Almost 
a year after first releasing MultiChain, we’ve learnt a huge amount about how Blockchains, in a private and non-cryptocurrency sense, can and cannot be applied to real-world problems.
Blockchains are ideal for shared databases in which every user is able toread everything, but no single user controls who can write what. By contrast, in traditional databases, a single entity exerts control over all read and write operations, while other users are entirely subject to that entity’s whims. To sum it up in one sentence: Blockchains represent a trade-off in which disintermediation is gained at the cost of confidentiality.
Source: Gideon Greenspan – Four Genuine Blockchain Use Cases – Blockchain News