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When installing the zcash client for the first time it downlods a bulk of around 900 MiB in zkSNARK parameters. I am wondering: why and what are they exactly used for? Is this a security feature? How to verify the parameters?

What are zkSNARK parameters and how to verify them?

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It's basically a zero knowledge proof that is easy to verify. The parameters are given on the zcash site. you can check it here
https://z.cash/blog/generating-zcash-parameters.html

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  • Welcome to Bitcoin Stack Exchange! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Afr Oct 25 '16 at 8:57

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