September 27, 2021

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HashWires: Hyperefficient Credential-Based Range Proofs, by Konstantinos Chalkias and Shir Cohen and Kevin Lewi and Fredric Moezinia and Yolan Romailler

This paper presents HashWires, a hash-based range proof protocol that is applicable in settings for which there is a trusted third party (typically a credential issuer) that can generate commitments. We refer to these as “credential-based” range proofs (CBRPs). HashWires improves upon hashchain solutions that are typically restricted to micro-payments for small interval ranges, achieving an exponential speedup in proof generation and verification time. In terms of proof size and computational cost, we show that HashWires compares favorably against Bulletproofs for both 32- and 64-bit numeric values. Although CBRPs are inherently less flexible than general zero-knowledge range proofs, we provide a number of applications in which a credential issuer can leverage HashWires to provide range proofs for private values, without having to rely on heavyweight cryptographic tools and assumptions.