This paper aims to develop a reputation-based, decentralized system using Blockchain to optimize the KYC process. The system will aim to optimize the core know-your-customer (KYC) verification process for financial corporations and improve the customer experience by reducing costs and increasing transparency of the data shared. The current KYC process costs more than $500 million for banks, most of which is spent to secure the customer's personal data. In the proposed system, the KYC verification process will only be conducted once for each customer by a validator in the Blockchain, regardless of the number of financial corporations with which that customer intends to work. Owing to Blockchain, the core KYC verification result can be securely shared by the customers with all the financial corporations that they intend to work with. This process produces a gain in efficiency, reduces cost, improves customer experience, and increases transparency throughout onboarding a customer for the financial corporation.