[dezren39]

What

Investigation/design document for #2037 (LIST 10a): match-result attestation — mutual concession, witness adjudication, offline play.

Lands the wave-1 investigation (queue task 3350, 2026-10-29, recorded only as an issue comment at the time) as a repository document, re-verified against current main (c90fcbc), plus the worked examples the first pass did not include.

Contents

• Verdict: primitives exist (signed chained events, provable fork/equivocation in the event store); no attestation/witness/result objects exist in pkgs/id/src today (re-verified by code search 2026-10-30).
• Object shapes: match agreement (genesis), result claim, witness decision, objection, frontier evidence.
• Result state machine (mermaid): proposed → agreed → final · witnessed · disputed · void, and counting views (id: investigate: trust/visibility model — servers accept all signed objects; views count only allowed writers #2030).
• Witness selection/trust: genesis-named witness or no standing, non-submission rule, quorum variant, public track record.
• Objection windows incl. the offline frontier rule + outer wall-clock cap; disputes resolve via the id: investigate: match audit — netcode log format, replay validation, and cheating signals #2038 audit replay.
• Worked examples: conceded game, witnessed game, objected result, offline game synced later.
• Abuse cases (8) and the open decisions handed to the id: design: match attestation + audit v1 #2039 synthesis — id: investigate: match audit — netcode log format, replay validation, and cheating signals #2038's investigation is complete, so with this doc both id: design: match attestation + audit v1 #2039 inputs exist.
• Follow-on: PoC id: PoC: mutual-concession match attestation on the tic-tac-toe example — genesis agreement + dual signed result claims, offline-first (from #2037) #2248 already filed + enqueued (task 3403); no permanent feature on the PoC without review.

Docs-only change; no code touched.

Queue task 3921 (repo-health-code-pilot), lane E. Closes #2037 on merge.

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