BlockTac fights fake consumer products and data with our single-use digital seals registered with Blockchain technology, designed for brand protection and consumer engagement, and with our Blockchain-of-things devices, that communicate directly with IoT sensors, encrypt the data, and store it in a public Blockchain. The information now becomes trusted and traceable, impossible to change, truly linked to its source. Now it is impossible for third parties to impersonate the real producers of the data, helping the training of AI systems, and reducing energy consumption. Privacy is fully protected, and potential scammer immediately identified.