IPA IP 2025 Question 25
A question IPA Japan published in 令和7年度 ITパスポート試験 公開問題 問25, translated into English. ITPEC is based on the same exams.
Which of the following is the most appropriate example of applying blockchain?
Explanation
Digital corporate bonds issued to prevent falsified transactions and inconsistencies — keeping a tamper-proof shared record of transactions is what a blockchain does.
A blockchain is a distributed ledger. Transaction records are grouped into blocks, each block holds the hash value of the block before it, and many participants keep copies of the whole chain. Altering a past record changes its hash and breaks every link after it, and the other copies no longer agree, so falsification is detected and is practically impossible. Since every participant holds the same ledger, the records cannot drift into inconsistency either. Securities companies use this to issue digital bonds whose ownership and trades are recorded on the chain.
Answer (a)
Why not others:
- •(b) — cutting the order response time to under 1 second is a performance improvement; a blockchain's agreement between participants makes processing slower, not faster
- •(c) — letting customers change reservations until 1 hour before departure is a change to the service rules and needs no tamper-proof ledger
- •(d) — keeping images and audio in a searchable database is a knowledge archive; a blockchain is ill-suited to storing large media files
Key rule: Use blockchain where many parties must trust one record that must not be altered (cryptocurrency, securities, supply-chain tracing), not for speed or for storing large data.
Business Industry · AI-written, may contain errors
This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.