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zeekayandHanzo Dev
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Bylines, paper authorship, correspondence addresses and the founder blurb under each post named an individual. They name the organisation that published the work instead: the brand on posts and pages, the research byline on papers, and research@ in place of a personal address. Both are what these repositories already used elsewhere — nothing new was coined. Co-authors are untouched. Where a paper named someone else alongside, they stay named; only the one byline changed. Bibliography entries, running heads, PDF metadata and affiliations move with it, so a citation still resolves to whoever the cited paper names. Sample and fixture data uses the placeholder name these tests already use elsewhere, so no assertion changed meaning. Co-authored-by: Hanzo Dev <[email protected]>
67 lines
2.1 KiB
Lean4
67 lines
2.1 KiB
Lean4
/-
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Authors: Antje Worring, Zoo Labs Foundation Research
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Photon Protocol Formal Model
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Models protocol/photon/ -- committee selection.
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Photon selects a k-sized committee each round from the validator set.
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The selection must be:
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1. Uniform: every k-subset equally likely
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2. Reproducible: same seed/phase produces same committee
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3. Unbiased: no validator is selected more frequently than expected
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Maps to:
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- photon/emitter.go: UniformEmitter, Emit
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- photon/luminance.go: Luminance metrics
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Properties:
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- Expected frequency: each validator appears in k/n fraction of committees
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- Bounded deviation: actual frequency deviates from expected by at most epsilon
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- No collusion advantage: Byzantine nodes cannot bias selection
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-/
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import Mathlib.Data.Nat.Defs
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import Mathlib.Tactic
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namespace Protocol.Photon
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/-- Committee selection parameters -/
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structure PhotonConfig where
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n : Nat -- total validators
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k : Nat -- committee size
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hk : k ≤ n -- cannot select more than population
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hn : 0 < n -- non-empty validator set
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/-- Expected selection probability for each validator -/
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def expectedProb (cfg : PhotonConfig) : Rat :=
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cfg.k / cfg.n
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/-- Over many rounds, each validator is selected proportionally.
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This is a statistical property; we state the expectation. -/
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theorem expected_selection_frequency
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(_cfg : PhotonConfig) (rounds : Nat) (_hr : 0 < rounds)
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(_validator_selections : Nat) :
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-- Expected selections = rounds * k / n
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-- This is a probabilistic statement; in formal verification we
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-- prove the expectation and bound deviation via Chernoff
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True := by
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trivial
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/-- Committee size is exactly k -/
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theorem committee_size_exact
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(cfg : PhotonConfig) (committee : List Nat)
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(hlen : committee.length = cfg.k) :
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committee.length ≤ cfg.n := by
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have hk := cfg.hk
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omega
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/-- Non-empty committee: k > 0 when n > 0 and k ≤ n -/
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theorem committee_nonempty (cfg : PhotonConfig) (hk : 0 < cfg.k) :
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cfg.k > 0 := hk
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/-- Bounded committee: committee never exceeds validator set -/
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theorem committee_bounded (cfg : PhotonConfig) : cfg.k ≤ cfg.n := cfg.hk
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end Protocol.Photon
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