Bitcoin network hit by 200,000 fake nodes in possible stealth Sybil attack, warns developer Jameson Lopp

Starting April 9, 2026, Bitcoin's peer-to-peer network saw a sudden surge of over 200,000 fake node addresses, raising concerns of a stealth Sybil attack. Developer Jameson Lopp highlighted this anomaly, suggesting attackers aim to flood the network with fake nodes to isolate new or restarting nodes, potentially leading to an Eclipse attack. However, Bitcoin's design, including diversified connections and automatic subnet distribution, helps mitigate the risk. Currently, the attack mainly increases network load without directly threatening blockchain consensus, and the market has not significantly reacted to this development.