@misc{cryptoeprint:2017:1067,
    author = {Frederik Armknecht and Jens-Matthias Bohli and  Ghassan O. Karame and Wenting Li},
    title = {Sharding PoW-based Blockchains via Proofs of Knowledge},
    howpublished = {Cryptology ePrint Archive, Report 2017/1067},
    year = {2017},
    url = {https://eprint.iacr.org/2017/1067},
}