Openchain is a series of sidechains that communicate to one another, with only one authority that validates transactions within each sidechain. BigchainDB is a

Openchain is a series of sidechains that communicate to one another, with only one authority that validates transactions within each sidechain. BigchainDB is a single instance that leverages distributed databases but builds on top decentralized control so that for every transaction, a least a majority of nodes must validate and approve. Each block is validated and then chained together, giving the characteristic of immutability.