Pith Number

pith:5NH6PI6V

pith:2018:5NH6PI6V4YHIQKUDYU4KSFLRGC

not attested not anchored not stored refs pending

The Evolution of Chemical Abundance in Quasar Broad Line Region

Fei Xu, Fuyan Bian, Wenwen Zuo, Xiaohui Fan, Yue Shen, Zonghong Zhu

arxiv:1807.01978 v2 · 2018-07-05 · 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{5NH6PI6V4YHIQKUDYU4KSFLRGC}

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	2026-05-18T00:10:36.769086Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

eb4fe7a3d5e60e882a83c538a9157130a7b724fa796b9592a36c2bffe6a67006

Aliases

arxiv: 1807.01978 · arxiv_version: 1807.01978v2 · doi: 10.48550/arxiv.1807.01978 · pith_short_12: 5NH6PI6V4YHI · pith_short_16: 5NH6PI6V4YHIQKUD · pith_short_8: 5NH6PI6V

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/5NH6PI6V4YHIQKUDYU4KSFLRGC \
  | 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: eb4fe7a3d5e60e882a83c538a9157130a7b724fa796b9592a36c2bffe6a67006

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f8b3fbd60c57da919a99f2761d0f58923d721d64308d2e3f4e34415125bccede",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-07-05T12:58:41Z",
    "title_canon_sha256": "25e1998e8d0b1e1a1631b919374c0056dcab22763b89393b1298b0e396ed0330"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.01978",
    "kind": "arxiv",
    "version": 2
  }
}