Proposer-Builder Separation (PBS)

Proposer-Builder Separation (PBS) is a concept that was introduced in the context of the Binance Smart Chain (BSC) to address scalability and improve decentralization. PBS separates the block proposal and block building functions, allowing different participants to perform these tasks independently.

In a blockchain network, the block proposal function involves selecting a set of pending transactions and creating a new block. The block building function, on the other hand, involves validating and appending the proposed block to the blockchain.

With PBS, the block proposal function is performed by special nodes known as proposers. These nodes are responsible for creating blocks by selecting transactions and proposing them for inclusion in the blockchain. They compete with each other to become the chosen proposer for a particular block.

The block building function is carried out by validator nodes, which are responsible for validating the proposed blocks and appending them to the blockchain. Validators verify the transactions, check for any invalid or malicious activities, and ensure that the proposed block meets the consensus rules of the network.

By separating the block proposal and block building functions, PBS aims to achieve greater scalability and decentralization. The separation allows for more efficient processing of transactions and reduces the burden on individual nodes.

Furthermore, PBS introduces a random selection process for both proposers and validators, ensuring that different participants have the opportunity to contribute to the network. This randomness enhances the security and fairness of the blockchain.

The introduction of PBS in the Binance Smart Chain is part of an ongoing effort to improve the performance and sustainability of the network. It enables a more scalable and decentralized blockchain ecosystem, which can handle a larger number of transactions and support a wider range of applications.

Overall, Proposer-Builder Separation is a mechanism that enhances the efficiency and decentralization of blockchain networks by separating the block proposal and block building functions, allowing different participants to contribute to the consensus process.

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