Abstract: A method is disclosed for verification of environmental data relating to the conditions under which perishable goods are stored and/or transported. The method comprises measuring, by one or more sensors employed by storage facilities, a physical quantity that relates to environmental conditions to which the perishable goods are subjected to; receiving, at a plurality of computing devices, data descriptive of the measured physical quantity; checking the validity of the received data by at least one of the plurality computing devices to determine if the conditions relating to a smart contract are met; and to ensure data integrity, creating, transmitting and storing transaction data relating to the received environmental data in a plurality of distributed public ledgers, if the received environmental data is found to be valid, wherein the plurality of distributed public ledgers are part of a blockchain system and the transaction data are stored in a blockchain.