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

An information processing device that is one of a plurality of information processing devices and controls locking or unlocking of storage using a blockchain, the information processing device comprising:

• a processor;
• memory;
• and
• a storage device that stores a distributed ledger in a form of the blockchain, wherein
• the blockchain stores keyholder information indicating a person having authority to lock or unlock the storage, and
• the processor, using the memory:
• determines, when first request information indicating a lock/unlock request is received from a terminal, whether or not a keyholder identified by reading the keyholder information stored in the blockchain matches an owner of the terminal that has transmitted the first request information, the lock/unlock request being a lock request or an unlock request;
• performs lock/unlock processing when the keyholder is determined to match the owner, the lock/unlock processing being processing for causing the storage to lock or unlock in accordance with the first request information;
• and
• performs first storage processing after the lock/unlock processing is performed, the first storage processing being processing of storing, in the blockchain, transaction data indicating that the lock/unlock processing has been performed.