Pith Number

pith:OVV4Q3X2

pith:2021:OVV4Q3X26I7MHAAJXMMXXDF4KF

not attested not anchored not stored refs pending

Reenvisioning Collaborative Filtering vs Matrix Factorization

Alejandro Bellog\'in, Claudio Pomo, Tommaso Di Noia, Vito Walter Anelli

arxiv:2107.13472 v1 · 2021-07-28 · cs.IR · cs.LG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OVV4Q3X26I7MHAAJXMMXXDF4KF}

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	2026-07-05T03:01:30.408042Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

756bc86efaf23ec38009bb197b8cbc5145aa871349add1d6c544dc326cbc9a8e

Aliases

arxiv: 2107.13472 · arxiv_version: 2107.13472v1 · doi: 10.48550/arxiv.2107.13472 · pith_short_12: OVV4Q3X26I7M · pith_short_16: OVV4Q3X26I7MHAAJ · pith_short_8: OVV4Q3X2

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/OVV4Q3X26I7MHAAJXMMXXDF4KF \
  | 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: 756bc86efaf23ec38009bb197b8cbc5145aa871349add1d6c544dc326cbc9a8e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4346646bc0fe712439808954de3d02cd0f51a34af8a1ebb1e945b59b4f5d5d2b",
    "cross_cats_sorted": [
      "cs.LG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IR",
    "submitted_at": "2021-07-28T16:29:38Z",
    "title_canon_sha256": "981c9f3517cf977cd412276a94ada58f9927bc8b5331c007a023560120a5c362"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2107.13472",
    "kind": "arxiv",
    "version": 1
  }
}