1. Andrychowicz, M., Dziembowski, S.: Distributed cryptography based on the proofs of work. Cryptology ePrint Archive, report 2014/796 (2014)
2. Aspnes, J., Jackson, C., Krishnamurthy, A.: Exposing computationally-challenged byzantine impostors. Department of CS, Yale University, Technical report (2005)
3. Babai, L.: Trading group theory for randomness. In: STOC (1985)
4. Back, A.: Hashcash - a denial of service counter-measure, Technical report (2002)
5. Bahack, V.: Theoretical bitcoin attacks with less than half of the computational power (draft). arXiv preprint
arXiv:1312.7013
(2013)