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752cbfc037
Adds the media/Blossom possession-proof exception section to
\`docs/nips/NIP-FI.md\`.
## What this changes
Encodes the condition set confirmed by Thufir's security review
(2026-09-03) as normative MUSTs in NIP-FI. Kind-24242 Blossom auth
events are admitted as the NIP-FI pairing possession proof for **media
routes only** — a named, bounded exception with an explicit precedent
fence against expansion.
### Scope fence
Kind-24242 proofs are valid only on:
| Proof type (`t` tag) | Valid route | Method |
|---|---|---|
| `upload` | `PUT /upload` (and temporary alias `PUT /media/upload`
until removed) | PUT |
| `get` | `GET /media/{hash…}`, `HEAD /media/{hash…}` | GET, HEAD |
All other protected routes MUST reject kind-24242 proofs.
### Upload proofs
Exactly one `x` tag over consumed body bytes; temporal check precedes
body consumption.
### Read proofs (the relaxation Will approved)
Host-wide MAY: no `x` required. Exactly one `server` tag matching the
resolved tenant host is a MUST. Optional `x` must match parent hash if
present.
Named residual (verbatim in spec): within at most 60 seconds from
minting (plus 5s future-skew), a captured full header set allows reading
any media blob on exactly one tenant host — read-only,
membership-checked, revocable, not state-changing, not cross-tenant.
### Freshness (Thufir option 2)
- `created_at <= now + 5s` (bounded future skew)
- `now - created_at <= 60s`
- Exactly one `expiration`, valid at admission, satisfying `expiration
<= created_at + 60s`
### Transport/cardinality
Exactly one each of `Authorization` (Nostr scheme), `t`, `expiration`,
`server`; `x` at most once; reject any duplicate, malformed, or
conflicting instance.
### Per-request pairing
Full assertion verification, exact key equality between assertion
`nostr_pubkey` and kind-24242 signer, deny-map enforcement on every
request. Stub gap named.
### Compliance note
PR #7264 implementation is explicitly non-compliant until the bounded
hardening task lands (named gaps: multi-tag acceptance, 3600s window,
optional `server`).
## Behavioral oracle
`FI-TRACE-HTTP-INGRESS` extended to cover kind-24242 admission and
denial cases.
## Scope
Docs-only. No code changes. The code hardening is a separate follow-on
task.
---------
Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: Duncan <dcfd242e557282d7a1e2cf2e6877522682f1e5c6156dc92ca7d90eaedd3b0f95@buzz.block.builderlab.xyz>