Block-chain Blockchain 41 Smart contract 17 Distributed ledger 14 blockchain 14 Internet of things 10 Digital storage 7 Network security 7 Cryptography 6 Decentralised 6 smart contract 6 Blockchain technology 5 Data privacy 5 Supply chains 5 Internet of Things 4 Network architecture 4 Traceability 4 blockchain technology 4 Access control 3 Authentication 3 Costs 3 Detection methods 3 Distributed ledg technology 3 Electronic data interchange 3 Electronic document identification systems 3 Energy 3 Hyperledg fabric 3 Hyperledger Fabric 3 Peer to peer 3 Privacy protection 3