Pith Number

pith:QHJ6WZMQ

pith:2019:QHJ6WZMQGVY3ZFVRQTMZTJYZDA

not attested not anchored not stored refs pending

Learning to Ask Unanswerable Questions for Machine Reading Comprehension

Bing Qin, Furu Wei, Haichao Zhu, Li Dong, Ting Liu, Wenhui Wang

arxiv:1906.06045 v1 · 2019-06-14 · cs.CL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QHJ6WZMQGVY3ZFVRQTMZTJYZDA}

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	2026-05-17T23:43:19.933924Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81d3eb65903571bc96b184d999a719181722d4bc7e8a570d290188b51272dcdb

Aliases

arxiv: 1906.06045 · arxiv_version: 1906.06045v1 · doi: 10.48550/arxiv.1906.06045 · pith_short_12: QHJ6WZMQGVY3 · pith_short_16: QHJ6WZMQGVY3ZFVR · pith_short_8: QHJ6WZMQ

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/QHJ6WZMQGVY3ZFVRQTMZTJYZDA \
  | 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: 81d3eb65903571bc96b184d999a719181722d4bc7e8a570d290188b51272dcdb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0f03edf15d5b616488534f65aa6711fb4bc5717ac28515a22e57f6367e9fd5db",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2019-06-14T06:35:10Z",
    "title_canon_sha256": "7b5204d97537643db9d1c2a5df8474a84bd4d08ca1e5744841dd388710e39429"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1906.06045",
    "kind": "arxiv",
    "version": 1
  }
}