AI for Blockchain -- A General Smart Contract Vulnerability Detection Framework with Self-Attention Graph Pooling -- The Best of Both Worlds: Integrating Semantic Features with Expert Features for Smart Contract Vulnerability Detection -- A LSTM and GRU-based hybrid model in the Cryptocurrency price prediction -- Smart Contract Code Clone Detection Based on Pre-Training Techniques -- MF-Net: Encrypted Malicious Traffic Detection Based on MultiFlow Temporal Features -- Blockchain Applications -- When Supply Chain Security Meets Blockchain: Applications and Challenges -- ePoW: Energy-efficient Blockchain Consensus Algorithm for Decentralize Federated Learning System in Resource constrained Drone Swarm -- Applications of Consortium Blockchain in Power Grid Security: A Systematic Review -- Blockchain and OR based data sharing solution for Internet of Things -- Rearranging Inv Message in the Bitcoin to Construct Covert Channels -- Long-term Blockchain Transactions Spanning Multiplicity of Smart Contract Methods -- Market Derivative Risks and Regulation of Virtual Currency Trading Using "PaoFen" Platforms -- Research on Regulation Oriented Decentralized Oracle Machine -- Obric: Oblivious Keyword Search in Hyperledger Fabric Platform -- Blockchain Architecture and Optimization -- A distributed, penetrative and all-dimensional supervision architecture for consortium blockchain -- SC-Chain: a multi-modal collaborative storage system for medical resource -- Congestion Control with Receiver-aided Network Status Awareness in RDMA Transmission -- VPBFT: Improved PBFT consensus algorithm based on VRF and PageRank algorithm -- Consensusless Blockchain: A Promising High-Performance Blockchain without Consensus -- Protocols and Consensus -- Ouroboros Taktikos: Regularizing Proof-of-Stake via Dynamic Difficulty -- Petrichor: An Efficient Consensus Protocol Leveraging DAG and Sharding for Asynchronous BFT -- A Kind of Optimization Method for Committee and Reward Mechanism -- MagpieBFT: An Efficient Asynchronous BFT Protocol for Blockchain -- A Hierarchical Blockchain Framework with Selectable Consensus Scope for Data Sharing in Internet of Vehicles -- An Improved PBFT Consensus Algorithm for Supply Chain Finance. .

The two-volume set CCIS 1896 and 1897 constitutes the refereed post-conference proceedings of the 5th International Conference on Blockchain and Trustworthy Systems, BlockSys 2023, which took place in Haikou, China during August 8-10, 2023. The 45 revised full papers presented in these proceedings were carefully reviewed and selected from 93 submissions. The papers are organized in the following topical sections: Part I: Anomaly detection on blockchain; edge intelligence and metaverse services; blockchain system security; empirical study and surveys; federated learning for blockchain. Part II: AI for blockchain; blockchain applications; blockchain architecture and optimization; protocols and consensus.