Hedera Blog

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Hedera Technical Insights: Code is law, but what if the law needs to change?

Dec 05, 2018Paul Madsen

Distributed Ledger Technologies (DLTs) commonly have simple and inflexible forms of immutability. Hedera supports a more flexible form of controlled mutability, which allows certain changes under certain circumstances, but prevents other types of changes. One area where this is particularly important is for smart contracts.

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These Hedera SDKs are so freakin’ cool

Nov 13, 2018Ken Anderson

We’re still so early in this journey we call Hedera Hashgraph. We just started opening up testnets to a wider audience of developers and boy did we learn some really cool things…things that have informed how we want to build our SDKs. Frankly, we need to make sure that developers absolutely love the SDK experience. So we’re getting smart and fun about building our SDKs with the help of those very same developers.

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Hedera Technical Insights: Fragility in DLT

Nov 08, 2018Paul Madsen

Some consensus algorithms are fragile — they cannot adapt to changes, either in the membership of nodes, or in the influence of those nodes towards consensus. The result is that such changes cause consensus to be prevented or corrupted. This can be a problem for some types of distributed ledgers, but it is not a problem for Hedera.

Formal Methods And Abft Blog

Formal Methods: The Importance of Being ABFT in a World with Bad Actors

Oct 29, 2018Hedera Team

The highest security standard for consensus algorithms is known as Asynchronous Byzantine Fault Tolerance (ABFT). The hashgraph algorithm, as used in the Hedera public ledger, achieves this gold standard, with a mathematical proof that it is ABFT. This proof-of-stake consensus system was first proved to be ABFT in a rigorous math proof published in 2016. That proof has now been verified by computer in a formal verification completed by a Carnegie Mellon University professor — and we think it is important to explain what that means.

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Hedera Hashgraph Announces Winners Of Global Hackathon And Hedera MVPs

Oct 18, 2018Hedera Team

Dallas TX – Oct 18, 2018 – Hedera Hashgraph, a next-generation distributed public ledger with highly diversified governance, today announced the winners of the Hedera18 global hackathon, plus seven regional winners and the inaugural Hedera MVPs. Hedera today also announced the launch of, a free educational resource to the hashgraph community.

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Coq Proof Completed By Carnegie Mellon Professor Confirms Hashgraph Consensus Algorithm Is Asynchronous Byzantine Fault Tolerant

Oct 17, 2018Hedera Team

Dallas TX, Hedera18 Developer Conference – October 17, 2018 – Hedera Hashgraph, a next-generation distributed public ledger with highly diversified governance, today announced that the hashgraph consensus algorithm has been validated as asynchronous Byzantine Fault Tolerant (ABFT) by a math proof checked by computer using the Coq system.

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Hedera Hashgraph Releases Open Source SDK & Announces Final Speaker Lineup For Hedera18 Developer Conference

Oct 10, 2018Hedera Team

Dallas TX – Oct 10, 2018 – Hedera Hashgraph, a next-generation distributed public ledger with highly diversified governance, today announced the public release of the Hedera SDK in Java. The SDK is open sourced under an Apache 2 license, and can be found at With the SDK, developers can now begin to develop Hedera-based applications for use on the Hedera platform. 

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The evolution of possibilities

Oct 05, 2018Hedera Team

From the origin of Bitcoin as a digital gold, to Vitalik establishing a new development paradigm, distributed ledger technology has begun to enable a fully decentralized world. Understand the growth of distributed ledgers and how the technology has changed to make new dapps possible in the Evolution of Distributed Ledger Technologies infographic.

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Hedera18: Event livestream, pricing updates, & new hackathon cities announced

Sep 10, 2018Hedera Team

This week, Mance Harmon, Co-Founder and CEO, provided a quick update on Hedera18, our first hashgraph developer conference, including a free global livestream of the conference, new conference pricing, and 4 additional hackathon locations. The video and full transcript of the update are inside.