Reclaim protocol, which allows for computationally efficient, secure and private generation of proofs of provenance (PoP) completely on client side that users can then share to any third-party. Furthermore, users can generate zero-knowledge proofs of features of their data to avoid sharing sensitive information. Reclaim also describe a decentralized extension of the protocol that eliminates the need to use any trusted parties, by implementing an economic mechanism to incentivize honest behavior.