Arbitrum implements its largest scaling upgrade by migrating Arbitrum One to Nitro

Quick Take

  • Arbitrum has upgraded Arbitrum One, its current chain, to Arbitrum Nitro.
  • Arbitrum Nitro will reduce transaction costs and increase network speeds, said Arbitrum CEO Steven Goldfeder.


Arbitrum, one of the leaders in Layer 2 scaling, has upgraded Arbitrum One to Arbitrum Nitro.

The Nitro upgrade is expected to vastly increase network speeds and reduce transaction costs. The migration upgrade will reduce transaction costs through call data compression, increased Ethereum virtual machine (EVM) compatibility, and further advancing interoperability with Ethereum Layer 1, Arbitrum said in its Medium post earlier this month.

Arbitrum Nova, a separate chain focused on gaming and social, went live August 9 and is built on the Nitro stack. It is host to Reddit's community points blockchain initiative.

Arbitrum, as of this writing, has the highest total value locked (TVL) across all Layer 2 protocols, at about $2.5 billion, according to l2beat. Over the past week, Arbitrum has also surpassed the second leading optimistic roll-up chain Optimism in daily transaction count.


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Arbitrum Nitro launched its permissionless developer testnet in April, giving a first glimpse of the Nitro upgrade.

The announcement today officially replaces and migrates Arbitrum One, the current chain, to the new and improved Nitro chain after several months of testnet operations.

“We have released a robust stack in our overall mission to scale Ethereum, allowing users to experience reduced fees, increased capacity, and an overall faster and more efficient experience across the ecosystem.” said Arbitrum CEO Steven Goldfeder.


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About Author

Mike is a reporter on the crypto ecosystems team who specializes in zero-knowledge proofs and applications. Prior to joining The Block, Mike worked with Circle, Blocknative, and various DeFi protocols on growth and strategy.