Pith Number

pith:HZNIS6XL

pith:2012:HZNIS6XLENKZZPM7FDGZJTKPDF

not attested not anchored not stored refs pending

Spectral variability of FIRST bright QSOs with SDSS observations

2), (2) LBTO, (3) IHELP), Chen Hu (3) ((1) NJNU, China, Li Zhang (1), Richard Green (2), Wei-Hao Bian (1

arxiv:1209.3501 v1 · 2012-09-16 · 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{HZNIS6XLENKZZPM7FDGZJTKPDF}

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	2026-05-18T01:54:27.561054Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3e5a897aeb23559cbd9f28cd94cd4f1962f69dce60fc6b63b80c770370ed7a22

Aliases

arxiv: 1209.3501 · arxiv_version: 1209.3501v1 · doi: 10.48550/arxiv.1209.3501 · pith_short_12: HZNIS6XLENKZ · pith_short_16: HZNIS6XLENKZZPM7 · pith_short_8: HZNIS6XL

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/HZNIS6XLENKZZPM7FDGZJTKPDF \
  | 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: 3e5a897aeb23559cbd9f28cd94cd4f1962f69dce60fc6b63b80c770370ed7a22

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb067d02d60862b64d2334360f9f2bfacf44db277908ee6a0a071c27a819a554",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-09-16T16:26:44Z",
    "title_canon_sha256": "d36284f0725a63e1ee9edafe27981fba47bb736a3cd71c11a024dc6ac3061bd5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1209.3501",
    "kind": "arxiv",
    "version": 1
  }
}