Actually it might primarily be for foreign governments.
100% online transparency would show things like, look, US citizen, Binod Chaudhary built 10,000 homes and 100 schools with a 25 crore donation, but your government has spent 2500 crores and built only 5,000 homes ---- where did the money go?
Each declared donation would be directly linked to all the resultant specific projects on the ground.
The biggest donors are all democracies. They answer to their people. And their people will not know to ask the right questions unless they have the information. You build the pressure through 100% online transparency.
The NGOs doing the best work would surface up. And that would create an environment for them to raise more money to do more good work.