Blockchain technology has enabled decentralized, transparent, and immutable transaction mechanisms, transforming digital financial systems. This paper describes the design and implementation of a decentralized crowdfunding platform based on smart contracts and the Ethereum blockchain. The system uses Solidity for contract development and Ganache for local testing, which are combined with MetaMask for safe transaction handling. To boost performance, transaction time was reduced from 18 to 10 s, increasing system throughput and lowering gas costs. Security features such as transaction verification via SHA-256 hashing and decentralized transaction logging were also implemented to ensure integrity and transparency. A comparison with existing systems reveals the proposed platform’s advantages in transaction efficiency and operational transparency. Future improvements will include scalability optimization and integration with decentralized identity frameworks.