App developers face a regulatory squeeze: they need to verify user ages to comply with laws like COPPA and avoid liability, but traditional verification methods are terrible. Uploading IDs kills user conversion rates, creates massive privacy risks by forcing companies to store personal documents, and requires custom engineering work for every new state regulation. The article proposes Aevum, a developer SDK using zero-knowledge proofs to prove someone meets an age threshold (like being over 13 or 18) without the user's actual identity data ever leaving their phone. The cryptographic proof happens locally on the device, so developers get regulatory compliance without handling or storing any PII. The business model stacks three revenue streams: $0.03–$0.10 per proof verification, a $499/month enterprise tier for dedicated key management and audit logging, and $0.05 per parental consent request routed through the system. Aevum plans to acquire developers through a free compliance sandbox that tests existing onboarding against current laws, targeted guides for specific regulations and tech stacks, and open-source middleware contributions to popular frameworks. The competitive advantage comes from being embedded deep in an app's authentication layer—switching providers would require rebuilding onboarding and redoing compliance audits. There's also a network effect: users verify once and carry that proof across partner apps. The timing works because regulatory pressure is real (Meta's recent settlement proves it), and the technology finally exists. Modern phones can run complex zero-knowledge cryptography circuits in milliseconds using WebAssembly. The article includes a rough technical blueprint: use Circom and SnarkJS compiled to WebAssembly for client-side proof generation, a stateless Rust verification service on Lambda to validate proofs against digital credential issuers like mobile driver's licenses, and Supabase, Clerk, and Stripe to handle the backend infrastructure.