Web3 may have made zero-knowledge proofs headline-worthy, but the math was never chained to blockchains.  In 2025, regulatory pressure for privacy-by-design, relentless credential breaches, and the march toward zero-trust all push mainstream IT to adopt ZKP as a native control—long before most enterprises even mint a token. This post walks through the cryptographic intuition (with approachable numbers), showcases five Web2-centric use-cases that are shipping today, and explains how Lucenor’s applied-cryptography engineers translate elegant theory into hardened systems.