Delegated Byzantine Fault Tolerance

What Does Delegated Byzantine Fault Tolerance Mean?

Delegated Byzantine Fault Tolerance (dBFT) is a sophisticated algorithm meant to facilitate consensus on a blockchain. Although it is not in common use as of yet, it represents an alternative to simpler proof of stake, proof of importance and proof of work methods.


Techopedia Explains Delegated Byzantine Fault Tolerance

The story of this as-of-yet theoretical algorithm is fascinating – it is meant to address a particular old-school game theory problem called the Byzantine generals’ problem. In this scenario, there are a number of generals formulating a plan to attack a city. Consensus needs to be met, since anything less than a consensus leads to significant battle failures. However, there are communication difficulties, and there is an additional concern – in the Byzantine generals’ problem, planners have to look out for individual treacherous actors – actors who may not even report the same decision to all involved parties.

In the blockchain world, this is explained by pointing out that while some node operators are professionals, others are amateurs with a less sophisticated view of markets and game theory and everything else. They cannot be counted on, so this is the complex issue that Delegated Byzantine Fault Tolerance addresses. In order to handle this uncertainty, Delegated Byzantine Fault Tolerance uses a two-thirds rule and other elements to make sure that consensus is achieved even with a lot of unknowns.


Related Terms

Margaret Rouse

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.