Nowadays, digital evidence plays a significant role in criminal investigations due to the widespread use of technology in daily life. As in the case of physical evidence, digital evidence requires suitable and secure handling and storage processes to guarantee its integrity and be admissible in a court. This paper presents a blockchain-based integrity-proof system that leverages the security features of Hyperledger Fabric to enable secure and reliable evidence. This system also enhances the usability of the blockchain technology, allowing authorities with no technical knowledge to use it. The design and specific implementation are described in detail, resulting in a real prototype for a reliable, secure, and user-friendly criminal evidence integrity-proof system. This system has been successfully used in the analysis of car accidents, resulting in a very useful tool for securing car accident 3D reconstruction and energetic analysis.