IoTeX is the privacy-centric blockchain backbone for the Internet of Things (IoT), offering a decentralised network where users can interact with IoT devices securely and privately. Launched in 2017, it introduces a unique blockchains-in-blockchain architecture to tackle the scalability and privacy challenges inherent in IoT. IoTeX leverages innovations such as constant-size ring signatures for confidentiality and a fast consensus mechanism for speedy transactions with instant finality. It's not just a secure ledger, but a platform designed for the proliferation of IoT applications spanning various sectors, embodying principles tailored for IoT’s unique needs: privacy, scalability, and interoperability. IoTeX presents a new paradigm for the rapidly expanding realm of connected devices, where trust and privacy are paramount.