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I am new to the world of Zero Knowledge Range Proofs. I read the following on GitHub: https://github.com/ing-bank/zkproofs

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:

  1. Validate that someone's age is between 18 and 65 without disclosing the age.
  2. Validate that someone is in Europe without disclosing the exact location.

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.

Any idea about the provided example that of the commitment can be verified on etherum or any link to a technical paper that describes how a user TP commit to a user age, then the blockchain can verify that commitment ?

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  • That's a very good question. I quickly went through the paper. They talking all the time about a "commited number", but they are not explaining what it means exactly. It could be anything like a hash or a salted hash or whatever... with zokrates for instance you could have a salted hash onchain endorsed by an authority, and then you can make a zks proof that you know the salt and the age corresponding to the salted onchain hash without revealing the salt or the age itself. – ivicaa Jan 31 '19 at 20:09

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