Earlier today, IOHK presented its checkpointing proposal to the Ethereum Classic (ETC) community. This is meant as a short-term solution for preventing future 51% attacks. In the past several weeks, the network has suffered a number of such attacks, which has cast doubt on ETC’s future. One of these attacks cost OKEx $5.6 million. In the wake of these problems, several exchanges increased validation times for ETC transactions.
Checkpointing consensus. Source: IOHK presentation.