ProofOfFunds
Mobile app that generates ZK proofs of crypto balances without revealing exact amounts
Demo
About
Proof of Funds is an Android mobile application that leverages Zero-Knowledge (ZK) cryptography to allow users to prove they possess certain cryptocurrency balances without revealing their exact wallet amounts, addresses, or transaction history. This creates a new paradigm for privacy-preserving financial verification in the Web3 ecosystem. The Problem: In traditional financial systems, proving you have sufficient funds requires revealing sensitive information - your exact balance, account details, and often your entire transaction history. This creates privacy concerns and security risks. The Solution: Zero-Knowledge proofs enable users to cryptographically prove they meet certain financial criteria (like having a minimum balance or being in the top percentage of holders) while keeping all other information completely private. This project represents a significant advancement in privacy-preserving financial verification. By combining Zero-Knowledge cryptography with mobile blockchain technology, it enables a new class of applications where users can prove financial capacity without compromising privacy. This has profound implications for DeFi, DAOs, institutional crypto adoption, and the broader Web3 ecosystem. The application demonstrates how cryptographic primitives can be made accessible to everyday users through intuitive mobile interfaces, bridging the gap between advanced cryptography and practical financial applications.
How it's made
Android Development Stack Kotlin: Primary language for all Android components Jetpack Compose: Modern declarative UI framework for native Android development Navigation Compose: Type-safe navigation between screens ViewModel + StateFlow: Reactive state management with lifecycle awareness Material Design 3: Modern design system with dynamic theming Zero-Knowledge Cryptography Circom: Domain-specific language for writing ZK circuits Mopro: Rust-based library for generating ZK proofs Rust FFI: Foreign Function Interface to bridge Rust cryptographic code with Kotlin WebAssembly: Compiled circuit execution for cross-platform compatibility Blockchain Integration MetaMask Android SDK: Official SDK for wallet connectivity Ethereum JSON-RPC: Direct blockchain communication Web3j: Java/Kotlin Ethereum client library Smart Contracts: Solidity contracts for proof verification This project represents a sophisticated integration of modern Android development practices with cutting-edge cryptographic technologies, demonstrating how complex ZK proofs can be made accessible through intuitive mobile interfaces.