dgb: EmbeddedCoinNode — second build_work_template caller (Stage 4d) - #222
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June 19, 2026 16:43
…rk template (Stage 4c) HeaderSample gains a sha256d block-id slot (block_hash, u256; 0 == not populated here, the same sentinel pow_hash uses) and HeaderChain gains a tip_hash() accessor returning the newest header's id or nullopt when the chain is empty / the tip carries no hash. get_current_work_template emits previousblockhash as GBT-conventional big-endian display hex ONLY when tip_hash() is present -- a truthful conditional, never a fabricated hash. The embedded P2P header-download -> validate_and_append ingest that populates block_hash lands in a following slice; until then tip_hash() is nullopt and previousblockhash is held back exactly as before. bits stays HELD BACK: the only embedded next-target source is the DigiShield damped multiply, which DGB Core runs as MultiShield V4 (a global window across all 5 algos == V37); a Scrypt-only walk cannot reconstruct it, so the ingest path demotes that gate to a no-op. Emitting a digishield-derived bits would be a known-wrong value. The authoritative bits is the external-daemon GBT value, not plumbed into this embedded path yet -- surfaced as [decision-needed]. Fenced to src/impl/dgb (4 files); test cases added to existing targets header_chain_test (31 -> 35) and dgb_work_source_test (15 -> 16), no new gtest target so the build.yml allowlist is unchanged. Both green.
The Stage-4b prevhash getter still returned {} while get_current_work_template
emits previousblockhash from chain_.tip_hash() (#216). Route the getter through
the SAME tip_hash() accessor and u256_be_display_hex formatter so the dedicated
getter and the assembled template cannot silently diverge: one truthful source.
Empty string when tip_hash() == nullopt (empty chain / unpopulated block_hash
sentinel) -- a truthful absence, never a fabricated id. Non-consensus read-only
getter, fenced to src/impl/dgb. +1 test asserting getter == template field on a
seeded tip and joint-absence with no tip; dgb_work_source_test 17/17.
…age 4c) Lift the GBT-shaped template assembly out of DGBWorkSource::get_current_work_template() into a free function dgb::coin::build_work_template() in coin/template_builder.hpp, so the stratum work source and the embedded path emit ONE template object and cannot diverge. Pure non-consensus shaping: the consensus-bearing coinbasevalue is still resolved by the caller through the #207 resolve_coinbase_value -> subsidy_func SSOT and passed in verbatim; the builder never recomputes or scales it. version (Scrypt lane pin via DGB_BLOCK_VERSION_SCRYPT), mintime (MTP+1, 0 on empty chain), curtime, empty transactions[] and the truthful conditional previousblockhash all move into the builder unchanged. bits stays held back (MultiShield V4 next-target is V37). Behaviour-preserving: dgb_work_source_test 17/17 unchanged (incl the prevhash getter == template field joint-absence assertion). New guard-weight dgb_template_builder_test 7/7 pins the invariants (Scrypt pin, coinbasevalue pass-through, mintime/empty-chain, empty transactions + no bits, prevhash conditional, determinism). Wired into ctest + both build.yml allowlists (#143 NOT_BUILT trap avoided).
Wire the build_work_template SSOT (Stage 4c, #219) into the embedded work path so it has a REAL second caller. Until now build_work_template had a single caller (DGBWorkSource::get_current_work_template), leaving its "the embedded path and the stratum path cannot emit a divergent template" claim theoretical; the embedded path being the second caller proves it. New coin/embedded_coin_node.hpp: EmbeddedCoinNode implements the existing CoinNodeInterface::getwork() (coin/template_builder.hpp) by assembling a GBT-compatible template ENTIRELY from in-process embedded chain state -- the HeaderChain (next_block_height / median_time_past / tip_hash) plus the coin subsidy schedule -- with NO external RPC. make_inputs(curtime) is split out so the assembly is deterministically testable; getwork() supplies std::time(nullptr) exactly as the stratum caller does. Consensus discipline identical to the stratum caller (pure non-consensus shaping): - coinbasevalue resolved through the #207 resolve_coinbase_value -> subsidy_func SSOT. Embedded path has no external GBT figure, so it is derived as subsidy_func(height)+total_fees (total_fees 0 until embedded mempool tx selection is wired). The external-daemon GBT fallback (NodeRPC::getwork) is a SEPARATE path and stays untouched. - version pins the Scrypt lane; transactions[] empty (no fabrication); previousblockhash emitted ONLY when tip_hash() carries a real id; bits HELD BACK (MultiShield V4 next-target == V37). New coin/hash_format.hpp lifts u256_be_display_hex out of work_source.cpp into a dgb::coin SSOT so the stratum and embedded callers render previousblockhash in one byte-encoding -- the same anti-divergence intent. work_source.cpp now consumes it via a using-declaration; behaviour preserved (dgb_work_source_test 17/17 unchanged, dgb_template_builder_test 7/7 unchanged). New dgb_embedded_coin_node_test 5/5: SSOT routing (node == build_work_template for the same inputs), coinbasevalue via subsidy_func, prevhash truthful absence + byte-identical emit, getwork no-fabrication. Wired into ctest + both build.yml --target allowlists (#143 NOT_BUILT trap avoided). Fenced to src/impl/dgb only; build EXIT=0.
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Stacked on #219 (where build_work_template lives). Wires the build_work_template SSOT into the embedded work path so it has a REAL second caller — proving the embedded + stratum paths cannot emit a divergent template (integrator directive 2026-06-19).
HOLD merge — lands behind the #211->#216->#217->#219 operator-tap stack.