Sv2 flips the inversion of trust and the downstream miner is telling the pool what they mine on via custom job declaration. YOU control the coinbase and opt into pooled mining. Or you fall back to solo mining.

As for auditing shares, y'all need to deep dive PPLNS-JD from DMND. They have an audit mechanism built in that I provided some small feedback to. Ehash will provide auditing too.