Checking if a BTC address belongs to Wallet XY

[peterpan7]

Hey There,

Is there a way to check if a BTC address belongs to a certain wallet? Like for example i know the electrum Master Public Key of the recipients wallet and want to check if the BTC address I have is really from his wallet?

thx

PP

[peterpan7]

a little background: im a merchant and accept bitcoin payments. the addresses are created with an electrum MPK. I want to give my customers a possibility to doublecheck if the address where he is about to send his payments to, is really from my wallet. In case my webshop gets compromised a hacker might change the displayed btc addresses. fairly unlikely, but if the customer wants to be 100% sure he could see my pgp signed MPK, and check if the btc address really belongs.

It would be sufficiant if the customer can enter the mpk somewhere and create addresses, so he could check if the btcaddress apears in the list. I have seen php scripts creating addresses from the mpk, but no website where you can just enter the MPK and display the correspondant addresses. I could implement this feature myself into our shop, but that wouldnt give any extra safety, it has to be a third party like a different website from ours to be sure that the output is real.

Is there an electrum command where you can display btc addresses from an MPK of somebody elses wallet?

would be happy if anybody has an idea how i could give my customers a possibility to doublecheck the given addresses somehow, for their and my own safety.

[shorena]

I think what you want is to sign a msg with your key https://en.bitcoin.it/wiki/Electrum#List_of_commands
and let the customer verify that with their respective wallet programm.

[jonald_fyookball]

I don't think this makes a whole lot of sense.
 
How would you get your customers to store your
MPK and use it to verify?  If hackers got your site
they could make a new MPK and publish that.

The only thing that makes sense is if Electrum
had some feature to store other people's MPKs
and then check them , but it doesnt have
this security feature.

[dabura667]

It is not a good idea to give out the master public key, as anyone with the master public key could calculate your master private key by just compromising one private key on the chain.

You should think of another method of security for your site.