Pith Number

pith:7DXS4A4B

pith:2026:7DXS4A4BVNR47SMLVHQWDW4TZB

not attested not anchored not stored refs pending

Combinatorial Sparse PCA Beyond the Spiked Identity Model

Kevin Tian, Peiyuan Zhang, Purnamrita Sarkar, Syamantak Kumar

arxiv:2603.02607 v2 · 2026-03-03 · stat.ML · cs.DS · cs.LG · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7DXS4A4BVNR47SMLVHQWDW4TZB}

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	2026-06-23T00:11:49.134445Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f8ef2e0381ab63cfc98ba9e161db93c87c4f7ad313521832d6a866f1582d1c0a

Aliases

arxiv: 2603.02607 · arxiv_version: 2603.02607v2 · doi: 10.48550/arxiv.2603.02607 · pith_short_12: 7DXS4A4BVNR4 · pith_short_16: 7DXS4A4BVNR47SML · pith_short_8: 7DXS4A4B

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/7DXS4A4BVNR47SMLVHQWDW4TZB \
  | 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: f8ef2e0381ab63cfc98ba9e161db93c87c4f7ad313521832d6a866f1582d1c0a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5e60cdd6f8560a1906576d310d993ef2a55057695aa72530bba8a2ef86558c9b",
    "cross_cats_sorted": [
      "cs.DS",
      "cs.LG",
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ML",
    "submitted_at": "2026-03-03T05:19:55Z",
    "title_canon_sha256": "5fdf4ca844c77a6d6926a4848d53eda6aa73e06b3151735282880da855e6b699"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2603.02607",
    "kind": "arxiv",
    "version": 2
  }
}