Private database = centralized database. Gawsh.
#Bitcoin has a grand unified ledger because I don't like my savings to just disappear due to no node holding my info. Who would believe me that I own 10 million coins, written on my own ledger if no other ledger has info about it.
Are you for real??
To call the ledger centralized, PROVIDE information about the central authority that can change the details anytime they wish. Again, YOU WON'T.