Binance's BNB Chain launches optimism-powered layer-2 testnet.


Binance-founded layer-1 blockchain BNB Chain expects their layer-2 chain will solve its “scalability challenge.”

BNB Chain released opBNB, a testnet, on June 19. Binance claims the new layer-2 scaling solution, based on the Optimism OP Stack, would increase security and scalability.

The Ethereum Virtual Machine (EVM)-compatible layer-2 chain supports Ethereum-based smart contracts, networks, and ERC-20 tokens.

Blockchains experience network congestion and hefty fees during peak usage. BNB Chain reports 2,000 transactions per second for $0.10.


The statement states that opBNB can process over 4,000 transfer transactions per second at less than $0.005.

It also mentioned that opBNB optimizes data accessibility, the caching layer, and the submission process algorithm for simultaneous operations. This raises the gas restriction to 100 million per block from 30 million in Optimism.

Binance said opBNB is their “answer to the scalability challenge that has limited the mass adoption of blockchain technology.”

Optimism scales transactions by automatically assuming transaction data processed off the root chain is legitimate unless proved otherwise via Optimistic Rollups.

It said that the RPC (remote procedure call) service layer's user-friendly interface facilitates integration.

Developers may “focus on building applications without worrying about the complexities of Layer 2 scaling,” it noted.

Adam Cochran of Cinneamhain Ventures questioned BNB Chain's scalability “because they centralized an Ethereum fork and turned up the gas limit to an unsafe level.”

Since there were alternative choices, such as joining Optimism as a “superchain,” becoming a layer-2 directly on Ethereum, or becoming a layer-3 on Optimism or Arbitrum, creating a fork “made no sense” he said.

BNB Chain has the third-most DeFi total value locked, after Ethereum and Tron, according to DefiLlama.

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