Pith Number

pith:JK74FPTA

pith:2015:JK74FPTAX62GHDVOYPMWDZI53U

not attested not anchored not stored refs pending

Quasar Classification Using Color and Variability

(2) University of Wyoming, (3) Princeton University, (4) University of California, (5) University of Washington, (6) The University of Edinburgh, (7) Skytree, Adam D. Myers (2), Chelsea L. MacLeod (6), Christina M. Peters (1), Gordon T. Richards (1), Inc.), Kasper B. Schmidt (4), Michael A. Strauss (3), Nicholas P. Ross (6), Ryan Riegel (7) ((1) Drexel University, Santa Barbara, \v{Z}eljko Ivezi\'c (5)

arxiv:1508.04121 v1 · 2015-08-17 · 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{JK74FPTAX62GHDVOYPMWDZI53U}

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	2026-05-18T01:09:46.040954Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4abfc2be60bfb4638eaec3d961e51ddd0040f69a06a9ed7cb811c87979a48894

Aliases

arxiv: 1508.04121 · arxiv_version: 1508.04121v1 · doi: 10.48550/arxiv.1508.04121 · pith_short_12: JK74FPTAX62G · pith_short_16: JK74FPTAX62GHDVO · pith_short_8: JK74FPTA

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/JK74FPTAX62GHDVOYPMWDZI53U \
  | 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: 4abfc2be60bfb4638eaec3d961e51ddd0040f69a06a9ed7cb811c87979a48894

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0e6910c05bb3303736c97ef8c6f7200f89559af9186ac5c0ad9a05ddeabb2bc0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2015-08-17T19:37:46Z",
    "title_canon_sha256": "738044007e32bef6cb963e42e9f5ed930c1bec92949c84727d6f4041e3053fe0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1508.04121",
    "kind": "arxiv",
    "version": 1
  }
}