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Arbitrum transaction activity rockets 550% since August: Delphi Digital

Following the Nitro upgrade, activity on Arbitrum has surged and has nearly two-thirds of the transaction activity seen on the Ethereum base layer.

Ethereum layer-2 scaling solution Arbitrum has seen a massive surge in activity since its Nitro update in August, having just clocked around 62% as many transactions as the Ethereum base layer.

In a Nov. 1 report, crypto research firm Delphi Digital noted that as of the week ended Oct. 24, Arbitrum’s number of total transactions has increased by 550% since August, citing data from Dune Analytics.

In an earlier Tweet, Delphi Digital initially phrased Arbitrum as accounting for 62% of all transactions on Ethereum, which they later clarified was "incorrect phrasing". 

Arbitrum is an optimistic roll-up built by blockchain development firm Offchain Labs, aimed at scaling Ethereum smart contracts. It uses Optimistic Rollup technology to bundle large batches of transactions off-chain from Ethereum smart contracts and decentralized applications before submitting them to Ethereum.

A number of well-known protocols use Arbitrum, such as decentralized exchanges SushiSwap, Uniswap and GMX, lending protocol Aave and liquidity transport protocol Stargate. According to L2Beat, at the time of writing it has a current total-value-locked (TVL) of $2.59 billion.

Delphi analysts noted that weekly active users had spiked on Arbitrum, having grown 125% since Oct. 10 to reach a new high of 282,000 in the week ending Oct. 24.

The analysts also suggest that much of the surge in activity is likely driven by speculators trying to boost their on-chain activity in the hope of receiving a larger airdrop for a native token which has been hinted at by Offchain Labs co-founder Steven Goldfeder.

On Aug. 31 the Arbitrum One mainnet upgraded to Nitro, which Offchain Labs claimed in an Apr. 7 post would result in reduced transaction costs while increasing network capacity, adding:

“While Arbitrum today is already 90–95% cheaper than Ethereum on average, Nitro cuts our costs even further.”

Related: White hat finds huge vulnerability in Ethereum–Arbitrum bridge: Wen max bounty?

The low fees have resulted in various players from within the crypto ecosystem wanting to integrate with Arbitrum One, and on Nov. 1 decentralized finance (DeFi) optimization tool Furocombo, capital raising protocol Aelin, and insurance protocol Y2K Finance each announced they were live on the popular scaling solution.

On Oct. 13 Offchain Labs announced they had acquired one of the core development teams behind the Ethereum Merge, Prysmatic Labs, which it hopes will enable greater communication and collaboration between developments on both layers.

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White hat finds huge vulnerability in ETH to Arbitrum bridge: Wen max bounty?

The ethical exploiter thanked Arbitrium for the 400 ETH payday, but said such a find should be eligible for the max bounty of nearly 1,500 ETH, or $2 million.

A self-described white hat hacker has uncovered a “multi-million dollar vulnerability” in the bridge linking Ethereum and Arbitrum Nitro and received a 400 Ether (ETH) bounty for their find.

Known as riptide on Twitter, the hacker described the exploit as the use of an initializing function to set their own bridge address, which would hijack all incoming ETH deposits from those trying to bridge funds from Ethereum to Arbitrum Nitro.

Riptide explained the exploit in a Medium post on Sept. 20:

“We could either selectively target large ETH deposits to remain undetected for a longer period of time, siphon up every single deposit that comes through the bridge, or wait and just front-run the next massive ETH deposit.”

The hack could have potentially netted tens or even hundreds of millions worth of ETH, as the largest deposit riptide recorded in the inbox was 168,000 ETH worth over $225 million, and typical deposits ranged from 1000 to 5000 ETH in a 24-hour period, worth between $1.34 to $6.7 million.

Despite the earning potential from the ill-gotten gains, riptide was thankful that the “extremely based Arbitrum team” provided a 400 ETH bounty, worth over $536,500, however they added later on Twitter that such a find “should be eligible for a max bounty,” which is worth $2 million.

Neither Arbitrum nor its creator company OffChain Labs have publicly commented on the exploit, Cointelegraph contacted OffChain Labs for comment but did not immediately hear back.

Related: ETHW confirms contract vulnerability exploit, dismisses replay attack claims

Arbitrum is a layer-2 Optimistic Rollup solution for Ethereum, clustering batches of transactions before submitting it to the Ethereum network in an effort to minimize network congestion and save on fees. Arbitrum Nitro launched on Aug. 31st, an upgrade aimed to simplify communication between Arbitrum and Ethereum as well as increasing its transaction throughput at lower fees.

Similar style bridge hacks have been successful for exploiters this year, notably the $100 million stolen from the Horizon Bridge in June and the recent Nomad token bridge incident in August which saw $190 million drained by the original and “copycat” hackers repeating the exploit.

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