“One day, ZK-proofs could help convince your bank that your income is above a certain threshold — to qualify for a mortgage, for example — without revealing your actual income. Or prove to the election authorities that you are a resident or citizen without giving them your name, driver’s license or passport.”
An interesting read on the use cases of ZK-proofs, how they are developing, and their on- and off-chain applications.
https://cointelegraph.com/magazine/crypto-zero-knowledge-voting-finance/