Corporate blockchains are different from public blockchains such as Bitcoin, Ethereum, and the other projects discussed so far, mainly in one key aspect: access to the network. While in public blockchains, anyone can download some open source software, join the network, and use it, in private blockchains, access to the network is restricted. Corporations, government entities, or other organizations can build their own private blockchains to serve their business or administrative purposes. Such private blockchains are typically more centralized and much closer to a distributed database or ledger in their architecture and functions. This is because they don't need a decentralized trust model like Bitcoin and other public blockchains.
If all blockchain participants are known, and have been pre-approved and vetted, there isn't much need...