Pith Number

pith:SB4OJHZN

pith:2026:SB4OJHZNRCFRGUHO45KXE5RLSE

not attested not anchored not stored refs pending

KBF: Knowledge Boundary as Fingerprint for Language Model and Black-Box API Auditing

Bingyu Li, Mingxun Zhou, Yijia Fang, Yiqing Feng

arxiv:2605.29524 v1 · 2026-05-28 · cs.CR · cs.AI

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SB4OJHZNRCFRGUHO45KXE5RLSE}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-29T01:05:44.997604Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9078e49f2d888b1350eee75572762b912957af17765733a0f63d75ee19fd3393

Aliases

arxiv: 2605.29524 · arxiv_version: 2605.29524v1 · doi: 10.48550/arxiv.2605.29524 · pith_short_12: SB4OJHZNRCFR · pith_short_16: SB4OJHZNRCFRGUHO · pith_short_8: SB4OJHZN

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/SB4OJHZNRCFRGUHO45KXE5RLSE \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 9078e49f2d888b1350eee75572762b912957af17765733a0f63d75ee19fd3393

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4e13d411d312e91641b98f36c63523dfa66ac95107b58e9a809a3ef5d714c1e2",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2026-05-28T07:40:24Z",
    "title_canon_sha256": "ce4a8f86bcf070fc82bcef38e9c6a32cff90f46e8731e84b394d79f24b178326"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.29524",
    "kind": "arxiv",
    "version": 1
  }
}