Pith Number

pith:4DXAEPFN

pith:2009:4DXAEPFNWBX7I5VTOT76CRFHOG

not attested not anchored not stored refs pending

The metallicity of the most distant quasars

A. Marconi, E. Oliva, M. Pedani, R. Maiolino, R. Mujica, S. Marinoni, T. Nagao, Y. Juarez

arxiv:0901.0974 v2 · 2009-01-08 · astro-ph.CO · 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{4DXAEPFNWBX7I5VTOT76CRFHOG}

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.

Cited by

1 paper in Pith

Cosmic evolution of the helium and oxygen abundances in type 2 Active Galactic Nuclei: Helium-loud AGNs

Receipt and verification

First computed	2026-07-04T17:14:01.338886Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e0ee023cadb06ff476b374ffe144a771a5c49598e7c501d6bedd17ff1595564e

Aliases

arxiv: 0901.0974 · arxiv_version: 0901.0974v2 · doi: 10.48550/arxiv.0901.0974 · pith_short_12: 4DXAEPFNWBX7 · pith_short_16: 4DXAEPFNWBX7I5VT · pith_short_8: 4DXAEPFN

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/4DXAEPFNWBX7I5VTOT76CRFHOG \
  | 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: e0ee023cadb06ff476b374ffe144a771a5c49598e7c501d6bedd17ff1595564e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "05c6f07c6ef94e7dd1318b55ecba84a2cd261a7fc463df3364521f3b44fe34cc",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-01-08T05:25:39Z",
    "title_canon_sha256": "1e207264ac954e8786d8cecce3d8b76313a1417764a451b7a8813cbde4b8a964"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.0974",
    "kind": "arxiv",
    "version": 2
  }
}