Hello norman0,
Thank you for taking the time to share these 2 observations.
Regarding delivery, this will depend on how and where the transaction take place. For deliveries of a physical product within a local community, experience shows that these deliveries often happen in person, having no need for a third-party system to receive or store information. For deliveries which require shipments, our intention is to dissociate ourselves as much as possible from that process so the required information would be managed directly between users without specific ties to an existing transaction on our end.
Regarding legitimacy of the sellers (and buyers on some aspects): this is a very critical point. Our roadmap includes an escrow and dispute resolution mechanisms. The main difference is that we believe these mechanisms can be handled by the parties themselves with clear and defined rules set on the onset and don't necessarily need to be managed centrally as the number of use cases is limitless. There shouldn't be a one size fits all mechanism here but the flexibility to let people choose how they want to handle their transactions (with some recommendations to help users take the proper decisions). We also believe that the community can play a better role in dispute resolutions and be incentivized to do so through several mechanisms.
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In the end, you will submit personal information regarding the delivery. It is unavoidable. It just depends on this site whether it has some kind of database to record and store those addresses.
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without the control or supervision of a centralized infrastructure for their commercial transactions.
How to ensure the legitimacy of the sellers? In general, the marketplace acts as an escrow to secure buyer funds. If the user has full control, does that mean you don't want to interfere with user problems? I've read your WP (p. 7, "Additional protections for buyers and sellers"), but found no explanation of your role as a protector if users have issues, especially fraud.