# Arbitrum KelpDAO Recovery, Base Azul Upgrade, Coinbase Quantum Paper

> Arbitrum's Security Council freezes $71M tied to the KelpDAO exploit. Base's Azul upgrade introduces multiproofs. Optimism launches Privacy Boost.

**Published by:** [ETH Daily](https://ethdaily.io/)
**Published on:** 2026-04-22
**Categories:** news, 2026, april2026
**URL:** https://ethdaily.io/930

## Content

Quick TakeArbitrum freezes 30k ETH.Base announces Azul upgrade.Coinbase quantum paper.OP Labs ships Privacy Boost SDK.Arbitrum Freezes 30,766 ETH From KelpDAO ExploiterListen to this episode from ETH Daily Crypto News on Spotify. Arbitrum freezes 30k ETH from the KelpDAO exploiter. Optimism introduces the Privacy Boost SDK. Base announces Azul upgrade. And Coinbase releases a paper on quantum and crypto. Read more: https://ethdaily.io/930 Sponsor: Lido Earn lets you deploy ETH or stablecoins into curated DeFi strategies for optimised yield.https://spotify.comSponsored by EarnUSD is a stablecoin vault by Lido for earning transparent, onchain USD-denominated rewards. Get started today at stake.lido.fi/earnArbitrum Freezes 30,766 ETH From ExploiterThe Arbitrum Security Council executed an emergency upgrade to freeze 30,766 ETH from an address involved in the KelpDAO exploit, moving $71 million into a frozen intermediary wallet. The council briefly modified the inbox contract on L1 to include a function enabling cross-chain messages that could impersonate any sender, used it once to transfer the funds, then restored the contract. The Arbitrum DAO will decide the next steps. Read more →Base Introduces Multiproofs With Azul UpgradeBase announced the Azul upgrade, its first standalone network upgrade. It introduces multiproofs and brings Base closer to Stage 2 decentralization. The upgrade also consolidates operations onto base-reth-node and a new base-consensus client built on Kona. Azul is now live on testnet with mainnet activation set for May 13, 2026. Base is also hosting a $250,000 audit competition through May 4. Read more →Coinbase Publishes Quantum Readiness PaperThe Coinbase Quantum Advisory Council released its first position paper examining quantum computing's impact on cryptocurrency. The report concludes that current cryptographic systems remain secure today, but advances in quantum computing could compromise crypto security within the next decade. Specifically, current wallet-level signature schemes are significantly more vulnerable. Read more →Optimism Launches Privacy BoostOptimism introduced Privacy Boost, a plug-and-play SDK for adding confidentiality to any OP Stack chain. The release aims to help projects meet regulatory requirements such as MiCA, BSA, AML/KYC, and GDPR. Privacy Boost combines zero-knowledge proofs with trusted execution environments on a UTXO-based model, generating proofs in under 500 milliseconds, and features a forced withdrawal option. Privacy Boost is now live on OP Mainnet. Read more →Other NewsEthereum fellowship Cohort 6 recapAave unfreezes Ethereum core WETHMantle working with Aave on recoveryMantle transitions to ZK RollupEtherealize path to $250k ETHHow EEZ unifies EthereumAztec Dev Fundamentals courseOpenGradient launches on BaseDisclaimer: Content is for informational purposes only, not endorsement or investment advice. The accuracy of information is not guaranteed.

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