Pith Number

pith:5F4ZECWD

pith:2010:5F4ZECWDTDVH543JREFNZGKZIJ

not attested not anchored not stored refs pending

Optical Microvariability in Quasars: Spectral Variability

A. Ramirez, D. Dultzin, J. A. de Diego (Instituto de Astronom\'ia, UNAM)

arxiv:1004.1199 v1 · 2010-04-07 · 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{5F4ZECWDTDVH543JREFNZGKZIJ}

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	2026-05-18T02:08:08.187602Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e979920ac398ea7ef369890adc9959424caf59d2e577bcbeb73733f5666d13da

Aliases

arxiv: 1004.1199 · arxiv_version: 1004.1199v1 · doi: 10.48550/arxiv.1004.1199 · pith_short_12: 5F4ZECWDTDVH · pith_short_16: 5F4ZECWDTDVH543J · pith_short_8: 5F4ZECWD

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/5F4ZECWDTDVH543JREFNZGKZIJ \
  | 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: e979920ac398ea7ef369890adc9959424caf59d2e577bcbeb73733f5666d13da

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4e896ae4fa7d795a6456c89d5ab9053df8ac4e42aa03938a2f7da58d17a5cd18",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2010-04-07T22:13:08Z",
    "title_canon_sha256": "7529331c84fa51548f2509e5882feccaf9e709289c210407e855a19e2496f2f7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1004.1199",
    "kind": "arxiv",
    "version": 1
  }
}