Blockchain is the next big thing in Fintech, with known examples like Bitcoin and Ethereum. And while it is great for highly distributed settings with many contributors that do not necessarily trust each other, it also comes with several security and privacy concerns.
Opacity improves over pure block-chain: trust is generated by one or a few contributors instead of relying on a vast amount of computational power generated by many. This makes Opacity ideal for use cases like payments with bank guarantees, document chains, smart contracts. Opacity is rock solid security wise and also brings privacy to the table, allowing one to host the data anywhere in the cloud.