Distributed immutable logs of data existed long before the Blockchain (as someone pointed out, Git is a good example - just sign your commits). The innovation o

Distributed immutable logs of data existed long before the Blockchain (as someone pointed out, Git is a good example - just sign your commits). The innovation of the Blockchain was specifically the combination of that with the POW, which enabled coordination between untrusted nodes without falling prey to Sybil attacks. A private blockchain is just giving another name to a preexisting model. It's like saying "I use a pedelec, but I see more advantages in removing the motor and battery".