Matthew Green on Nostr: Building these models fundamentally depends on access to extremely private data, like ...

Building these models fundamentally depends on access to extremely private data, like your browsing habits or location data or purchasing history. This is the kind of stuff you think is private, and even US companies used to think twice about selling.

Adding a veneer of cryptographic privacy to these systems makes the medicine go down easier. Your credit card company might not sell your raw purchase data. But apply magical “privacy pixie dust” so no individual data affects the result? Now the data can be monetized. It’s a very compelling story, and one that’s proliferating.