This study introduces an energy-efficient framework for securing multimedia applications in mobile cloud environments using blockchain-based integrity verification. Traditional data security and verification methods often increase energy demands, especially for multimedia files. To address this, our model leverages lightweight Proof-of-Stake (PoS) consensus and Merkle Tree-based verification to ensure data integrity with minimal energy consumption. Multimedia content is stored off-chain, with only the encrypted data’s hash maintained on-chain, optimizing both storage and verification processes. Energy-efficient Elliptic Curve Cryptography (ECC) enhances security without compromising performance. Our simulations, measured with tools like Power-Tutor and Energy-Box, show that the proposed system significantly reduces energy use across consensus, encryption, and verification stages. This framework provides a scalable, energy-conscious solution for mobile multimedia applications, promoting sustainable data management in mobile cloud computing.