The blockchain technology is one of the greatest inventsions ever made. Some people said that this invention will revolutionize the business sectors and help improve its accuracy when it comes to data management and also prevents from fraud due to the visibility of information to the public.
I wouldn't call it one of the greatest though, as somewhat have said, its just a ledger, and database has been with us since the early years of PC. Although it has great advantage like data is "immutable", hard to tampered with, etc..
This might not be deemed as a very important invention nowadays but as we are moving forward to the digital future, we slowly consider the mere fact that this invention is one of the greatest innovation next to internet.
In terms of changing the lives of people, this invention doesn't bring that much impact as Internet does. On the contrary, it only adds value for major companies to fully reduced its dependencies so much on people, i.e CEO just can pull the data anytime he/she wanted without calling the secretary on the other room. Provides efficiency and it can help make business decisions very quickly because all the data is transparent.