# Binance Smart Chain: Luban Hard Fork

By [Arhat](https://paragraph.com/@arhat-2) · 2023-06-01

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Binance Smart Chain Mainnet will undergo the Luban hard fork in a few weeks on June 11th.

The Luban hard fork will incorporate three BEPs:

*   **BEP-126**: Introduce Fast Finality Mechanism.
    
*   **BEP-174**: Introduce BSC Extension Protocol.
    
*   **BEP-221**: Introduce BSC Fee Market.
    

BEP-126
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BEP-126 introduces a Fast Finality Mechanism to the Binance Smart Chain (BSC) network. It aims to reduce the confirmation time and improve the user experience of BSC transactions by introducing a voting mechanism among validators.

According to the proposal, the Fast Finality Mechanism works as follows:

*   The validators form a committee that votes on each block using a BLS-based multi-signature scheme.
    
*   The committee size is dynamically adjusted according to the number of active validators and the network latency.
    
*   The committee members broadcast their votes to each other through a peer-to-peer (P2P) channel.
    
*   The votes are aggregated into a signature that attests the validity of the block.
    
*   The signature is attached to the block header and propagated to the network.
    
*   The block is considered fast finalized if it has a valid signature from more than two-thirds of the committee members.
    
*   The fast finalized blocks can be used as cross-chain communication and data-sharing checkpoints.
    

BEP-174
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BEP-174 introduces a new governance proposal type to manage the set of whitelisted Relayers. A Relayer is a service that facilitates cross-chain communication and data sharing among different blockchains by relaying messages and transactions between them.

According to the proposal, the new governance proposal type works as follows:

*   The validators can submit a proposal to add or remove a Relayer from the whitelist.
    
*   The proposal must include the Relayer’s address, name, and description.
    
*   The proposal must also specify the amount of BNB that will be locked as collateral by the Relayer.
    
*   The validators will vote on the proposal within a certain period of time.
    
*   If the proposal passes, the Relayer will be added or removed from the whitelist accordingly.
    
*   If the Relayer is added to the whitelist, it must lock the specified amount of BNB as collateral before it can start relaying messages and transactions.
    
*   If the Relayer is removed from the whitelist, it will lose its collateral, and the network will reject its relayed messages and transactions.
    

BEP-221
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BEP-221 introduces a new pre-compiled contract to authorize the CometBFT blocks. CometBFT is a light block validation protocol that the BSC Extension Protocol uses to verify the block headers of other blockchains.

According to the proposal, the new pre-compiled contract works as follows:

*   The contract takes the block header and the signature of a CometBFT block as inputs.
    
*   The contract verifies the validity of the signature using the public keys of the validators who signed the block.
    
*   The contract checks if the signature has enough quorum (more than two-thirds of the validators) to authorize the block.
    
*   The contract returns true if the signature is valid and has enough quorum and false otherwise
    

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The hard fork is expected to bring more innovation and efficiency to the BSC ecosystem and make it more competitive.

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*Originally published on [Arhat](https://paragraph.com/@arhat-2/binance-smart-chain-luban-hard-fork)*