Currently transaction fees in ZEC only contribute to funding miners and dev fund. But what about services that want to charge a native ZEC fee for their services?
As an example, many exchanges generate profit through fees for each transaction. Sometimes these fees are:
Implicit through a spread.
Explicit using one side of the pair as the fee currency.
Explicit using an exchange specific token (that may have been intially sold to investors. e.g. ICO token).
Explicit using the native blockchain currency (e.g. BTC, ETH, ZEC…).
With the development of ZSAs well underway I imagine in the first instance exchanges will charge fees through a spread. Have we thought into what features Zcash would need to enable for 2, 3, and 4?
Exchanges aren’t the only service that may want to enable this kind of business model. Maybe a point of sales system wants to subsidise hardware costs by charging a small on-chain transaction fee. Maybe a crowdfunding site wants to be explicit about their fees. I’m not 100% sure what this looks like but it feels a little “atomic ops”. Also as stated in the exchanges example I think it’s beneficial for ZEC if we allow exchanges to charge an extra ZEC fee rather then only allowing service providers to charge fees in the underlying ZSA exchange pair. Thoughts?
P.S. I’m well aware we probably don’t want to contribute negatively to the privacy of Zcash by adding this fee publically to the blockchain transaction fee so maybe it’d have to make it private as part of the transaction…?
Wouldn’t this be enabled at the service provider side, by creating a Payment URI with multiple recipients of the transaction? This way one of the outputs could go to the exchange for fees, directly from the end-user(sender).