Practical Byzantine Fault Tolerance is a consensus algorithm introduced by Barbara Liskov and Miguel Castro in the late 1990s. So what does Byzantine Fault Tolerance mean and where is BFT used. If you want to know that, let’s take a look at the article below.
What does Byzantine Fault Tolerance mean?
Byzantine fault tolerance is the ability of a computer system to continue operating even if some nodes fail or act maliciously. The term comes from a hypothesis called the Byzantine Generals' Problem. As you might expect, this logic dilemma is about a group of Byzantine generals. Each general has an army and a position around a fort, and they must as a whole decide to attack or retreat.
If they all make the same decision, then they have succeeded. However, if miscommunication or betrayal causes some generals to attack while others retreat, the battle is lost. These types of problems are known as Byzantine faults.
For any computer system with multiple nodes, each node can be thought of as a generic node. Byzantine fault tolerance of a system refers to whether it can continue to work even if some nodes go down or deliberately try to trick it.
How does Byzantine Fault Tolerance relate to blockchain?
Blockchain technology is the way cryptocurrencies verify, process and record transactions. In order for a transaction to go through, a group of nodes must agree that it is valid. Every blockchain network has a consensus algorithm, which are the specific rules its nodes follow to reach agreement on transactions.
The consensus algorithm is how the blockchain achieves Byzantine fault tolerance. Because cryptocurrencies are decentralized, every cryptocurrency faces a massive version of the Byzantine Generals Problem. A blockchain needs to be able to function properly, even if its nodes are malfunctioning or providing false information.
Bitcoin (CRYPTO: BTC ) first aims to solve this problem through proof-of-work. In this consensus algorithm, miners must use specialized computer equipment to solve complex equations. The first miner to solve the equation correctly will earn the right to add a block of transactions and be rewarded. If you're not generating the right data, all your time and effort will be wasted.
Where is BFT used?
The most commonly used consensus protocols in blockchain networks, such as proof-of-work, proof-of-stake, and proof-of-authority, share some properties of BFT. By applying Byzantine Fault Tolerance, it is possible to design systems that are not controlled by a single authority and do not depend on trusting certain parties. It is the basis for building a decentralized network.
I hope this article will help you to learn what does Byzantine Fault Tolerance mean and where is BFT used. It is clear that Byzantine Fault Tolerance plays an important role in transforming consensus methods. Blockchain applications are slowly gaining momentum in different fields. However, many problems arise in modern blockchain networks.
