Control method, information processing device, management system, and recording medium

An information processing device that controls, using a distributed ledger, locking or unlocking of one or more storage units, in each of which an item is storable, the information processing device being one of a plurality of information processing devices, the information processing device comprising:

• a processor;
• a memory;
• and
• a storage device in which the distributed ledger is stored, the distributed ledger storing a code, wherein
• the processor operates a first smart contract and one or more second smart contracts by the code, stored in the distributed ledger, being executed using the memory, the first smart contract managing the one or more second smart contracts that are in one-to-one correspondence with the one or more storage units,
• each of the one or more second smart contracts controls, under the management by the first smart contract, locking or unlocking of a corresponding one of the one or more storage units, and
• the first smart contract controls whether to place each of the one or more second smart contracts under the management.