Frage zum Datenschutz: Mehrere Adressen in der Trezor-Brieftasche?

Idk about the whole “one sending address” thing. Doesn’t sound right to me but I don’t know.

What I DO know is that you can create as many wallets as you please with a Trezor and they are completely separate from each other. Passphrases allow you to do this very easily. Each seed+passphrase creates and entirely new wallet that would use a unique sending address for sure.

„accounts“ is what you are looking for.

While addresses from the same account can be linked in several ways, addresses from two separate accounts will stay separate and unlinkable, for as long as you don’t manually send your money between them. Label one account as „kyc“ and the other as „non-kyc“ and you’re golden.

(aside, it seems that people who come to Reddit with address privacy related reasons really hate accounts for some reason?)

You _can_ achieve the same by using different passphrases for the separation, but that adds hassle.

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The trick with sending addresses is that Bitcoin transactions are not „from address to address“ but „from multiple transactions to multiple (future) transactions“. When you want to send coins, you prove some transactions that you have previously received, generate one output point for the destination and one to send the remainder to yourself.

The „address“ is basically a placeholder that allows you to claim „this transaction was intended for me“. Which is why you use a different address every time: until you actually claim that transaction, it’s difficult to tell that it’s yours, because the address was never seen previously.

But the addresses are visible on chain, and whenever you spend multiple transactions with different addresses, that effectively tells the world that „these addresses belong to the same person“.

TL;DR There are no sending address, only transaction input.

When you are sending payment from bitcoin wallet (hardware wallet or software wallet) your wallet is signing a transaction which will contain all the necessary inputs.

So what are transaction inputs?

A transaction input is one of the outputs of an earlier transaction, so for example if you received 20mbtc few days ago and received 5mbtc at another time.

If you’ll try to send 21mbtc, your transaction will contain the two inputs

It will contain a list of transaction id’s and output number.
For example output #3 of txid aaa
and output output #5 of txid bbb

So some block explorers look which bitcoin address is associated with the transaction input and treats them as a sending address