[Fix] Use previous block for proof target. #2422
Merged
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Motivation
This PR adjusts proof targeting to use the previous block. This ensures that the targets are symmetric in block production and verification.
Test Plan
Added a test that checks that the cumulative proof target is calculated correctly and that block (with varying solutions at varying targets) is well-formed. This test triggers the failure, when the fix is removed.
This PR depends on #2421.