Ardor is a blockchain-as-a-service platform that enables developers to leverage the technology of the Nxt platform to create enterprise blockchain applications. The project attempts to solve the scalability challenges associated with blockchain systems with “Child Chains,” which are conceptually like sidechains, where an application-specific blockchain runs in parallel to the main chain. The key difference is that Ardor’s Child Chains are more tightly integrated with the parent chain as all sidechain transactions are validated by nodes in Ardor’s network. These sidechains share a near-identical structure with Ardor’s main chain, and can be created and deployed using a common toolset. This architecture attempts to facilitate a concept commonly referred to as blockchain pruning, where stakeholders only download information pertinent to them. Pruning enables the stakeholders of an enterprise child chain, for example, to only store data that is relevant to their company, rather than downloading the entire blockchain. Like Nxt, Ardor uses a delegated Proof of Stake consensus algorithm to assign transaction validation power. The project is funded by Jelurida, the same company that created the NXT platform. The first Child Chain of Ardor, called "Ignis," was funded by a token sale conducted by Jelurida during the second half of 2017. The Ardor platform officially launched on January 1, 2018.