Quote from: btc-freedom-money on Today at 07:07:11 PM

Quote from: Charles-Tim on Today at 11:43:33 AM

Quote from: btc-freedom-money on Today at 11:29:14 AM

A friend asked me if she can just create a new address in her hw wallet, will it be secret address? Or is it likely coinanalys or some bitcoin server would be able to link that new address to all the other ones inside the hw wallet?

Central servers do not just know only your addresses but also your IP addresses and that can help in knowing other wallets.

What i was thinking about is if its possible for a bitcoin address to be reversed to the public key? And then that public key reversed to see which xpub created it? I remember reading something about that.
I know it's not possible to know which master private key created the xpub but I don't know about the other things. Because if you can with an address do some algorithm to see which xpub it comes from, then you can find out all the other addresses that the xpub has created. Is any of this possible?

You need to understand that public keys are been converted to wallet address through hash function(SHA-256 and RIPEMD-160) and this function are one way, you can only truncate large characters into a shot one using hash function but you can't do it back to get original data.

You cannot get extended public key(xpub) from a single public key, it's not possible but you can use xpub to create as many as different public keys that you want.

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Quote from: Cookdata on Today at 12:59:18 PM

Using a passphrase might be helpful in this situation, it helps you generate different wallet addresses even with the same seed phrase

Can I without worry share my seed phrase publicly online if I only use a hidden wallet which uses a strong passphrase?

This isn't not security wise, why will you even expose your seed phrase for people in the first place. You may have your seed phrase extended with a pass phrase but it can be brute force if it's short word, you need maximum privacy by the way, seed phrase are meant to be hidden from the rest of the world.