https://mytrezor.com down ?
Makes me consider Electrum even more, just not sure about the privacy that way.
If you want privacy, use Trezor on Android with Mycelium through Tor.
Rassad, so Mycelium servers can see all our tx's and balances, right?
Anyone or any server/entity who has/gets your xpub can calculate and see your entire xpub public sequence. Therefore, they can see all of your current public addresses, all of your previously used public addresses and all of your transactions on all the addresses generated by that xpub.
I don't see this as an issue for a miner giving an xpub key to the mining pool they use. The mining pool will be able to calculate the entire public key sequence and should use a different public key each time they send a payment. So they can calculate and see the entire history of payments - but of course they already know that history because they are the one who made all the payments.
In other words giving out a separate xpub to each entity that gives you periodic payments would not compromise your privacy.
However, the point of the original question is a good one. You should be careful who gets the xpub key from your Trezor account(s) as whoever that is can calculate and see the entire history of transactions generated by that xpub. That is exactly how myTrezor.com can calculate your entire transaction history every time you plug your Trezor into the web site.
