Pith Number

pith:LHGLCW5F

pith:2015:LHGLCW5FGBVIMPHUTZOVUPIGAX

not attested not anchored not stored refs pending

BLC: Private Matrix Factorization Recommenders via Automatic Group Learning

Alessandro Checco, Doug Leith, Giuseppe Bianchi

arxiv:1509.05789 v3 · 2015-09-18 · cs.LG · stat.ML

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{LHGLCW5FGBVIMPHUTZOVUPIGAX}

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	2026-05-18T00:49:52.554194Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

59ccb15ba5306a863cf49e5d5a3d0605e093b7fb0d2b60a7c6f12de89efd5326

Aliases

arxiv: 1509.05789 · arxiv_version: 1509.05789v3 · doi: 10.48550/arxiv.1509.05789 · pith_short_12: LHGLCW5FGBVI · pith_short_16: LHGLCW5FGBVIMPHU · pith_short_8: LHGLCW5F

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/LHGLCW5FGBVIMPHUTZOVUPIGAX \
  | 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: 59ccb15ba5306a863cf49e5d5a3d0605e093b7fb0d2b60a7c6f12de89efd5326

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5fafbde4ca5bf6b05a04a846d2f6626aaff9a5cd84b609df704256c5fa37aa0e",
    "cross_cats_sorted": [
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2015-09-18T20:21:43Z",
    "title_canon_sha256": "fb3f20ad319f474e98cb5e64f6da302508b56d323ea02f3696e0d72190373a98"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1509.05789",
    "kind": "arxiv",
    "version": 3
  }
}