Abstract: In the labor claim transaction system in response to a selection of a claim to be sold, a worker node notifies an employer node of a sale application, and records the buyer and the sale amount. When determining that there is no problem with the claim to be sold, the employer node records sale approval information in a distributed ledger, and notifies a buyer node of a sale approval notification. When determining that there is no problem with the claim to be sold, the buyer node records buying approval information in the distributed ledger, and notifies a financial institution node of the sale approval notification. The financial institution mode checks that the sale approval information and the buying approval information are recorded, and records sale amount transfer completion information.