Chaudhary, Kaylash C. and Chand, Vishal and Fehnker, Ansgar (2020) Double - spending analysis of Bitcoin. [Conference Proceedings]
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Abstract
Bitcoin is a distributed online payment system that facilitates anonymous transactions using a peer-to-peer network without a central trusted authority. Every peer in the Bitcoin network keeps the collection of all transactions which is referred to as a ledger. This public ledger will work effectively for honest peers, however, one well-known attack is the fifty-one percent or majority attack. This paper provides an Uppaal model of the Bitcoin protocol focusing on its three important components namely transactions, blocks and the blockchain. It presents a probability analysis for two scenarios of the fifty-one percent attacks. Two Phase Proof-of-Work (2PPoW) is a proposed solution to address attacks of this type, and we will extend the model to include 2PPoWand calculate the probability of a successful attack. The analysis shows that a traditional fifty-one percent attacks can be successful even if the attacker has less than a majority of the processing pool.
| Item Type: | Conference Proceedings |
|---|---|
| Subjects: | Q Science > Q Science (General) > Q350-390 Information theory |
| Divisions: | Faculty of Science, Technology and Environment (FSTE) > School of Computing, Information and Mathematical Sciences |
| Depositing User: | Kaylash Chaudhary |
| Date Deposited: | 13 Aug 2020 23:16 |
| Last Modified: | 25 Apr 2022 22:15 |
| URI: | https://repository.usp.ac.fj/id/eprint/12250 |
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