What is practical Byzantine fault tolerance?

Practical Byzantine Fault Tolerance is a consensus algorithm introduced in the late 90s by Barbara Liskov and Miguel Castro. pBFT was designed to work efficiently in asynchronous (no upper bound on when the response to the request will be received) systems. It is optimized for low overhead time.

Is a decentralized permissionless system a Byzantine fault tolerant system?

A decentralized, permissionless system is said to be Byzantine fault tolerant if it has solved the Byzantine Generals’ Problem — a problem that Bitcoin finally solved in a distributed manner. As it stands, anyone can join a decentralized, permissionless system and start broadcasting information.

How does bitcoin incorporate Byzantine fault tolerance into its network?

Bitcoin incorporates Byzantine fault tolerance into its network through the proof of work consensus protocol. The blockchain's PoW consensus algorithm mandates all the nodes on the blockchain to check the data structure, block size, block timestamp, block header hash, and the first transaction on every data.

What is BFT asynchronous fault tolerance?

Barbara Liskov and Miguel Castro introduced the BFT algorithm in the late 90s. It was tailored for working efficiently as asynchronous byzantine fault tolerance without any upper limit on the time of receiving a response to a concerned request. The practical BFT application has been developed for addressing notable issues in the existing BFT model.