Transaction execution method and system

A transaction execution method wherein:

• (A) and (B) below are performed in a communication between a first participant terminal, which is any participant terminal, and a second participant terminal, which is any participant terminal other than the first participant terminal,
• wherein at least one participant terminal among a plurality of participant terminals stores verified transaction information to which is added a verified transaction object, which represents a transaction and is an object that has been verified by a verifier,
• and wherein each of the plurality of participant terminals stores unverified transaction information to which is added an unverified transaction object, which represents a transaction and is an object that has not yet been verified by a verifier, the method comprising:
• (A) receiving by the first participant terminal, from the second participant terminal, an unverified transaction object group as one or more unverified transaction objects included in the unverified transaction information in the second participant terminal,
• (B) when the first participant terminal is offline, adding by the first participant terminal an unverified transaction object representing an unverified transaction between a first participant as a participant of the first participant terminal and a second participant as a participant of the second participant terminal, to each of the unverified transaction information in the first participant terminal and the received unverified transaction object group, and sending the unverified object group to which the unverified transaction object has been added, to the second participant terminal,
• when the first participant terminal is online, if the unverified transaction information in the first participant terminal includes one or more unverified transaction objects, (N1) to (N3) below are performed:
• (N1) requesting by the first participant terminal one or more verifiers to verify at least one unverified transaction object among the one or more unverified transaction objects;
• (N2) requesting, by the first participant terminal, addition of one or more verified transaction objects as each of the transaction objects that were successfully verified to the verified transaction information;
• and
• (N3) deleting by the first participant terminal the one or more unverified transaction objects corresponding respectively to the one or more verified transaction objects from the unverified transaction information in the first participant terminal.

A non-transitory computer readable memory storing a computer-readable program which, when executed by a processor of a first participant terminal, causes the first participant terminal, which is any information processing terminal, to:

• perform (A) and (B) below,
• wherein at least one participant terminal among the plurality of participant terminals stores verified transaction information including a verified transaction object, which is a transaction object that has been verified by a verifier,
• and wherein each of the plurality of participant terminals stores unverified transaction information including an unverified transaction object, which is a transaction object that has not yet been verified by a verifier,
• (A) receive, from a second participant terminal, an unverified transaction object group including one or more unverified transaction objects included in unverified transaction information in the second participant terminal,
• (B) when the first participant terminal is offline, add an unverified transaction object representing an unverified transaction between a first participant as a participant of the first participant terminal and a second Participant as a participant of the second participant terminal to each of the unverified transaction information in the first participant terminal and the received unverified transaction object group, and
• send an unverified transaction object group to which the unverified transaction object has been added to the second participant terminal,
• when the first participant terminal is online, if the unverified transaction information in the first participant terminal includes one or more unverified transaction objects perform (N1) to (N3):
• (N1) request one or more verifiers to verify at least one unverified transaction object among the one or more unverified transaction objects;
• (N2) request addition of one or more verified transaction objects as each of the transaction objects that were successfully verified to the verified transaction information;
• and
• (N3) delete the one or more unverified transaction objects corresponding respectively to the one or more verified transaction objects from the unverified transaction information in the first participant terminal.