Pith Number

pith:VNMF227S

pith:2026:VNMF227SBVLGACUY7WCAQORDQW

not attested not anchored not stored refs pending

Is a Document Educational or Just Wikipedia-Style? -- Pitfalls of Classifier-Based Quality Filtering

Mateusz Klimaszewski, Piotr Andruszkiewicz

arxiv:2605.23721 v1 · 2026-05-21 · 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{VNMF227SBVLGACUY7WCAQORDQW}

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	2026-05-25T02:02:28.414923Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ab585d6bf20d56600a98fd84083a23858d3b84b7d55e746ee36c384b4d3aa9cf

Aliases

arxiv: 2605.23721 · arxiv_version: 2605.23721v1 · doi: 10.48550/arxiv.2605.23721 · pith_short_12: VNMF227SBVLG · pith_short_16: VNMF227SBVLGACUY · pith_short_8: VNMF227S

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/VNMF227SBVLGACUY7WCAQORDQW \
  | 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: ab585d6bf20d56600a98fd84083a23858d3b84b7d55e746ee36c384b4d3aa9cf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ebd3c56e2397d37742d6f43511ff4cab21114c1679c1ff00fddd7269b172118a",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2026-05-21T08:59:11Z",
    "title_canon_sha256": "39fefcedcd2fff75ba1c8f1d0d7a47228b3bcc49ff23c502e34431ea8db92ac5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.23721",
    "kind": "arxiv",
    "version": 1
  }
}