Abstract
Blockchain, the foundation of Bitcoin, has received extensive attentions recently. Blockchain serves as an immutable ledger which allows transactions take place in a decentralized manner. Blockchain-based applications are springing up, cov- ering numerous fields including financial services, reputation system and Internet of Things (IoT), and so on. However, there are still many challenges of blockchain technology such as scalability and security problems waiting to be overcome. This paper presents a comprehensive overview on blockchain technology. We provide an overview of blockchain architechture firstly and compare some typical consensus algorithms used in different blockchains. Furthermore, technical challenges and recent advances are briefly listed. We also lay out possible future trends for blockchain.
Index Terms—Blockchain, decentralization, consensus, scala- bility
References
[1] “State of blockchain q1 2016: Blockchain funding overtakes bitcoin,” 2016. [Online]. Available: http://www.coindesk.com/ state-of-blockchain-q1-2016/
[2] S. Nakamoto, “Bitcoin: A peer-to-peer electronic cash system,” 2008. [Online]. Available: https://bitcoin.org/bitcoin.pdf
[3] G. W. Peters, E. Panayi, and A. Chapelle, “Trends in crypto-currencies and blockchain technologies: A monetary theory and regulation perspective,” 2015. [Online]. Available: http://dx.doi.org/10.2139/ssrn. 2646618 [4] G. Foroglou and A.-L. Tsilidou, “Further applications of the blockchain,” 2015.
[5] A. Kosba, A. Miller, E. Shi, Z. Wen, and C. Papamanthou, “Hawk: The blockchain model of cryptography and privacy-preserving smart contracts,” in Proceedings of IEEE Symposium on Security and Privacy (SP), San Jose, CA, USA, 2016, pp. 839–858.
[6] B. W. Akins, J. L. Chapman, and J. M. Gordon, “A whole new world: Income tax considerations of the bitcoin economy,” 2013. [Online].
Available: https://ssrn.com/abstract=2394738
[7] Y. Zhang and J. Wen, “An iot electric business model based on the protocol of bitcoin,” in Proceedings of 18th International Conference on Intelligence in Next Generation Networks (ICIN), Paris, France, 2015, pp. 184–191.
[8] M. Sharples and J. Domingue, “The blockchain and kudos: A distributed system for educational record, reputation and reward,” in Proceedings of 11th European Conference on Technology Enhanced Learning (EC-TEL 2015), Lyon, France, 2015, pp. 490–496.
[9] C. Noyes, “Bitav: Fast anti-malware by distributed blockchain consensus and feedforward scanning,” arXiv preprint arXiv:1601.01405, 2016.
[10] I. Eyal and E. G. Sirer, “Majority is not enough: Bitcoin mining is vulnerable,” in Proceedings of International Conference on Financial Cryptography and Data Security, Berlin, Heidelberg, 2014, pp. 436– 454.
[11] A. Biryukov, D. Khovratovich, and I. Pustogarov, “Deanonymisation of clients in bitcoin p2p network,” in Proceedings of the 2014 ACM SIGSAC Conference on Computer and Communications Security, New York, NY, USA, 2014, pp. 15–29.
[12] F. Tschorsch and B. Scheuermann, “Bitcoin and beyond: A technical survey on decentralized digital currencies,” IEEE Communications Sur- veys Tutorials, vol. 18, no. 3, pp. 2084–2123, 2016.
[13] NRI, “Survey on blockchain technologies and related services,” Tech. Rep., 2015. [Online]. Available: http://www.meti.go.jp/english/press/ 2016/pdf/0531 01f.pdf
[14] D. Lee Kuo Chuen, Ed., Handbook of Digital Currency, 1st ed. Elsevier, 2015. [Online]. Available: http://EconPapers.repec.org/RePEc: eee:monogr:9780128021170
[15] V. Buterin, “A next-generation smart contract and decentralized appli- cation platform,” white paper, 2014.
[16] D. Johnson, A. Menezes, and S. Vanstone, “The elliptic curve digital signature algorithm (ecdsa),” International Journal of Information Se- curity, vol. 1, no. 1, pp. 36–63, 2001.
[17] V. Buterin, “On public and private blockchains,” 2015. [Online]. Available: https://blog.ethereum.org/2015/08/07/ on-public-and-private-blockchains/
[18] “Hyperledger project,” 2015. [Online]. Available: https://www. hyperledger.org/
[19] “Consortium chain development.” [Online]. Available: https://github. com/ethereum/wiki/wiki/Consortium-Chain-Development
[20] L. Lamport, R. Shostak, and M. Pease, “The byzantine generals prob- lem,” ACM Transactions on Programming Languages and Systems (TOPLAS), vol. 4, no. 3, pp. 382–401, 1982.
[21] S. King and S. Nadal, “Ppcoin: Peer-to-peer crypto-currency with proof- of-stake,” Self-Published Paper, August, vol. 19, 2012.
[22] “Bitshares - your share in the decentralized exchange.” [Online].
Available: https://bitshares.org/
[23] D. Schwartz, N. Youngs, and A. Britto, “The ripple protocol consensus algorithm,” Ripple Labs Inc White Paper, vol. 5, 2014.