| 摘要 |
Decentralized storage of electronic receipts for sharing transaction histories. Merchants generate and digitally sign the electronic receipts for transactions involving electronic content products. The electronic receipts for a user are stored by the user. The user later presents other entities with the electronic receipt as proof of the transaction. The merchants also maintain “graveyard lists,” or lists of cancelled transactions that are used by other merchants to determine whether a particular transaction is still valid. For example, if the electronic content product associated with the particular transaction has been returned or exchanged, the particular transaction is added to the list of cancelled transactions.
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