| # Cloudflare Plexi: is an audit retrievable for every WhatsApp key-transparency v2 epoch it claims to have verified? | |
| # Samples 150 epochs uniformly between the namespace's first epoch and last_verified_epoch. Signatures not checked here. | |
| import json, random, urllib.request, collections | |
| get = lambda u: json.load(urllib.request.urlopen(urllib.request.Request(u, headers={"User-Agent": "curl/8.7.1"}), timeout=20)) # default Python UA gets 403 | |
| P = "https://plexi.key-transparency.cloudflare.com/namespaces/whatsapp.key-transparency.v2" | |
| ns = get(P) | |
| first = int(ns["root"].split("/")[0]); last = ns["last_verified_epoch"] | |
| random.seed(20260930) | |
| res = collections.Counter(); bad = [] | |
| for e in sorted(random.sample(range(first, last + 1), 150)): | |
| try: | |
| a = get(f"{P}/audits/{e}") | |
| ok = a.get("epoch") == e and a.get("namespace") == ns["name"] and len(a.get("digest", "")) == 64 | |
| except Exception as x: | |
| ok = False; a = str(x) | |
| res[ok] += 1 | |
| if not ok: bad.append((e, str(a)[:80])) | |
| print(f"epochs {first}..{last}: {dict(res)}"); [print(b) for b in bad] | |