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We present a new 4-move special honest-verifier zero-knowledge proof of knowledge system for proving that a vector of Pedersen commitments opens to a so-called ``one-hot'' vector (i.e., to a vector from the standard orthonormal basis) from $\mathbb{Z}_p^n$. The need for such proofs arises in the contexts of symmetric private information retrieval (SPIR), end-to-end verifiable voting (E2E), and privacy-preserving data aggregation and analytics, among others. The key insight underlying the new protocol is a simple observation regarding the paucity of roots of polynomials of bounded degree over a finite field. The new protocol is fast and yields succinct proofs: For vectors of length $n$, the prover evaluates $\Theta(\lg{n})$ group operations plus $\Theta(n)$ field operations and sends just $\Theta(\lg{n})$ group and field elements, while the verifier evaluates one $n$-base multiexponentiation plus $\Theta(\lg{n})$ additional group operations and sends just $2(\lambda+\lg{n})$ bits to obtain a soundness error less than $2^{-\lambda}$. (A 5-move variant of the protocol reduces prover upload to just $2\lambda+\lg{n}$ bits for the same soundness error.) We have implemented both our new protocol and its closest competitors from the literature; in accordance with our analytic results, experiments confirm that the new protocols handily outperform existing protocols for all but the shortest of vectors (roughly, for vectors with more than 16-32 elements).more » « less