Pith Number

pith:M2Y5JRNS

pith:2011:M2Y5JRNSEAHY2BM4SQUG6OUYNN

not attested not anchored not stored refs pending

Adaptive Thresholding for Sparse Covariance Matrix Estimation

Tony Cai, Weidong Liu

arxiv:1102.2237 v1 · 2011-02-10 · stat.ME

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{M2Y5JRNSEAHY2BM4SQUG6OUYNN}

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	2026-05-18T04:28:56.450256Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

66b1d4c5b2200f8d059c94286f3a986b7f032c083de250f7545857e0e85e568e

Aliases

arxiv: 1102.2237 · arxiv_version: 1102.2237v1 · doi: 10.48550/arxiv.1102.2237 · pith_short_12: M2Y5JRNSEAHY · pith_short_16: M2Y5JRNSEAHY2BM4 · pith_short_8: M2Y5JRNS

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/M2Y5JRNSEAHY2BM4SQUG6OUYNN \
  | 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: 66b1d4c5b2200f8d059c94286f3a986b7f032c083de250f7545857e0e85e568e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "11c5e7a052b026a57e698f7ca43f4fcdedf75eb67e46534a9f7650f3ece539c9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2011-02-10T21:11:01Z",
    "title_canon_sha256": "3d6b82873774df6e3b2990d78a03fa3113009bb00dfae61eebe570a5c6d47dd3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1102.2237",
    "kind": "arxiv",
    "version": 1
  }
}