1. andes: Bitcoin’s kryptonite: the 51% attack, June 2011.
https://bitcointalk.org/index.php?topic=12435
2. Andresen, G.: March 2013 chain fork post-mortem. BIP 50.
https://en.bitcoin.it/wiki/BIP_50
. Accessed September 2013
3. Araoz, M.: Proof of existence.
http://www.proofofexistence.com/
. Accessed September 2013
4. Babaioff, M., Dobzinski, S., Oren, S., Zohar, A.: On Bitcoin and red balloons. In: ACM Conference on Electronic Commerce, pp. 56–73 (2012)
5. Lecture Notes in Computer Science;S Barber,2012