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docs: Layer 2 round 2 — resolve 5 questions + access-grant primitive

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Fold in Scott's answers:
- Per-post (pub_x, priv_x); confirmed.
- Random rand(32..=128) dummy padding replaces power-of-2 buckets;
  dummy pubkeys in pub_post_set so .len() == wrap_slots.len(). Floor
  count is unrecoverable across multiple posts.
- Non-FoF UX: "Comments are private" + optional "Request access via
  DM" button. No count leak.
- Author's own (pub_me, priv_me) in pub_post_set; confirmed.
- Revocation is retroactive delete + forward: file-holders delete
  locally-stored comments signed by revoked pub_x on diff arrival,
  then propagate. Stronger than stop-forwarding.

New primitive: access-grant author comment. Author appends a
WrapSlot + pub_post_set entry for a newly-vouched persona via a
signed special comment — retroactive read widening without republish.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Scott Reimers 2026-04-24 10:37:24 -04:00
parent 553fbd3a20
commit a79cab049f
2 changed files with 92 additions and 24 deletions
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18
sessions.md
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@ -65,6 +65,24 @@ See `CONTRIBUTING.md` for the protocol. See `AGENTS.md` for the Claude-specific
**Stopping point**: commit `b8b38a6` (Layer 1) + new commit for Layer 2 both on branch; not merged. Awaiting Scott.
### Update 2026-04-24 — Layer 2 round 2 (Scott answers all 5 questions)
Scott resolved all five open questions:
1. **Per-post `(pub_x, priv_x)`** — confirmed.
2. **Random-count dummy padding** (`rand(32..=128)`) replaces power-of-2 buckets, with dummy pubkeys in `pub_post_set` so `.len() == wrap_slots.len()`. Across multiple posts from the same author, an observer cannot even establish a reliable floor for the real vouch-set size.
3. **Non-FoF comment UX**: "Comments are private" affordance with optional "Request access via DM" button. No count leak.
4. **Author's own entry in `pub_post_set`** — confirmed.
5. **Revocation is retroactive delete + forward.** File-holders delete locally-stored comments signed by the revoked `pub_x`, then propagate the diff. Stronger than stop-forwarding — prior garbage is cleaned up as the diff sweeps the mesh.
**New primitive**: **access-grant author comment**. Author can retroactively widen a post's read-set by publishing an author-signed special comment appending a new `WrapSlot` + `pub_post_set` entry. Lets a newly-vouched persona gain read + comment access without republishing the whole post. Answers the "non-FoF requests access via DM, author approves" UX loop.
**Files touched**:
- `docs/fof-spec/layer-2-mode2-fof-comments.md` — updated Lead decisions, post-header, revocation flow (retroactive), added Access-grant author comment section, updated Privacy tradeoff (size-leak analysis with random padding), Open questions split into unresolved + Resolved, size budget, ship criteria.
- `sessions.md` — this entry.
Commit pending.
---
## 2026-04-23 — primary Claude (Lead) — `docs/fof-spec-skeleton`