tevador proposes 'Share or Perish' selfish mining mitigation

RandomX¹ author tevador² has published a new soft-forking proposal to mitigate selfish mining³ - Share or Perish (SoP)⁴ - that could potentially be much more resilient to long reorgs:

For deeper reorgs of 10+ blocks, the attacker would need to mine on average 80 work objects faster than the honest chain. [..] the attacker would have a 50% chance of success after 5-6 years of selfish mining. With Nakamoto consensus, the attacker can expect to achieve several 10-block reorgs per day.

SoP doesn’t affect rewards or other consensus rules and is partly based on tevador’s previous Publish or Perish (PoP)⁵ proposal combined with the idea of workshares⁶.

Consult the previous Monero Observer report⁷ to learn more about the ongoing attack against Monero.

This is an ongoing story and the report will be updated when new information is available.

Update: actual average time between 10+ block reorgs is not 5-6 years, but only about 65 days according to preliminary Monte Carlo simulations⁸.