There is no specific condition on using it. However, the network must be a peer-to-peer network under the concerned protocols. It actually validates the new block simply and helps organizations to keep up the pace in this matter without investing in third-party applications.
I don’t really understand the points, but it’s true, blockchain is not used publicly, so there is no specific organization that leads it
Blockchain technology can be applied in various business organizations and government institutions. The problem is, there are still many business organizations not aware of the technology or consultants needed to implement it. there are no specific requirements for implementing this technology.