February 15, 2021 // By Nick Flaherty ETSI GR PDL 004 defines an architecture and functional framework for blockchain smart contracts and permissioned distributed ledger technology in the Internet of Things European standards group ETSI has launched a guidlies for using blockchain distributed ledger technology in sensor networks and the Internet of Things. The ETSI Industry Specification Group on Permissioned Distributed Ledger (ISG PDL) has recently released a number of reports covering data record compliance to regulation, application scenarios and smart contracts. ETSI GR PDL 004 defines an architecture and functional framework for smart contracts and their planning, coding, and testing. The smart contract is a computer program stored in a distributed ledger system. Since smart contracts are code, if they are not well planned, designed, coded and tested, they can leave the system vulnerable to external attacks and internal errors.