dgb: per-connection Stratum coinbase assembler + coinb1/coinb2 split SSOT - #327
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…SSOT Add coin/connection_coinbase.hpp: build_connection_coinbase_parts() builds the prospective next-share gentx for one Stratum connection via the assemble_gentx_coinbase SSOT, then splits it into the Stratum coinb1/coinb2 pair around the OP_RETURN 8-byte extranonce slot so that coinb1 || extranonce1(4) || extranonce2(4) || coinb2 reconstructs the exact gentx bytes the submit path validates. KAT (4) pins the assembled bytes byte-identical to the canonical frstrtr/p2pool-dgb-scrypt oracle wire (same NOSEG vector as the gentx assembler KAT) and the split invariant. Pure / no tracker dependency. Fenced to the DGB tree; runtime byte-unchanged (new file + test only).
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dgb(phase-b): wire per-connection coinbase payout split to PPLNS SSOT (#327-gated follow-on)
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dgb: per-connection Stratum coinbase assembler + coinb1/coinb2 split SSOT
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Phase B pillar (per the integrator hand-off after #322): implement the per-connection coinbase assembly.
What
src/impl/dgb/coin/connection_coinbase.hpp:build_connection_coinbase_parts()assembles the prospective next-share gentx for one Stratum connection through the existingassemble_gentx_coinbaseSSOT, then splits it into the Stratumcoinb1/coinb2pair around the OP_RETURN 8-byte extranonce slot.coinb1 || extranonce1(4) || extranonce2(4) || coinb2 == full gentx bytes— the reconstructionmining_submitrelies on.build_ref_op_return(): canonical6a28 || ref_hash(32) || last_txout_nonce(8 LE)commitment, byte-identical to the verification SSOT in share_check.hpp.Conformance
KAT (4/4 local) pins the assembled bytes byte-identical to the canonical
frstrtr/p2pool-dgb-scryptoracle wire (reusing the same NOSEG ground-truth vector as the gentx assembler KAT) plus the split invariant. Pure / no tracker dependency, so the vector is the oracle serializer output, not self-generated.Scope / safety
coin/+test/) + the build.yml--targetallowlist (both arms). No shared / bitcoin_family / core / ltc / doge touch.DGBWorkSource::build_connection_coinbase()still returns the empty stub. The live PPLNS payout-map + ref_hash tracker-seam wiring into the work source is the next stacked slice.