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Re:Ask HN: [Validating app idea] An app which allows you to ... by smt88 on Tuesday June 27, 2017 @03:03PM (#14648228)
1) No.

2) No. I can't imagine people using an app that has auctions that can't be enforced. The element of trust/enforcement is crucial.

Questions for you:

1) Are you talking about a native app? If so, why native?

2) How does this solve a problem that eBay doesn't solve?

Re:Ask HN: [Validating app idea] An app which allows you to ... by black_blood on Tuesday June 27, 2017 @03:19PM (#14648418)
1) I am thinking about a web-app for now. 2) eBay's private listings is different. All the users can bid in an eBay auction. In eBay's private listings, just the username is kept confidential. Whereas with my app, only the users invited will be able to bid.

You talked about element of trust/enforcement. The one who is creating the auction is inviting people by their email. So, he will invite only those people who he trusts.