Exonum is a blockchain framework designed to handle smart contracts with efficiency, security, and high performance in mind. With it, you can take advantage of a private blockchain to write your smart contracts in Rust and Java and handle them at impressive speeds. Besides, you can use Exonum to develop a token or cryptocurrency if your project calls for one. 

Exonum is an extensible open-source framework for creating blockchain applications. Exonum can be used to create cryptographically powered distributed ledgers in virtually any problem domain, including FinTech, GovTech, and LegalTech. The Exonum framework is oriented towards creating permissioned blockchains, that is, blockchains with the known set of blockchain infrastructure providers.