Pith Number

pith:WDSF45ET

pith:2020:WDSF45ETFH7SXUFTBBKFX5OCX7

not attested not anchored not stored refs pending

Characterization of Optical Light Curves of Extreme Variability Quasars Over a ~16-yr Baseline

Qian Yang, Yuanze Luo, Yue Shen

arxiv:2004.04774 v1 · 2020-04-09 · 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{WDSF45ETFH7SXUFTBBKFX5OCX7}

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	2026-07-05T00:54:34.373482Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b0e45e749329ff2bd0b308545bf5c2bfd96d9eed99ce3c20153c1168e0c1309a

Aliases

arxiv: 2004.04774 · arxiv_version: 2004.04774v1 · doi: 10.48550/arxiv.2004.04774 · pith_short_12: WDSF45ETFH7S · pith_short_16: WDSF45ETFH7SXUFT · pith_short_8: WDSF45ET

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/WDSF45ETFH7SXUFTBBKFX5OCX7 \
  | 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: b0e45e749329ff2bd0b308545bf5c2bfd96d9eed99ce3c20153c1168e0c1309a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bc4935747d79fcbf88322ed56a97bb1a8d795ac71eb1268a8a56c0b1c92b64fb",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2020-04-09T19:02:57Z",
    "title_canon_sha256": "57b3daca7f9a89fd1602eefe83f8c954c583c0f172eca509dd898774e56e5f3c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2004.04774",
    "kind": "arxiv",
    "version": 1
  }
}