What Is a Block Chain?

There are private block chans and public block shanes, which can be joined by any one at any time. While it is a immutable and information on there can't be changed, it does not determine if information is true or false. You still have to be certain that the cotton that enters the supply chain is organic. It just needs a ne ofsens you need a centralized system, not a distributed system like block chane would i think so for now, maybe in the future.