to hide the public key, if not, no thanks.

In asymmetric cryptography the public key needs to be public! otherwise the algorithm is useless.

Quote from: cfbtcman on August 26, 2023, 01:47:39 PM

What I think that is wrong, because if we know "c" we can't compute T by hashing P because we still don't know P, so, how can we use it to hash?

ChatGPT is not suitable to answer anything technical. A simple Google search would give you better results in most cases.
In this case you are correct, by having the Tweaked pubkey alone we can not reverse it to get the original pubkey because the last step is adding two pubkeys which is not reversible (pub_tweak = pub + (t * G)).

Thank you very much for your time on this, you really help me to go in the right direction,