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An innovation in Japan which I think will arrive everywhere: double-blinded shipping, where neither the sender nor receiver know each other's address. This was negotiated by a large marketplace (Mercari), which didn't want to have to walk so many users over the privacy hump.
"How does this even happen?" Mercari gives you a number, which they've arranged via API with the logistics company. You give the number to your local convenience store or post office; they put a machine-readable label on it. It contains a pointer to a DB record.
This enables a *much more important* innovation than double-blind addressing, which is virtual addressing. DNS for mail. You should be able to send @patio11 a package or letter. I'm at where I'm at; I should not need to update every company in world every time that changes.
(Somewhat incredibly to me, Kuroneko will definitely let me redirect any package to @patio11 to my office or local convenience store via the web app, and I think they may eventually extend that to a virtualization layer, bootstrapping off the physical address they know I control)