I've thought about something like this. In my mind it all comes down to receipts. We need a system of ubiquitous standardized itemized and cryptographically signed digital receipts. That way everything you buy aggregates into your personal inventory app. Then making a posting is a matter of one click and one photo. The UPC in receipt means a full product listing can be generated automatically. This is crucial since m…
Besides, who keeps receipts for anything but expensive items that might need warrantee? Most people don't. Sometimes you acquire something through different means: presents, inheriting, thrift shop, etc.
And that's avoiding the huge privacy matter of buying something with a unique tracking number attached and linked to you.
1: I'll take mine without hypothetical sugar please.