Blockchain is a good technology that will be use as a tool of transparency to every transaction being done. The government should know and develop a system like this on their system. This will eradicate corruption or transactions being made under the table because there will be a transparency on every transactions and how much money is involve. The budget of the people will be obviously utilize to its intended purpose. Would you agree with this idea?
You mentioned blockchain as a backup for transparent payments, but it could also be used for things like storage of data, which could not be intentionally changed.
One of the examples is implementing blockhain-based system of elections. Imagine there is an open system that prevents cheating with your vote - I think this could be especially demanded in the countries with high level of corruption.