Pith Number

pith:3ZXQ2QKY

pith:2013:3ZXQ2QKYXTM5NMCYQLKWOJXF4Y

not attested not anchored not stored refs pending

OptShrink: An algorithm for improved low-rank signal matrix denoising by optimal, data-driven singular value shrinkage

Raj Rao Nadakuditi

arxiv:1306.6042 v4 · 2013-06-25 · math.ST · cs.IT · math.IT · stat.ML · stat.TH

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{3ZXQ2QKYXTM5NMCYQLKWOJXF4Y}

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	2026-05-18T02:53:56.343816Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

de6f0d4158bcd9d6b05882d56726e5e61a7b638a3c5396778e7b5ee5a3daa6c6

Aliases

arxiv: 1306.6042 · arxiv_version: 1306.6042v4 · doi: 10.48550/arxiv.1306.6042 · pith_short_12: 3ZXQ2QKYXTM5 · pith_short_16: 3ZXQ2QKYXTM5NMCY · pith_short_8: 3ZXQ2QKY

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/3ZXQ2QKYXTM5NMCYQLKWOJXF4Y \
  | 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: de6f0d4158bcd9d6b05882d56726e5e61a7b638a3c5396778e7b5ee5a3daa6c6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1587f65317bec23c6138f361f069e1a2ed1a5b8ddb986020d5e88a2d4fef1b4f",
    "cross_cats_sorted": [
      "cs.IT",
      "math.IT",
      "stat.ML",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2013-06-25T17:39:48Z",
    "title_canon_sha256": "380001edac0d9ebfbfccccc88bf011cd21b97cdcedde45717b43aa41bc0fa87c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1306.6042",
    "kind": "arxiv",
    "version": 4
  }
}