dgb(coin): SSOT for V36 PPLNS exponential weight-decay rate - #450
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Lift the decay-rate arithmetic shared by three open-coded copies in share_tracker.hpp (init_decay_table, get_v36_decayed_cumulative_weights, and the [PARENT-PPLNS] diagnostic dump) into coin/share_weight_decay.hpp: half_life = max(chain_length / 4, 1) decay_per = SCALE - (SCALE * 693147) / (1e6 * half_life) decayed_att = (att * decay_fp) >> 40 (40-bit fixed point) Conforms to frstrtr/p2pool-merged-v36 data.py get_decayed_cumulative_weights (the V36-native decayed PPLNS path; 3-bucket rule bucket-2 v36-native shared structure, distinct from the older p2pool-dgb-scrypt flat WeightsSkipList baseline that stays live during the crossing window). FENCED: header-only constexpr, share_tracker.hpp NOT rewired -- the byte-identity delegation of the three copies is the follow-on PR. The per-depth decay_fp accumulation (80-bit mul128_shift) stays in the caller's walk; the SSOT exposes only the rate constants and the final attempts shift. Non-circular KAT dgb_share_weight_decay_test (6/6): half_life, decay_per, and decayed_attempts goldens are hand-derived from the oracle formula (CL=8640 V36 / 2880 baseline / tiny-chain guard), not from the helper under test. Registered in both the test CMakeLists and the build.yml --target allowlist (#143 NOT_BUILT trap).
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…rewire dgb: rewire decay constants onto share_weight_decay SSOT (#450 follow-on)
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…p-ssot dgb: route consensus get_desired_version_weights clamp onto chain_walk_window SSOT (#450 follow-on)
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Phase-B SSOT pillar — V36 PPLNS exponential weight-decay rate
Lifts the decay-rate arithmetic shared by three open-coded copies in
src/impl/dgb/share_tracker.hppinto a new SSOT headersrc/impl/dgb/coin/share_weight_decay.hpp:init_decay_table()(decay-table precompute, ~line 170)get_v36_decayed_cumulative_weights()(hot-path PPLNS weights, ~line 1718)[PARENT-PPLNS]GENTX-mismatch diagnostic dump (~line 1793)All three compute the same constants:
Oracle / 3-bucket classification
Conforms to frstrtr/p2pool-merged-v36
p2pool/data.pyget_decayed_cumulative_weights(the V36-native decayed PPLNS path).This is bucket-2 (v36-native shared structure) — standardize cross-coin
toward this shape for the V37 unified migration. It is distinct from the older
p2pool-dgb-scryptflatWeightsSkipListbaseline (no decay), which stays thelive path during the crossing window and is not touched here.
Fenced
constexpr;share_tracker.hppis NOT rewired. Thebyte-identity delegation of the three copies is the follow-on PR.
decay_fpaccumulation is an 80-bit product done withmul128_shiftin the caller's walk — that stays inshare_tracker.hpp; theSSOT exposes only the rate constants and the final attempts shift.
src/impl/dgb/**+ the build.yml allowlist.No shared/bitcoin_family or other-coin tree.
Proof
dgb_share_weight_decay_test6/6 green. Non-circular: half_life /decay_per / decayed_attempts goldens are hand-derived from the oracle formula
(CL=8640 V36, CL=2880 baseline, tiny-chain half_life=1 guard), not from the
helper under test.
CMakeLists.txtand thebuild.yml--targetallowlist (default + AUX_DOGE arms) — avoids the ci: build test_dgb_subsidy in both Linux test jobs (fix master-red NOT_BUILT) #143 NOT_BUILTtrap.
No self-merge — integrator taps after full-rollup green.