Monero was under attack in the past 11 days, a Sybil attack trying to subvert the network reputation using a number of pseudo-anonymous identities, but the developers declared the attacker 'incompetent', as the recent updates were crucial in making the network resilient versus this kind of attack. They could observe more than six distinct actions: active injection into the peerlist of nodes, a bug manipulated to increase the chances of the malicious nodes to end up on friendly nodes list, dropping transactions for the purpose of making them fail or to get them stuck and few more script kiddies techniques. Using Tor as primary defence and Dandelion++ as the second layer of security, Monero resisted as the number of malicious nodes were not large enough to do damage to the network.
Many other blockchains such as Bitcoin and Chainlink did not dedicated a lot of resources to resist to a Sybil attack, but the cost is too big to do it effectively. Anyway, using flash loans from new, more advanced projects like XIO, this may be still possible, at least in theory.
Yours truly,
George
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