Bitcoin has been around a while and the blockchain foundations on which it is built are extending organically into other areas.
Blockchain is a strongly encrypted distributed database, a ledger that records every transaction. That’s all fine, it works OK, and it doesn’t need fixed.
However, for some applications or new cryptocurrencies, there may be some benefit in making a cellular blockchain to limit database size, protect against network outage, and harden defenses against any local decryption. These may become important as cyber-terrorism increases and as quantum computing develops. They would also be more suited to micro-transactions and micro-currencies.
If you’ve made it this far, you almost certainly don’t need any further explanation.