Kelp DAO exploiter moves 50,700 ETH; Arbitrum freezes $71M tied to North Korea-linked hackers

CoinDesk April 21 roundup: 1) The attacker behind the Kelp DAO incident transferred 50,700 ETH. 2) Arbitrum froze $71 million in assets linked to North Korea-associated hackers. 3) The KelpDAO exploiter still holds 75,700 ETH on Ethereum, valued at about $175 million. 4) Dragonfly's Managing Partner said Arbitrum's Security Committee used emergency powers to move the attacker's funds. 5) Russia is considering criminal penalties for unlicensed crypto trading, including up to seven years of forced labor. 6) The total supply of USDT (TRC20) climbed to a new all-time high. 7) Spot Ethereum ETFs posted $67.77 million in net inflows yesterday, extending the streak to eight straight days. 8) BlackRock's Ethereum ETF drew close to $90 million. 9) Qivalis and 12 European banks are pushing forward a euro-backed stablecoin, with a launch targeted for the second half of 2026. 10) Vitalik suggested Chinese-language builders pair hardware strengths with open-source AI to pursue cross-domain innovation.