Evidence collected from a scene of crime is crucial in solving the crime and providing justice to the parties involved. Hence, preserving evidences from any form of contamination is necessary. Chain of custody is the documentation of the evidence by every personnel that handles it, from the collection point until the court of law. If the chain of custody is not maintained, the evidence will be rendered inadmissible in court, which can jeopardize eventually the entire case. Blockchains are distributed digital ledgers of cryptographically signed transactions in chronological order that are grouped into blocks and can be viewed by any node in that particular blockchain network. Ethereum is a distributed public blockchain network which focuses on running programming codes of any decentralized application. One of the major benefits of this blockchain mechanism is that it is very secure because of the use of smart contracts, and it cannot be changed or manipulated. In this study, we have implemented Ethereum blockchain for digitalizing the chain of custody process to ensure security, greater trust, and increase the efficiency of the process.