@misc{cryptoeprint:2017:775,
    author = {Juan A. Garay and Aggelos Kiayias and Giorgos Panagiotakos},
    title = {Proofs of Work for Blockchain Protocols},
    howpublished = {Cryptology ePrint Archive, Report 2017/775},
    year = {2017},
    url = {https://eprint.iacr.org/2017/775},
}