Quote from: stompix on June 16, 2021, 11:53:58 PM

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The attacker brings 10 000 satoshis to the table, he receives the same amount in SABU

If you intended a malisciuos "issuer" as an attacker, your asumption is wrong, since in Sabu transaction standards Issuer can sign maximum 20,000 Satoshi as his debt and for this transaction the issuer must spend a UTXO worth at leaset 40,000 Satoshi. Each Main Transaction(MT) has to pay fixed 10,000 Satoshi as Bitcoin transaction fee despite the length of transaction or amount of transaction. So your cheating scenario fails. It is almost what you sugessted

please study the images (6. Aggregate credits and 3. Transaction in detail).
But! who is going to entrust you with twice the amount of bitcoins just to be able to spend on that amount in a token

Please re-read the proposal main idea. There is no "token". it is just Bitcoin and valid Bitcoin transactions. The only thing is different is the amount of outputs. Issuers sign transactions and earn very small fees(10 Satoshi per transaction) but they can handle thousands of transactions per day and by this earn a significant income which incentivize them to use this system, on the other hand the creditors can buy (and transfer) small amount of Bitcoin(even under 5$) with no dependency to exchanges or KYC or high transaction fee. It would be a mechanism for small saving and once the creditor has enough funds(near one or thousands of different issuers), he can transfer it to Bitcoin blockchain.

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So either the risk of google disabling my accounts as it doesn't like those mails or pay for a paid email service that would cost me more than the fees.

The email service cost will be 20$ per year or less. Meanwhile Email can be replaced (or pralelly exist) by central servers or some peer-to-peer IP based system. It is only a communication mechanism which I still prefer email because I have a particular point of view about this project and its future features. So some third parties can easily provide the communicate service for wallet.

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you should really look at it from the perspective of the customer! What would the average Joe think of this?

The system must be super user friendly, the average joe will not aware of all these complexities. He know his friends email and add them to his wallet and starts to send and receive funds. All these complexities are behind the scene and on our technical shoulder. We are here to make the things make the life easier for people.