Pith Number

pith:5UWAXR2K

pith:2010:5UWAXR2KG2LX4WFSMNHWSNCM7W

not attested not anchored not stored refs pending

Efficient and Effective Spam Filtering and Re-ranking for Large Web Datasets

Charles L. A. Clarke, Gordon V. Cormack, Mark D. Smucker

arxiv:1004.5168 v1 · 2010-04-29 · cs.IR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5UWAXR2KG2LX4WFSMNHWSNCM7W}

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	2026-05-18T02:24:15.192181Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ed2c0bc74a36977e58b2634f69344cfd9e7bb67c4649552dc5375a53c0024e45

Aliases

arxiv: 1004.5168 · arxiv_version: 1004.5168v1 · doi: 10.48550/arxiv.1004.5168 · pith_short_12: 5UWAXR2KG2LX · pith_short_16: 5UWAXR2KG2LX4WFS · pith_short_8: 5UWAXR2K

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/5UWAXR2KG2LX4WFSMNHWSNCM7W \
  | 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: ed2c0bc74a36977e58b2634f69344cfd9e7bb67c4649552dc5375a53c0024e45

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bd9c5e3ea3da43ac96efea70b1edc7bfd1e0e8650cf922d726cf994fa587960c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IR",
    "submitted_at": "2010-04-29T00:54:25Z",
    "title_canon_sha256": "67eff3629617ee0821761d375f1fe05ffb9665a85cdbc378ca1d18612c045615"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1004.5168",
    "kind": "arxiv",
    "version": 1
  }
}