Blockchain-Based Iris Authentication in Order to Secure IoT Access and Digital Money Spending

In this work we use two approaches to prevent double spending and secure IoT transaction through Blockchain and information fusion techniques: the first method is based on Smart Contracts; while the second method is implemented by a novel Blockchain system. Both methods use a hybrid RSA and biometric codes fusion in order to have an encrypted, taking account of the privacy, identity of the spender. In Blockchain a contract between the parties is stipulated and the biometric fused code are kept. The used coin pack is tagged, so a future double spending or any illegal action on the IoT network or Smart city becomes forbidden and prosecutable legally. The second part of the work will present a novel Blockchain where a transaction can be signed only if the user is successfully authenticated though his biometric fused key.