This article introduces a secure and efficient framework for the storage and validation of medical images using the Ethereum blockchain platform, incorporating the decentralized capabilities of the Interplanetary File System (IPFS) and digital signature methodologies employing zero watermarking. Medical images are critical to patient diagnosis and treatment, necessitating robust security measures, especially during transmission over insecure networks. Our approach utilizes chaotic sequences and transformations through Integer Wavelet Transform (IWT) and Singular Value Decomposition (SVD) to create a digital signature that ensures the integrity and privacy of the images without modifying their content. The solution encrypts medical images before storing them in IPFS with their corresponding digital signatures to safeguard confidentiality. Upon access, the images are decrypted and their signatures are checked to confirm their integrity. The effectiveness of this methodology is demonstrated by its strong resilience to network disturbances and potential security threats, achieving an average Normalized Correlation (NC) value of 0.97. This performance underscores the potential of integrating advanced cryptographic techniques with blockchain technology to enhance the security of medical image data.