Pith Number

pith:QSWJEUWI

pith:2009:QSWJEUWIHXJNJDTPRC66UCQPIQ

not attested not anchored not stored refs pending

Variability in Proto-Planetary Nebulae: I. Light Curve Studies of 12 Carbon-Rich Objects

Bradley D. Spitzbart, Bruce J. Hrivnak, Richard E. Maupin, Wenxian Lu

arxiv:0911.2830 v1 · 2009-11-15 · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QSWJEUWIHXJNJDTPRC66UCQPIQ}

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	2026-05-18T02:34:05.337494Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

84ac9252c83dd2d48e6f88bdea0a0f4414f2ba9819964f7cbb85d676b0d77a68

Aliases

arxiv: 0911.2830 · arxiv_version: 0911.2830v1 · doi: 10.48550/arxiv.0911.2830 · pith_short_12: QSWJEUWIHXJN · pith_short_16: QSWJEUWIHXJNJDTP · pith_short_8: QSWJEUWI

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/QSWJEUWIHXJNJDTPRC66UCQPIQ \
  | 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: 84ac9252c83dd2d48e6f88bdea0a0f4414f2ba9819964f7cbb85d676b0d77a68

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e1a6614193987c4e56a6e2ed1675390c4f553bcda794b26af0ec5952f917d041",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-11-15T03:42:51Z",
    "title_canon_sha256": "92651dc0b9e8099817b314f12373d9b81e693fd6ccaf0ad8a2a24456e6af7770"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0911.2830",
    "kind": "arxiv",
    "version": 1
  }
}