[jakob223]

Consensus for every computation would be 2x as expensive, but you may be able to achieve something like it with randomly assigning 10% of the calculations to be double-checked, and double=checking more (all?) of a node's computations if it has an inconsistent result.

[timClicks]

BOINC has quite a sophisticated system, but it's a long time since I looked at the details. I believe new participants are subject to greater scrutiny.