Boosting additive circular economy ecosystems using blockchain: An exploratory case study

•A real case study related to a circular economy ecosystem is developed.•Plastic materials can be used as by-product in additive symbiotic networks.•The requirements for blockchain technology in an additive symbiotic network are proposed.•A permissioned blockchain supports the main activities in an additive symbiotic network.•Blockchain technology is an enabler for promoting additive circular ecosystems.