Pith Number

pith:FK4HWPCU

pith:2018:FK4HWPCUZFNSG62NUBCV6WPD2B

not attested not anchored not stored refs pending

QDEE: Question Difficulty and Expertise Estimation in Community Question Answering Sites

Jiankai Sun, Rajiv Ramnath, Sobhan Moosavi, Srinivasan Parthasarathy

arxiv:1804.00109 v2 · 2018-03-31 · cs.SI · 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{FK4HWPCUZFNSG62NUBCV6WPD2B}

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	2026-05-18T00:17:53.158063Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2ab87b3c54c95b237b4da0455f59e3d0587cbe90a84453c56da49c6b8b2853cb

Aliases

arxiv: 1804.00109 · arxiv_version: 1804.00109v2 · doi: 10.48550/arxiv.1804.00109 · pith_short_12: FK4HWPCUZFNS · pith_short_16: FK4HWPCUZFNSG62N · pith_short_8: FK4HWPCU

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/FK4HWPCUZFNSG62NUBCV6WPD2B \
  | 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: 2ab87b3c54c95b237b4da0455f59e3d0587cbe90a84453c56da49c6b8b2853cb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6543e35c344978ff6b2a73132441318998dda04a5405826659ec96bce6caf00b",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.SI",
    "submitted_at": "2018-03-31T02:56:19Z",
    "title_canon_sha256": "ca23c0a27a1da539424bf852d389d9c0c6edc4888c06936dfff24895a602a21a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.00109",
    "kind": "arxiv",
    "version": 2
  }
}