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Settles E1-E4 and E6 of handoff-fork-loss-validation.md against spec d6fd7648.
E1 costs nothing and reframes everything: analysis-block-times-blend-network.md
sets blending_delay as a FIXED per-hop dwell (the 3d+5 max-delay arithmetic
gives 14 s at d=3 and 11 s at d=2, matching its prose), not a mean or a bound.
The simulator's Uniform(0, delta_max) matches a 2 s dwell in the mean at
delta_max = 4, so D_vis = 8 s and rho = 0.27 -- inside the committed 40-replicate
paired design band, which answers C1-C3 from data of record.
C1 refuted: every U>=1 cell sits at 0.9985-0.9997, not 0.986. C2's mechanism is
right but its size is ~17x over: the paired first-fork cost is 0.08 pp pooled
(95% CI [0.03, 0.13], t = 3.08), resolved only because the arms share streams --
the U=0 negative control is exactly 0.00000 +- 0.00000. C3 is refuted in the
UNFAVOURABLE direction: the no-uncle loss is 33% at N=1000 and 34.6% at N=5000
(42% / 49.5% at delta_max = 8), so the section understates what uncles buy by
about half. C4 stands with ~7x margin (U=3 still recovers at rho = 1.87). C5 is
right in effect, wrong in wording -- the knee is at W_abs ~ 5, so the spec's 10
is ~2x above it, which is "has margin", not "never binds".
C6 is the section's real omission. The deployed estimator quantises the target
rate at PRECISION = 1e3, and measured in the full dynamics that reads
1.01026 +- 0.00056 against a closed form of 1.0101 -- a 1.0% bias ~13x the
first-fork cost the section is concerned with, opposite in sign, removed by a
one-constant change. It could not be measured before because PRECISION was a
module constant pinned at the RECOMMENDED 1e6; f_precision is now a config
field, appended to the RNG key only when non-default so no committed run moves.
Also from the guide: uncle_window_slots now floors rather than rounds, matching
w_u := floor(W/f) (identical at the defaults; matters only for the W and f
sweeps).
Reviewed sec 4.3's argument as sec 6 asks, and it holds -- inclusion stayed soft
("may reference fewer uncles than it could ... and its block remains valid"), so
row 10, the anti-mandate argument and the suppress adversary are all unaffected;
only the CONTENT of a reference became validity-gated. One correction: the
"no incentive to deviate" clause does still exist, so sec 8.5's implication (ii)
is live, not moot.
E5 -- the jitter diagnostic, and the only experiment that could invalidate the
report rather than the section -- is not run and is flagged as such.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
35 lines
2.5 KiB
YAML
35 lines
2.5 KiB
YAML
# Handoff E2, the size arm: does the no-uncle loss deepen with N at the SPEC's operating point?
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#
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# The design-band study (fine-delay-paired.yaml) already settles the countable-vs-unrestricted
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# question at delta_max = 4 with 40 replicates, but only at N = 1000. Claim C3 of the handoff
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# ("without uncles the loss is 18.7 %") is the U = 0 column, and the report shows that column is
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# N-dependent (0.739 -> 0.635 over N = 1k -> 10k) at delta_max = 8. This measures it at the
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# deployment's own delay instead, where nothing has been run at N > 1000.
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#
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# delta_max = 4 is the E1 answer: the spec's blending_delay is a FIXED 2 s per-hop dwell, and the
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# simulator's Uniform(0, delta_max) matches it in the mean at 4. D_vis ~ 8 s, rho ~ 0.27.
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#
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# Run TWICE — default (countable) and with --old — so the first-fork gap is measured at this size
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# too. `--old` is NOT a candidate design: under the current spec a block carrying a deep-fork
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# reference is REJECTED, so the unrestricted arm is an unreachable upper bound on what any
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# counting rule could recover. It is kept as exactly that ceiling.
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# Latency is in SLOTS (1 slot = 1 s).
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n_nodes: [5000] # the size arm; N = 1000 is already committed
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stake_dist: [pareto] # heavy-tailed (realistic) stake distribution
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topology: [blend] # Blend mixnet — the deployment transport
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degree: [6] # peering degree of the d-regular graph
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link_latency_mean: [0.5] # natural geographic transport (sub-slot)
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link_latency_dist: [geo] # real-world geographic band mixture
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blend_hops: [3] # the spec's Blend cascade length
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blend_delay_max: [4.0] # E1: the spec's 2 s dwell, matched in the mean
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max_uncles: [0, 1, 2, 4] # 0 = the C3 column; 4 = the spec's MAX_UNCLES
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uncle_strategy: [oldest] # spec Uncle Selection
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init_dest: [common] # per-node initial D_est from agreement
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replicates: 12 # N = 5000 at true k is heavy; 12 gives ~±0.2 pp
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base: # per-run settings shared by every cell
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k: 2160 # true security parameter
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epochs: 20 # equilibrium within ~2 epochs; burn 50%
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f: 0.03333333333333333 # slot activation coefficient (1/30)
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genesis_d_factor: 0.5 # start near true stake (cheap epoch 0)
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early_stop: true
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