1 & x_2 - x_0 & x_2^2 - x_2 x_0& \dots & x_2^n - x_2^{n-1} x_0\\
The ZK-proof approach also addresses the efficiency limitation of the basic single-use credential: here the same credential can be re-used to make power many “show” protocols, without making each on linkable. This property stems from the fact that ZK proofs are normally randomized, and each “proof” should be unlinkable to others produced by the same user.2
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