{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T04:00:16Z","timestamp":1767844816635,"version":"3.49.0"},"reference-count":22,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,7,27]],"date-time":"2020-07-27T00:00:00Z","timestamp":1595808000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Future Internet"],"abstract":"<jats:p>A blockchain is a distributed ledger forming a distributed consensus on a history of transactions, and is the underlying technology for the Bitcoin cryptocurrency. Its applications are far beyond the financial sector. The transaction verification process for cryptocurrencies is much slower than traditional digital transaction systems. One approach to scalability or the speed at which transactions are processed is to design a solution that offers faster Proof of Work. In this paper, we propose a method for accelerating the process of Proof of Work based on parallel mining rather than solo mining. The goal is to ensure that no more than two or more miners put the same effort into solving a specific block. The proposed method includes a process for selection of a manager, distribution of work and a reward system. This method has been implemented in a test environment that contains all the characteristics needed to perform Proof of Work for Bitcoin and has been tested, using a variety of case scenarios, by varying the difficulty level and number of validators. Experimental evaluations were performed locally and in a cloud environment, and experimental results demonstrate the feasibility the proposed method.<\/jats:p>","DOI":"10.3390\/fi12080125","type":"journal-article","created":{"date-parts":[[2020,7,27]],"date-time":"2020-07-27T09:24:49Z","timestamp":1595841889000},"page":"125","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":52,"title":["Improving Transaction Speed and Scalability of Blockchain Systems via Parallel Proof of Work"],"prefix":"10.3390","volume":"12","author":[{"given":"Shihab","family":"Shahriar Hazari","sequence":"first","affiliation":[{"name":"Department of Electrical, Computer and Software Engineering, Ontario Tech University, Oshawa, ON L1G 0C5, Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0472-5757","authenticated-orcid":false,"given":"Qusay H.","family":"Mahmoud","sequence":"additional","affiliation":[{"name":"Department of Electrical, Computer and Software Engineering, Ontario Tech University, Oshawa, ON L1G 0C5, Canada"}]}],"member":"1968","published-online":{"date-parts":[[2020,7,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Yli-Huumo, J. (2016). Where is current research on blockchain technology?\u2014A systematic review. PLoS ONE, 11.","DOI":"10.1371\/journal.pone.0163477"},{"key":"ref_2","unstructured":"Scherer, M. (2017). Performance and Scalability of Blockchain Networks and Smart Contracts, Umea University. Available online: http:\/\/www.diva-portal.org\/smash\/get\/diva2:1111497\/FULLTEXT01.pdf."},{"key":"ref_3","unstructured":"Joseph, B., Andrew, M., Jeremy, C., Arvind, N., Joshua, A., Kroll, E., and Felten, W. (2015, January 17\u201321). Research perspectives and challenges for bitcoin and cryptocurrencies. Proceedings of the IEEE Symposium on Security and Privacy, San Jose, CA, USA."},{"key":"ref_4","unstructured":"(2018, November 03). Cryptocurrency Transaction Speeds: The Complete Review. The Daily Hodl. Available online: https:\/\/dailyhodl.com\/2018\/04\/27\/cryptocurrency-transaction-speeds-the-complete-review."},{"key":"ref_5","unstructured":"(2020, June 12). Understanding Cryptocurrency Transaction Speeds\u2014Coinmonks\u2014Medium. Medium. Available online: https:\/\/medium.com\/coinmonks\/understanding-cryptocurrency-transaction-speeds-f9731fd93cb3."},{"key":"ref_6","unstructured":"Nakamoto, Satoshi (2020, July 25). Bitcoin: A Peer-To-Peer Electronic Cash System. Available online: https:\/\/bitcoin.org\/bitcoin.pdf."},{"key":"ref_7","unstructured":"Johansen, S.K. (2017). A Comprehensive Literature Review on the Blockchain Technology as an Technological Enabler for Innovation, Mannheim University. [2nd ed.]."},{"key":"ref_8","unstructured":"(2020, June 05). Types of Cryptocurrency Hashing Algorithms\u2014Bitcoinlion.Com. Bitcoin Lion\u2014Your Gate to Cryptocurrency. Available online: http:\/\/www.bitcoinlion.com\/cryptocurrency-mining-hash-algorithms."},{"key":"ref_9","unstructured":"Crosby, M., Nachiappan, P., Pattanayak, S., and Verma, V. (2015). Kalyanaraman Blockchain Technology. Sutardja Center for Renessereneurship & Technology Technical Report, Sutardja Center for Entrepreneurship & Technology."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Hazari, S.S., and Qusay, H.M. (2019, January 7\u20139). A parallel proof of work to improve transaction speed and scalability in blockchain systems. Proceedings of the IEEE 9th Annual Computing and Communication Workshop and Conference (CCWC), Las Vegas, NV, USA.","DOI":"10.1109\/CCWC.2019.8666535"},{"key":"ref_11","unstructured":"Hazari, S.S. (2019). Design and Development of a Parallel Proof of Work for Permissionless Blockchain Systems. [Master\u2019s Thesis, Ontario Tech University]."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Cong, L.W. (2018). Decentralized Mining in Centralized Pools. SSRN Electron. J.","DOI":"10.2139\/ssrn.3143724"},{"key":"ref_13","first-page":"155","article-title":"Distributed Systems-Towards a Formal Approach","volume":"7","year":"1977","journal-title":"IFIP Congress."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"288","DOI":"10.1145\/42282.42283","article-title":"Consensus in the presence of partial synchrony","volume":"35","author":"Dwork","year":"1988","journal-title":"J. ACM"},{"key":"ref_15","unstructured":"Eyal, I., Gencer, A., Sirer, E., and Renesse, R. (2016, January 16\u201318). Bitcoin-NG: A Scalable Blockchain Protocol. Proceedings of the 13th USENIX Symposium on Networked Systems Design and Implementation (NSDI \u201916), Santa Clara, CA, USA."},{"key":"ref_16","first-page":"871","article-title":"Blockchain-Free Cryptocurrencies. A Rational Framework for Truly Decentralized Fast Transactions","volume":"2016","author":"Boyen","year":"2016","journal-title":"IACR Cryptol. ePrint Arch."},{"key":"ref_17","unstructured":"Popov, S. (2020, June 12). The Tangle. Available online: http:\/\/www.tangleblog.com\/wp-content\/uploads\/2016\/11\/IOTA_Whitepaper.pdf."},{"key":"ref_18","unstructured":"King, S., and Scott, N. (2020, July 25). Ppcoin: Peer-to-peer crypto-currency with proof-of-stake. Available online: https:\/\/www.peercoin.net\/whitepapers\/peercoin-paper.pdf."},{"key":"ref_19","unstructured":"(2018, October 20). How Do Mining Pools Work? Is It Better Than Solo Mining? Captainaltcoin. Available online: https:\/\/captainaltcoin.com\/what-is-pool-mining."},{"key":"ref_20","unstructured":"(2020, July 20). Implementation Code for Parallel Mining. Available online: https:\/\/github.com\/shihab2555\/Parallel_mining."},{"key":"ref_21","unstructured":"(2018, November 04). The Pioneer\u2019s Guide to GX\u2014Decentralized Dependency Management on IPFS. Hacker Noon. Available online: https:\/\/hackernoon.com\/the-pioneers-guide-to-gx-decentralized-dependency-management-on-ipfs-90064858f4c2."},{"key":"ref_22","unstructured":"Shaker, A., and Douglas, S.R. (September, January 31). Self-stabilizing structured ring topology p2p systems. Proceedings of the Fifth IEEE International Conference on the Peer-to-Peer Computing, Konstanz, Germany."}],"container-title":["Future Internet"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1999-5903\/12\/8\/125\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:51:59Z","timestamp":1760176319000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1999-5903\/12\/8\/125"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,7,27]]},"references-count":22,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2020,8]]}},"alternative-id":["fi12080125"],"URL":"https:\/\/doi.org\/10.3390\/fi12080125","relation":{},"ISSN":["1999-5903"],"issn-type":[{"value":"1999-5903","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,7,27]]}}}