dgb: embed-at-mint MM commitment into coinbase scriptSig (phase DB) - #486
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Wire the AuxPoW merged-mining commitment into the per-connection coinbase assembler so a won DGB block, built as the DOGE merged-mining parent (-DAUX_DOGE=ON), carries the 44-byte MM tag (magic fabe6d6d || aux_root32 BE || size4 LE || nonce4 LE) the aux verifier decodes. ConnCoinbasePplnsInputs gains an optional aux_mm_commitment carrying the pre-built tag; build_connection_coinbase_from_pplns appends it to the coinbase scriptSig when present. DEFAULT nullopt leaves the scriptSig -- and therefore the whole gentx -- BYTE-IDENTICAL to the standalone-parent build: the no-op is structural, so the default V36 DGB build cannot regress. The producer (main_dgb seam) only ever populates the field under #ifdef AUX_DOGE; sourcing a LIVE aux merkle root is the gated DC routing slice and is not wired here. Per the integrator core=SSOT adjudication, the commitment blob is consumed as a read-only product of the canonical builder c2pool::merged::build_auxpow_commitment (shared A-level merged_mining.cpp / coinbase_builder.hpp). This slice carries no DGB-local layout logic and makes no edit to the 44-byte layout or the shared DOGE-aux seam; it is independent of #475 (the SSOT KAT-pin) -- both pin to the same core builder. Fenced to src/impl/dgb/; zero ltc/doge tree edits. KAT (connection_coinbase_test, runs in both default and AUX_DOGE arms): E1 NulloptIsByteIdentical -- nullopt == no-aux gentx, txid-identical E2 AppendsMmTagToScriptSig -- gentx grows by EXACTLY 44 bytes, tag bytes match the core SSOT output, scriptSig == baseline || tag 10/10 green both arms (default + -DAUX_DOGE=ON).
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Pure, header-only DC decision contract the eventual DC run-loop wiring (AUX_DOGE node seam + submit) must satisfy, landed BEFORE the seam is touched (seam parked on #82 + ltc-doge written concurrence). coin/aux_dual_target_select.hpp: - aux_mint_decision(aux_enabled, has_doge_job): embed the fabe6d6d MM commitment IFF aux MM enabled AND a DOGE job is present; else no-op (mirrors #486 embed-at-mint nullopt byte-identity). - select_submit(pow, dgb_target, has_doge_job, doge_target): independent per-path thresholds against one scrypt pow_hash (mirrors dc_proof DualTargetIndependentThresholds); DOGE-aux only fires when minted. - selection_is_consistent(): load-bearing DC<->DB guard, fire_doge_aux ==> embed_commitment, coupling submit back to #475/#486. test/aux_dual_target_select_test.cpp: 5/5 KATs, non-circular goldens (fabe6d6d tag, embed truth table, independent threshold table, no-job suppression, the impossible DOGE-win-without-mint state). Registered in test/CMakeLists.txt + both build.yml --target allowlists (#143 trap). Fenced dgb/, not rewired, consumes nothing in src/impl/doge, no node seam touch, zero consensus surface.
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Pure, header-only DC decision contract the eventual DC run-loop wiring (AUX_DOGE node seam + submit) must satisfy, landed BEFORE the seam is touched (seam parked on #82 + ltc-doge written concurrence). coin/aux_dual_target_select.hpp: - aux_mint_decision(aux_enabled, has_doge_job): embed the fabe6d6d MM commitment IFF aux MM enabled AND a DOGE job is present; else no-op (mirrors #486 embed-at-mint nullopt byte-identity). - select_submit(pow, dgb_target, has_doge_job, doge_target): independent per-path thresholds against one scrypt pow_hash (mirrors dc_proof DualTargetIndependentThresholds); DOGE-aux only fires when minted. - selection_is_consistent(): load-bearing DC<->DB guard, fire_doge_aux ==> embed_commitment, coupling submit back to #475/#486. test/aux_dual_target_select_test.cpp: 5/5 KATs, non-circular goldens (fabe6d6d tag, embed truth table, independent threshold table, no-job suppression, the impossible DOGE-win-without-mint state). Registered in test/CMakeLists.txt + both build.yml --target allowlists (#143 trap). Fenced dgb/, not rewired, consumes nothing in src/impl/doge, no node seam touch, zero consensus surface.
frstrtr
added a commit
that referenced
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Jun 25, 2026
Pure, header-only DC decision contract the eventual DC run-loop wiring (AUX_DOGE node seam + submit) must satisfy, landed BEFORE the seam is touched (seam parked on #82 + ltc-doge written concurrence). coin/aux_dual_target_select.hpp: - aux_mint_decision(aux_enabled, has_doge_job): embed the fabe6d6d MM commitment IFF aux MM enabled AND a DOGE job is present; else no-op (mirrors #486 embed-at-mint nullopt byte-identity). - select_submit(pow, dgb_target, has_doge_job, doge_target): independent per-path thresholds against one scrypt pow_hash (mirrors dc_proof DualTargetIndependentThresholds); DOGE-aux only fires when minted. - selection_is_consistent(): load-bearing DC<->DB guard, fire_doge_aux ==> embed_commitment, coupling submit back to #475/#486. test/aux_dual_target_select_test.cpp: 5/5 KATs, non-circular goldens (fabe6d6d tag, embed truth table, independent threshold table, no-job suppression, the impossible DOGE-win-without-mint state). Registered in test/CMakeLists.txt + both build.yml --target allowlists (#143 trap). Fenced dgb/, not rewired, consumes nothing in src/impl/doge, no node seam touch, zero consensus surface.
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Phase DB embed-at-mint, re-opened off current master per integrator core=SSOT adjudication (concurrence chain unanimous: ltc-doge-production-steward + dgb).
What: ConnCoinbasePplnsInputs gains an optional
aux_mm_commitment;build_connection_coinbase_from_pplnsappends the pre-built 44-byte AuxPoW MM tag (magic fabe6d6d || aux_root32 BE || size4 LE || nonce4 LE) to the coinbase scriptSig when present. DEFAULT nullopt -> gentx BYTE-IDENTICAL to standalone-parent build (structural no-op; default V36 build cannot regress).SSOT invariant: consumes the canonical
c2pool::merged::build_auxpow_commitmentas a read-only product; no DGB-local layout logic, no edit to the 44-byte layout or the shared DOGE-aux seam. Independent of #475 (the SSOT KAT-pin) — both pin to the same core builder, so this is mergeable off master without #475 landing first.Not wired here: sourcing a LIVE aux merkle root (the producer only populates the field under #ifdef AUX_DOGE) is the gated DC routing slice.
KAT (dgb_connection_coinbase_test, both arms):
10/10 green default + 10/10 green -DAUX_DOGE=ON. Fenced to src/impl/dgb/; zero ltc/doge edits. GPG-signed. NO self-merge — operator tap.