Before comparing mechanisms, list who may submit requests and who controls the systems that agree on them. Those are different roles. Harbour permits named organizations to submit dispatch requests. Its members also want shared control: no member should be able to impose the accepted history alone.
A conventional shared database is a legitimate comparison. If everyone accepts one registrar and its correction process, that arrangement may meet the real need.
Consensus is not automatically a business improvement. In this course, treat control preferences as supplied requirements rather than universal recommendations.
Write the requirement without naming a product first. Then a proposal can fail a requirement for a clear reason, instead of receiving a vague low score for being insufficiently modern.
Test your interpretation
The warehouse offers to host the only authoritative database. The other three members have not accepted it as sole registrar.
Record the missing agreement before recommending the hosted database. Record your response in worksheet section problem.
Model response and reasoning
Harbour has not agreed to give the warehouse unilateral authority over the dispatch history.
The hosted option depends on a trust decision that the case explicitly leaves unresolved. More backups would not obtain that agreement.
Check: Identify authority rather than counting database copies.
Source
Blockchain Technology Overview. The exercise inputs and model choices are fictional teaching examples.