Pith Number

pith:AQM4ML6A

pith:2012:AQM4ML6A2HCGT67GWUUQE7M6X2

not attested not anchored not stored refs pending

Selecting Quasar Candidates by a SVM Classification System

Nanbo Peng, Xuebing Wu, Yanxia Zhang, Yongheng Zhao

arxiv:1204.6354 v1 · 2012-04-28 · astro-ph.IM · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{AQM4ML6A2HCGT67GWUUQE7M6X2}

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	2026-05-18T01:57:42.913279Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0419c62fc0d1c469fbe6b529027d9ebeb4c91567c73e06b84c5779589015bb1a

Aliases

arxiv: 1204.6354 · arxiv_version: 1204.6354v1 · doi: 10.48550/arxiv.1204.6354 · pith_short_12: AQM4ML6A2HCG · pith_short_16: AQM4ML6A2HCGT67G · pith_short_8: AQM4ML6A

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/AQM4ML6A2HCGT67GWUUQE7M6X2 \
  | 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: 0419c62fc0d1c469fbe6b529027d9ebeb4c91567c73e06b84c5779589015bb1a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b1ea6eba4cec991ba5e4d15b79c67605ff175c1ac12909f4b87302950c6aac07",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2012-04-28T00:44:00Z",
    "title_canon_sha256": "dc777e808b136476c5467c785e4ec06ec142535aabb17b4dfa5679c3566aa2af"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1204.6354",
    "kind": "arxiv",
    "version": 1
  }
}