@misc{cryptoeprint:2013:730,
    author = {{\L}ukasz Krzywiecki  and  Przemys{\l}aw Kubiak and Miros{\l}aw Kuty{\l}owski},
    title = {Stamp \& Extend -- Instant but Undeniable Timestamping based on Lazy Trees},
    howpublished = {Cryptology ePrint Archive, Report 2013/730},
    year = {2013},
    url = {https://eprint.iacr.org/2013/730},
}