Pith Number

pith:2JY573EU

pith:2009:2JY573EU3D2CE75XPX6R7G3LZO

not attested not anchored not stored refs pending

The OPTX Project III: X-ray versus Optical Spectral Type for AGNs

2, (2) Department of Physics, 3), (3) Institute for Astronomy, (4) University of Illinois, (5) NASA GSFC), A. J. Barger (1, Astronomy, L. L. Cowie (3), L. Trouille (1), R. F. Mushotzky (5) ((1) University of Wisconsin-Madison, University of Hawaii, Y. Yang (4)

arxiv:0908.0002 v1 · 2009-07-31 · 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{2JY573EU3D2CE75XPX6R7G3LZO}

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	2026-05-18T02:12:45.609166Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d271dfec94d8f4227fb77dfd1f9b6bcb817f153e7942efeaf372cf74b3075693

Aliases

arxiv: 0908.0002 · arxiv_version: 0908.0002v1 · doi: 10.48550/arxiv.0908.0002 · pith_short_12: 2JY573EU3D2C · pith_short_16: 2JY573EU3D2CE75X · pith_short_8: 2JY573EU

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/2JY573EU3D2CE75XPX6R7G3LZO \
  | 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: d271dfec94d8f4227fb77dfd1f9b6bcb817f153e7942efeaf372cf74b3075693

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3d183c3deab2a2f4893201ed3b23d78bd234c7d4281f0afca63e6926abecfaa0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-07-31T20:03:42Z",
    "title_canon_sha256": "5e1926160729baa075f56ddc285904b9e7dd3ab27550447393aee06aad0e00bd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0908.0002",
    "kind": "arxiv",
    "version": 1
  }
}