ETC 51% attack was hit on 7/31/19 & 8/7/20 from the same attacker - a NiceHash rental. A $200k rent yielded $5.6M, $180K rent yielded $1.7M. Not a bad ROI.

This was attacker that was a supporter of the network since 2017 w/ 2.5% of the net hash rate. An insider, w/ 100 - 200 rigs on the network. Insider attack. When disgruntled Bitcoin mining pool? Trust no one.

The attacker was characteristic in their rental. Software used by the attacker was the same in 2020 and 2019.

You need to have nodes to broadcast transactions to the main network, in addition hash power, to capitalize on the window of opportunity. When the work is pushed to the main chain and attacked, can go to the exchange and double spend! Brilliant.

Still an active miner, the balls on this attacker!

If anyone thinks PoW mining is anonymous, this presentation should dispel that notion. Nothing is private about Bitcoin or Ethereum mining given proper data aggregators, nonce analysis, and power grid usage.

Winning nonces can identify Monero ASICs. Fingerprinting can be used to hone in on compute providers that are obfuscating behind hardware.