Pith Number

pith:A74GXKXW

pith:2022:A74GXKXW24JLYYXME2X2K55U3X

not attested not anchored not stored refs pending

The Time Domain Spectroscopic Survey: Changing-Look Quasar Candidates from Multi-Epoch Spectroscopy in SDSS-IV

Andrea Merloni, Arnulfo Ramirez, Austin Ahlf, Benjamin R. Roulston, Cayenne Matt, Chelsea L. MacLeod, Daniel Hoover, Dmitry Bizyaev, Donald P. Schneider, Jessie Runnoe, Joel R. Brownstein, John J. Ruan, Kaike Pan, Lina Pulgarin-Duque, Margaret Ridder, Matthew Graham, Michael Eracleous, Paul J. Green, Scott F. Anderson, Sierra A. Dodd, Sonia Joesephine del Casal

arxiv:2201.09123 v2 · 2022-01-22 · astro-ph.GA · 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{A74GXKXW24JLYYXME2X2K55U3X}

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	2026-07-05T04:41:30.971714Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

07f86baaf6d712bc62ec26afa577b4ddc11f02ac40721d0d58f641b60587f712

Aliases

arxiv: 2201.09123 · arxiv_version: 2201.09123v2 · doi: 10.48550/arxiv.2201.09123 · pith_short_12: A74GXKXW24JL · pith_short_16: A74GXKXW24JLYYXM · pith_short_8: A74GXKXW

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/A74GXKXW24JLYYXME2X2K55U3X \
  | 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: 07f86baaf6d712bc62ec26afa577b4ddc11f02ac40721d0d58f641b60587f712

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a52db471c38802ed01403315d634e5a2af98aacf06c2d5b5573d71b075d5f597",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2022-01-22T20:24:08Z",
    "title_canon_sha256": "8f64bd89cf2fc1c17bb629ea56d9e1a3fcb15390317ec431da9d455d45f4def1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2201.09123",
    "kind": "arxiv",
    "version": 2
  }
}