A few days ago we had the reorganisation of the Ethereum Classic chain that was initially attributed to the mistake of a miner who has been disconnected from the network for 12 hours. Turns out it was an attack, and he or she made $5.6m out of it. Interestingly the playbook followed is well known [3], ht @edmund_schuster.

https://www.coindesk.com/ethereum-classic-undergoes-likely-51-attack-with-3693-block-chain-reorganization

https://blog.bitquery.io/attacker-stole-807k-etc-in-ethereum-classic-51-attack

https://arxiv.org/abs/2002.10736

https://twitter.com/Edmund_Schuster