Pith Number

pith:X6YYQBZG

pith:2015:X6YYQBZGLEOKUWGPI4MWFDMFCN

not attested not anchored not stored refs pending

Image patch analysis of sunspots and active regions. II. Clustering via matrix factorization

Alfred O. Hero III, Fraser Watson, Jimmy J. Li, Kevin R. Moon, Ruben de Visscher, Veronique Delouille

arxiv:1504.02762 v2 · 2015-04-10 · astro-ph.SR · cs.CV

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{X6YYQBZGLEOKUWGPI4MWFDMFCN}

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	2026-05-18T01:19:19.236662Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bfb1880726591caa58cf4719628d85134b580064888baa04fe3e9003390f3fcd

Aliases

arxiv: 1504.02762 · arxiv_version: 1504.02762v2 · doi: 10.48550/arxiv.1504.02762 · pith_short_12: X6YYQBZGLEOK · pith_short_16: X6YYQBZGLEOKUWGP · pith_short_8: X6YYQBZG

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/X6YYQBZGLEOKUWGPI4MWFDMFCN \
  | 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: bfb1880726591caa58cf4719628d85134b580064888baa04fe3e9003390f3fcd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "02b54d7eeeea26148d073e6fe9c3b7554a611db99c07ac2460055734353fbe6f",
    "cross_cats_sorted": [
      "cs.CV"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2015-04-10T19:03:26Z",
    "title_canon_sha256": "e836b7424502bdd248b92b9577838184005266aa7d1d913a914f2d2b633c5c8d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.02762",
    "kind": "arxiv",
    "version": 2
  }
}