Target-aware selector on partial second-SHA state
A frozen linear score of partial second-SHA state can select nonces that beat uniform completion under equivalent SHA-round work.
Diagnostic work, exact algebra and local capabilities are not treated as end-to-end mining advantage.
What was tested?
A frozen linear score of partial second-SHA state can select nonces that beat uniform completion under equivalent SHA-round work.
Why the test is meaningful
Selector cost must include the first SHA, the evaluated second-SHA prefix and completion of selected nonces; uniform controls receive exactly the same round budget.
gain_Bk = hits_selected(Bk)/hits_uniform_equal_work(Bk)frontiers={16,24,32,40,48,56}gate: gain≥1.05 on 4/4 unseen headersHow it was tested
Discover on four headers, freeze round 16 with one-half selection, then replicate unchanged on four unseen headers over 262,144 nonces each.
What happened
The exact tracer passed 128/128 probes plus a 32/32 smoke test. Replication gains were 0.602669× at B8, 0.603381× at B12 and 0.588235× at B16; B12 lost on 4/4 headers.
Exactness and statistical controls
Uniform controls were work-equivalent, the selector was frozen before replication and all traced digests matched hashlib.
What the result means
This linear-bit selector family cannot repay work invested before selection and is closed.
Limitations
- Only registered linear 64-bit scores were tested.
- Other representations require fresh preregistration.
- No validation/test split was opened after failure.
Evidence trail
Freeze the selected frontier on discovery, apply it unchanged to unseen headers and compare against an equal-round uniform baseline.
Canonical variants
CANONICAL-EXP-136PREREGISTERED-CAMPAIGNSEALED-AUDITSource: internally audited canonical reports. Local filesystem structure, private headers and operational identifiers are excluded from publication.