Pith Number

pith:YZL5QWIP

pith:2004:YZL5QWIPS3KWP5LL5R6IBQ42L7

not attested not anchored not stored refs pending

Average UV Quasar Spectra in the Context of Eigenvector 1: A Baldwin Effect Governed by Eddington Ratio?

D. Dultzin-Hacyan, J. W. Sulentic, M. Calvani, P. Marziani, R. Bachev, R. Zamanov

arxiv:astro-ph/0408334 v1 · 2004-08-18 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YZL5QWIPS3KWP5LL5R6IBQ42L7}

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	2026-07-04T16:44:30.785297Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c657d8590f96d567f56bec7c80c39a5ffc916c26fa5f824f2826d0f1c664a098

Aliases

arxiv: astro-ph/0408334 · arxiv_version: astro-ph/0408334v1 · doi: 10.48550/arxiv.astro-ph/0408334 · pith_short_12: YZL5QWIPS3KW · pith_short_16: YZL5QWIPS3KWP5LL · pith_short_8: YZL5QWIP

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/YZL5QWIPS3KWP5LL5R6IBQ42L7 \
  | 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: c657d8590f96d567f56bec7c80c39a5ffc916c26fa5f824f2826d0f1c664a098

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b6c07705372f1aefd5baca6b1116e00f1daa283f170f017745a895f2b54a2a49",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-08-18T16:58:51Z",
    "title_canon_sha256": "661cccfaab4b6c4809f3b9e715bb90924cc73763b640533a46492573a347b94c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0408334",
    "kind": "arxiv",
    "version": 1
  }
}