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A blind signature ensures that the server never learns which message it’s signing. A partially-blind signature protocol allows the server to see a part of the message, but hides another part. For example, a partially-blind signature protocol might allow the server to see the driver’s license data that it’s signing, but not learn the value K that’s being embedded within a specific part of the credential. A second way to accomplish this is for the User to simply commit to K (e.g., compute a hash of K), and store this value within the credential. The ZK statement would then be modified to prove: “I know some value K that opens the commitment stored in my credential.” This is pretty deep in the weeds.
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So while Meta claims that users' own recordings are kept private, footage that is captured but not stored locally for users — like video when Live AI is in use — can be sent to contractors who help train the company's AI models. Meta's privacy policy doesn't specifically mention the use of human contractors, though it states that such data can be used for training purposes.，更多细节参见im钱包官方下载
https://www.ign.com/articles/2012/06/20/no-upgrade-to-windows-phone-8-for-current-wp7-owners