Re: [Taler] How to trust an auditor?

[Sebastian Javier Marchano]

> I plan (for learning purposes) to create a setup with two different exchanges; payer and payee would have their accounts at different exchanges then.

I will assume that payer and payee are users with a wallet. Wallets don't have accounts at exchanges, rather they have coins signed from exchanges. So the correct term will be "payer and payee have coins withdrawn from different exchanges".

> Does this currently work already?

Yes, two exchanges with different bank accounts.

> How is trust established here?

Wallet will trust different exchanges, no big deal here. You may also have the two wallets have coins from both exchanges.

> Does the payee need to trust the payer's exchange, or do only the exchanges need to trust each other (e.g. by configuration)?

Let's say that wallet A withdraws coins from exchange X.

and wallet B withdraws coins from exchange Y.

You want to send the coins from wallet A to wallet B.

Wallet A will instruct the exchange (it just have coins from exchange X) to create a reserve and then will send the instruction (as a QR code or taler:// URI) to wallet B

This coins then will be withdrawn from exchange X so wallet B will need to accept terms of service of exchange X (and trust that exchange).

The operation is called pay-push (peer-to-peer transfer) [1]

Also exchange-to-exchange may be possible in the future, but currently in our roadmap and not yet implemented.

[1] https://docs.taler.net/design-documents/013-peer-to-peer-payments.html

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Sebastian

On Sun, 13 Nov 2022 at 22:12, Florian Jung via Taler <taler@gnu.org> wrote:

Hi Sebastian,

thank you for that quick reply! :)

I plan (for learning purposes) to create a setup with two different exchanges; payer and payee would have their accounts at different exchanges then.

Does this currently work already? How is trust established here? Does the payee need to trust the payer's exchange, or do only the exchanges need to trust each other (e.g. by configuration)?

Florian

On 11/14/22 02:06, Sebastian Javier Marchano wrote:

Hi Florian,

you've got it right, exchange and auditor management is in our roadmap but not implemented yet.

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Sebastian

On Sun, 13 Nov 2022 at 21:59, Florian Jung via Taler <taler@gnu.org> wrote:

Hi!

As I read through the exchange setup manual, I found out that I can /
need to(?) sign my exchange's keys with an auditor key. To me, this
kinda makes sense in a real-world scenario, because I don't want to
trust every single bank by its own, but I would like to trust, for
example, "the euro-zone's auditor" (and every bank that is audited by them).

However, how do I configure this in my Android wallet? I found a list of
exchanges, but is there also a way to set up a certain auditor as trusted?

Or did I misunderstand the purpose of these auditors?

Best regards,

Florian