Pith Number

pith:POUU7OU3

pith:2012:POUU7OU3RJLDNUVU6WTZUNO6Y4

not attested not anchored not stored refs pending

A new methodology for constructing a publication-level classification system of science

Ludo Waltman, Nees Jan van Eck

arxiv:1203.0532 v1 · 2012-03-02 · cs.DL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{POUU7OU3RJLDNUVU6WTZUNO6Y4}

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	2026-05-18T04:01:00.443742Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7ba94fba9b8a5636d2b4f5a79a35dec71b770884724b1683ff93c7775fd0a931

Aliases

arxiv: 1203.0532 · arxiv_version: 1203.0532v1 · doi: 10.48550/arxiv.1203.0532 · pith_short_12: POUU7OU3RJLD · pith_short_16: POUU7OU3RJLDNUVU · pith_short_8: POUU7OU3

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/POUU7OU3RJLDNUVU6WTZUNO6Y4 \
  | 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: 7ba94fba9b8a5636d2b4f5a79a35dec71b770884724b1683ff93c7775fd0a931

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a907de38f762f9973c82f0cfef119e0b5492068f11c8f5a098b927645ba49e86",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DL",
    "submitted_at": "2012-03-02T17:45:42Z",
    "title_canon_sha256": "858a6de89a6528f337d77930ab763befb58734f23b5a827f58b5631ca8fa0b7c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.0532",
    "kind": "arxiv",
    "version": 1
  }
}