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I’ll start working on this today.
In the event of a match any concerns with how we log the reward spend?
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Ideally: to not reverse dox your merchants, hash the list entries.
The log message back, its a bit broad. Ideally its a zero knowledge proof and a clear amount, but that's hard and not mature yet. For now, I'd just make sure that its encrypted and strip any data that you don't need. (After all, everything you don't know is something you're not liable for and cannot get subpoenaed for.)
That's something that ultimately you just want to disclose in docs / faqs. Just be precise about what you keep and why. This is the business in the end.
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We compare a receiving pubkey against our database of merchant pubkeys to determine if spend qualifies for rewards. If the receiver pubkey matches then we credit the
spend, if it doesn’t we do nothing.
Yes your Spark address is known to us. That is where we issue the rewards when we payout. Your Spark wallet works like an account. We don’t collect any emails or personal data.
Thank you for the criticism and concern. I definitely am always looking to improve. If you have a better design in mind please share.