Pith Number

pith:ROWV2SZC

pith:2026:ROWV2SZC2NHU6POMZMP7C7UMK7

not attested not anchored not stored refs pending

When No Answer Is Correct: Diagnosing Absent Answer Detection for MLLMs in Video Understanding

Hai "Helen" Li, Lichen Zhu, Yiheng Wang, Yiran Chen, Yudong Liu, Yueqian Lin

arxiv:2606.08239 v1 · 2026-06-06 · cs.AI · cs.CL · cs.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ROWV2SZC2NHU6POMZMP7C7UMK7}

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	2026-06-09T01:05:31.103958Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8bad5d4b22d34f4f3dcccb1ff17e8c57e1279e23bc228a4eaffc21d997a38e03

Aliases

arxiv: 2606.08239 · arxiv_version: 2606.08239v1 · doi: 10.48550/arxiv.2606.08239 · pith_short_12: ROWV2SZC2NHU · pith_short_16: ROWV2SZC2NHU6POM · pith_short_8: ROWV2SZC

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/ROWV2SZC2NHU6POMZMP7C7UMK7 \
  | 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: 8bad5d4b22d34f4f3dcccb1ff17e8c57e1279e23bc228a4eaffc21d997a38e03

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0c92afa25db7a3b79e9447f95cbd8c3eebb5fce64dd902c34451bb6fd41fcf24",
    "cross_cats_sorted": [
      "cs.CL",
      "cs.CV"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.AI",
    "submitted_at": "2026-06-06T15:51:25Z",
    "title_canon_sha256": "afa2ef128199c3f21536e703ecea9c2ad1ca159d3f5b3a7bdb262c49cd9dc174"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.08239",
    "kind": "arxiv",
    "version": 1
  }
}