|Original author(s)||Leemon Baird|
|Initial release||July 2017|
Hashgraph is a distributed ledger technology developed by Leemon Baird, the co-founder and CTO of Swirlds, in 2016. It is an asynchronous Byzantine Fault Tolerance (aBFT) consensus algorithm that they consider capable of securing the platform against attacks. It does not use miners to validate transactions, and uses directed acyclic graphs for time-sequencing transactions without bundling them into blocks.
Several experts describe Hashgraph as a continuation of where the idea of blockchain begins while some consider it as an alternative to it, a technology known as first generation and typified by severe speed, fairness, cost, and security constraints. Some academics maintain it is less technically constrained than blockchains proper. The Hedera white paper co-authored by Baird explained that "at the end of each round, each node calculates the shared state after processing all transactions that were received in that round and before," and it "digitally signs a hash of that shared state, puts it in a transaction, and gossips it out to the community." Hedera Hashgraph is a public distributed ledger based on the Hashgraph algorithm which in 2018 raised $100 million at a $6 billion market cap.
Cornell Professor Emin Gün Sirer notes that “The correctness of the entire Hashgraph protocol seems to hinge on every participant knowing and agreeing upon N, the total number of participants in the system,” which is "a difficult number to determine in an open distributed system.” Baird responded that “All of the nodes at a given time know how many nodes there are.”
- "Can hashgraph succeed blockchain as the technology of choice for cryptocurrencies?", The Hindu, 25 March 2018
- "Hashgraph wants to give you the benefits of blockchain without the limitations", TechCrunch, 14 March 2018
- Treiblmaier, Horst; Beck, Roman (2018). Business Transformation through Blockchain, Volume 2. Cham: Palgrave Macmillan. p. 98. ISBN 9783319990576.
- Tapscott, Don; Tapscott, Alex (2016). Blockchain Revolution: How the Technology Behind Bitcoin Is Changing Money, Business, and the World. Penguin. ISBN 9781101980156.
- Panetto, Herve; Debruyne, Christophe; Proper, Henderik; Ardagna, Claudio; Roman, Dumitro; Meersman, Robert (2018). On the Move to Meaningful Internet Systems. OTM 2018 Conferences: Confederated International Conferences: CoopIS, C&TC, and ODBASE 2018, Valletta, Malta, October 22-26, 2018, Proceedings, Part 2. Cham: Springer. p. 281. ISBN 9783030026707.
- "Can hashgraph unseat blockchain as the favoured tech for cryptocurrencies?", Live Mint, 20 March 2018
- "Next-Generation Crypto-Ledgers Take the Block Out of Blockchain". Bloomberg. Retrieved 24 February 2018.
- Baird, Leemon; Harmon, Harmon; Madsen, Paul (13 August 2019). "Hedera: A Governing Council & Public Hashgraph Network" (PDF). Hedera. Retrieved 21 January 2019.
- "How Hedera Hashgraph is building a fast and secure blockchain alternative", VentureBeat, 4 August 2018
- "Hedera Hashgraph Thinks It Can One-Up Bitcoin And Ethereum With Faster Transactions", Forbes, 13 March 2018
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