Very interesting.

KSI is a centralized system that encrypts data inside of its servers using customer-held private keys. I guess you could call that "blockchain" but it's not the blockchain concept most people are aware of today.

For me, KSI actually underscores how much the post-Satoshi approach to blockchain (decentralized) does not work. I already know this based on my experience with high-scale architecture, but this is yet another piece of empirical evidence.