A user reportedly lost approximately $1.58 million across Ethereum and Base networks in a suspected private key leak incident, according to security monitoring firm Scam Sniffer. The losses spanned both the main Ethereum network and Coinbase's Layer 2 scaling solution Base, indicating the compromised key granted access to assets on multiple chains simultaneously. Private key leaks remain one of the most devastating attack vectors in crypto, as they provide full control over associated wallets without requiring phishing or smart contract exploits.