Proof of Freezing Time Algorithm Based on IOTA with Hierarchical Structure
Yuxin Xu, Bidi Ying · 2021 IEEE 21st International Conference on Communication Technology (ICCT) · 2021
IOTA is the most widely used blockchain technology in Internet of Things (IoT) but it uses Proof-of-Work (PoW) algorithm to avoid attacks from malicious nodes, which is a big burden for resource-constrained IoT devices. To solve this problem, we present a Proof of Freezing Time (PoFT) algorithm based on IOTA network with hierarchical structure. We propose a credit value-based PoFT algorithm for agent nodes, which reduces the energy consumption of agent nodes while achieving the balance of security and efficiency of IOTA. In order to reduce the amount of communication between agent nodes and gateways, we adopt a hierarchical structure in IOTA, which also reduces the dependence of agent nodes on gateways. Simulation results show that credit value-based PoFT algorithm and hierarchical structure are effective in IOTA.