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At Dusk Network we’ve developed the open-source PLONK zero-knowledge proof system. It uses a trusted app that only you can control (e.g. your mobile bank app or a Govt ID app) to produce a committed value. This committed value holds the key information about your income statement (which this agency warrants is true), and you use this value to prove via the zero-knowing proof system to the verifier (i.e. the housing agency) that you are eligible for the house.