Pith Number

pith:4SCVEU45

pith:2012:4SCVEU45T23G7VRBEVSHM62F7P

not attested not anchored not stored refs pending

Automated unsupervised classification of the Sloan Digital Sky Survey stellar spectra using k-means clustering

2), 2) ((1) Instituto de Astrofisica de Canarias, (2) Departamento de Astrofisica, C. Allende Prieto (1, J. Sanchez Almeida (1, La Laguna, Spain, Spain), Tenerife, Universidad de La Laguna

arxiv:1211.5321 v1 · 2012-11-22 · astro-ph.SR · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4SCVEU45T23G7VRBEVSHM62F7P}

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	2026-05-18T01:53:01.476871Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e48552539d9eb66fd6212564767b45fbd47051dbe7dc92c2b5edc2bc095eb9ab

Aliases

arxiv: 1211.5321 · arxiv_version: 1211.5321v1 · doi: 10.48550/arxiv.1211.5321 · pith_short_12: 4SCVEU45T23G · pith_short_16: 4SCVEU45T23G7VRB · pith_short_8: 4SCVEU45

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/4SCVEU45T23G7VRBEVSHM62F7P \
  | 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: e48552539d9eb66fd6212564767b45fbd47051dbe7dc92c2b5edc2bc095eb9ab

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b290d6d883406193b9039ef39a4501796e84d5a84ebbdc417738b2c29e0ee545",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2012-11-22T16:01:37Z",
    "title_canon_sha256": "20e4969e78b7a44ec88d17ca65cd9fe24f59327525f16bf622e58fdd330bbf33"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1211.5321",
    "kind": "arxiv",
    "version": 1
  }
}