Pith Number

pith:7QXKL4Q2

pith:2018:7QXKL4Q2UJE4NYRWPZWC5MAVB6

not attested not anchored not stored refs pending

CF4CF: Recommending Collaborative Filtering algorithms using Collaborative Filtering

Andr\'e C.P.L.F. de Carvalho, Carlos Soares, Tiago Cunha

arxiv:1803.02250 v1 · 2018-03-06 · 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{7QXKL4Q2UJE4NYRWPZWC5MAVB6}

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	2026-05-18T00:04:13.200087Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc2ea5f21aa249c6e2367e6c2eb0150f8225b148c13c76095e7ed99226a40dbd

Aliases

arxiv: 1803.02250 · arxiv_version: 1803.02250v1 · doi: 10.48550/arxiv.1803.02250 · pith_short_12: 7QXKL4Q2UJE4 · pith_short_16: 7QXKL4Q2UJE4NYRW · pith_short_8: 7QXKL4Q2

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/7QXKL4Q2UJE4NYRWPZWC5MAVB6 \
  | 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: fc2ea5f21aa249c6e2367e6c2eb0150f8225b148c13c76095e7ed99226a40dbd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "21c7d8281ea5f7bcdf59736b95abac6cc7fe27753b7b0e73177f0b70b053dda5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IR",
    "submitted_at": "2018-03-06T15:23:46Z",
    "title_canon_sha256": "65ff2eceffa80b840f5e29b1ad8766bc1464085950cb489d479e1aea04879f05"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.02250",
    "kind": "arxiv",
    "version": 1
  }
}