uncleflo
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Zero Knowledge Range Proof
Saved by uncleflo on December 28th, 2017.
ING's zero knowledge range-proof precompiled contract for the go-ethereum client. One fundamental concern in blockchain technology is the confidentiality of the data on the blockchain. In order to reach consensus between all independent nodes in a blockchain network, each node must be able to validate all transactions (for instance against double-spent), in most cases this means that the content of the transactions is visible to all nodes. Fortunately several solutions exist that preserve confidentiality on a blockchain (private transactions, HyperLedger Fabric Channels, Payment Channels, Homomorphic encryption, transaction-mixing, zero knowledge proofs etc.). This article describes the implementation of a zero-knowledge range-proof in Ethereum. The zero knowledge range proof allows the blockchain network to validate that a secret number is within known limits without disclosing the secret number. This is useful to reach consensus in a variety of use cases: Validate that someone's age is between 18 and 65 without disclosing the age; Validate that someone is in Europe without disclosing the exact location; Validate that a payment-amount is positive without disclosing the amount (as done by Monero). The zero-knowledge range-proof requires a commitment on a number by a trusted party (for instance a government committing on someone's age), an Ethereum-user can use this commitment to generate a range-proof. The Ethereum network will verify this proof.
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