The gap between nominal vote weight and actual power is measured in the same vocabulary by a 1979 CS replication protocol and a 1968 law-review critique — but the 2024-25 EU crypto regulators' texts do not use the word 'quorum'; the regulatory echo was a law firm's

cross-domain-bridgevoting-theoryquorumdistributed-systemslawregulationdefi

(Promotion title, 2026-07-11: "The gap between nominal vote weight and actual power is measured, in the same vocabulary, by a 1979 CS replication protocol, a 1968 law-review critique, and 2024-25 EU crypto regulators." Frontmatter retitled 2026-09-11; heading brought into line 2026-09-12 — see title_history and audit_status.)

Three fields, across five decades, reach for the same two words — weighted voting and quorum — to reason about who really controls a collective decision:

• Computer science (mechanism). Gifford's 1979 Xerox PARC protocol assigns each replica a number of votes and demands read/write quorums summing to more than the total, so reads always overlap the latest write. It supplies the vocabulary and the arithmetic of quorums.
• Law (critique). Banzhaf's 1968 power index, a decade earlier, had already shown that in weighted-voting bodies, power is not proportional to weight — it is a nonlinear function of the quorum/threshold structure, measured by how often a member is pivotal.
• Regulation (reuse). EU crypto regulators in 2024-25 reportedly test whether a DAO is "sufficiently decentralized" by asking whether one holder can meet quorum alone — Gifford's word, Banzhaf's worry, now a legal control test. [Corrected 2026-09-11: not so. Both primaries read directly; neither the Danish FSA's June 2024 principles nor the EBA–ESMA January 2025 report contains the word "quorum." The "meet quorum alone" sentence is Aurum Law's own formulation (Jan 2026). What the regulators do state is a majority-control test — the FSA's example of "a single person [who] holds over 50% of the governance tokens," the EBA–ESMA "51% governance attack" — which is Banzhaf's worry in the regulators' own words, without Gifford's word. The sentence before this bracket is the promotion wording, kept for the record.] The modern empirical instance (a16z drawing outsized delegated votes in Uniswap despite decentralization branding) is folded into the Banzhaf note.

The honest shape of the bridge: it is a terminological and structural echo, not a true tri-fold convergence. Gifford was not measuring a power gap at all — his quorum is a consistency mechanism, indifferent to fairness. The genuine conceptual line runs Banzhaf → regulators (weight ≠ power); Gifford contributes the word and the quorum arithmetic that the regulators' formulation happens to reuse. And the regulatory leg is [unverified-mechanism] — it rests on a law-firm paraphrase, so even the reuse is not yet confirmed against primary text. [2026-09-12: now confirmed in the negative — both primaries were read on 2026-09-11 and neither reuses the word; see the bracket in the Regulation bullet above. Sentence kept as promoted.]

This is the non-allegorical sibling to Lamport's Paxos, where distributed consensus was dressed as a parliament metaphorically; here the voting vocabulary is literal and quantitative on all three sides. The synthesis stays seedling pending question-verify-mica-danish-fsa-eba-esma-decentralization-quorum-test-primary. [2026-09-12: that question is answered (in _answered/) — resolved negatively on 2026-09-11. The note stays seedling on the ordinary first-note maturation basis, not on a pending verification.]