Design and Implementation of Trustzone-Based Blockchain Chip Wallet

With the rapid development of the digital currency market, the security of transactions is constantly challenged, and a blockchain chip wallet security trading system based on TrustZone is designed. The system uses OP-TEE (Open-source Portable Trusted Execution Environment) to build a trusted execution environment, encrypt the private key with secure storage functions and store it in secure files, isolating user applications and wallet. Through the guidance of dirf.db file, the private key location of the security file is protected, and multi-level data protection and transaction security are realized. Compared with the traditional hardware wallet scheme, the proposed system retains the characteristics of hardware wallet security isolation and realizes chip-level transaction security with simplicity and portability.