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Polkadot blog

Consensus

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Polkadot Consensus Part 4: Security
Consensus
Polkadot Consensus Part 4: Security

So far, we have discussed how BABE creates blockchain candidates and GRANDPA finalizes them. We know that we need more than two-thirds of validators to properly follow the protocol. But how many validators are there? How are they chosen? Why should they follow the rules?...

Polkadot Consensus Part 3: BABE
Consensus
Polkadot Consensus Part 3: BABE

Blind Assignment for Blockchain Extension (BABE) is a block production engine that was inspired by Ouroboros Praos, another proof-of-stake protocol. It can be used on its own because it provides probabilistic finality, or it can be coupled with a finality gadget like GRANDPA....

Polkadot Consensus Part 2: GRANDPA
Consensus
Polkadot Consensus Part 2: GRANDPA

In the introduction to this series, I outlined that a consensus algorithm helps a network of computers answer three questions. GRANDPA addresses the second....

Polkadot Consensus Part 1: Introduction
Consensus
Polkadot Consensus Part 1: Introduction

This series will be a discussion about security and consensus in Polkadot. In part 1, we will define some terms before getting into the details of how Polkadot creates and secures blocks....

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