METHOD, ELECTRONIC ACCOUNT SETTLEMENT SYSTEM, COMPUTER PROGRAM, ISSUER, ACCEPTER, VALIDATOR AND EMITTER (METHOD FOR AUTOMATICALLY CHECKING VALIDITY OF TRANSACTION, ELECTRONIC PAYMENT SYSTEM AND COMPUTER PROGRAM)

摘要

PROBLEM TO BE SOLVED: To provide an improved secure and anonymous transaction system and transaction method.

SOLUTION: A validity checking method is provided for automatically checking validity of transaction among an issuer having signature keys pkB, skB, an emitter having emitter keys pkU, skU, an accepter having unique identity idMand a limit NMto transaction, and a validator. An electronic account settlement system 100 including a bank computer system 101, a user computer system 102, a store computer system 103 and a validator computer system 101, a computer program and a computer program product are further provided.

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