VERIFICATION METHOD, INFORMATION PROCESSING DEVICE, AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUM FOR STORING VERIFICATION PROGRAM

摘要

A verification method implemented by a first system including a plurality of computers, the method includes: calculating a first hash value for an original document; calculating a second hash value for an original document by using the first hash value; calculating a first modified version's first hash value for the first modified version document; calculating a first modified version's second hash value that is a hash value obtained by combining the first modified version's first hash value and the original document's second hash value; in response to a second modified version document obtained by modifying the first modified version document, calculating a second modified version's first hash value for the second modified version document; and calculating a second modified version's second hash value that is a hash value obtained by combining the second modified version's first hash value and the first modified version's second hash value.