Pith Number

pith:YUC4YLS6

pith:2009:YUC4YLS64QTKPOHE2YYPCCHKZ5

not attested not anchored not stored refs pending

Google distance between words

Alberto J. Evangelista, Bj{\o}rn Kjos-Hanssen

arxiv:0901.4180 v2 · 2009-01-27 · 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{YUC4YLS64QTKPOHE2YYPCCHKZ5}

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	2026-05-18T02:28:32.271929Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c505cc2e5ee426a7b8e4d630f108eacf43b3f66b905b588b600fcdf012ed6c2a

Aliases

arxiv: 0901.4180 · arxiv_version: 0901.4180v2 · doi: 10.48550/arxiv.0901.4180 · pith_short_12: YUC4YLS64QTK · pith_short_16: YUC4YLS64QTKPOHE · pith_short_8: YUC4YLS6

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/YUC4YLS64QTKPOHE2YYPCCHKZ5 \
  | 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: c505cc2e5ee426a7b8e4d630f108eacf43b3f66b905b588b600fcdf012ed6c2a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bc57f46e799ef1937f5e4592fc12f4d0e739cd6a9fb2986b8780f4063e98a9d9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2009-01-27T06:29:10Z",
    "title_canon_sha256": "3a982a037527ea088bfd729a0badf3aa1d825370e906360f034d650227663f8e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.4180",
    "kind": "arxiv",
    "version": 2
  }
}