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They don't depend on the blockchain, but the fact is that most recent research on these topics has come from the blockchain/cryptocurrency space.

One interpretation is that crypto companies need security and privacy, while big tech doesn't seem to care all that much.

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uh... so you're saying hypothetical coinbase cares more about security than hypothetical robinhood or fidelity, or even the good ol' google/apple?

(i'm having a hard time thinking of a successful "crypto" company other than a handful of exchanges, of which coinbase will probably be the only one that survives, at least in the US)

I don’t know if “cares about” is the right phrasing, but financial transactions are a “simple” use case for ZK algorithms. So practicality if implementation definitely affects how much a group or company cares.

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