Pith Number

pith:DR5A4AT2

pith:2009:DR5A4AT22B7PJNOD2M2KVCK3NF

not attested not anchored not stored refs pending

PHL 932: when is a planetary nebula not a planetary nebula?

David J. Frew, Greg J. Madsen, Quentin A. Parker, Simon J. O'Toole

arxiv:0910.2078 v1 · 2009-10-12 · 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{DR5A4AT22B7PJNOD2M2KVCK3NF}

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	2026-05-18T02:11:24.703226Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1c7a0e027ad07ef4b5c3d334aa895b6942ac7b6783ff5688ba774a8b3652ef03

Aliases

arxiv: 0910.2078 · arxiv_version: 0910.2078v1 · doi: 10.48550/arxiv.0910.2078 · pith_short_12: DR5A4AT22B7P · pith_short_16: DR5A4AT22B7PJNOD · pith_short_8: DR5A4AT2

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/DR5A4AT22B7PJNOD2M2KVCK3NF \
  | 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: 1c7a0e027ad07ef4b5c3d334aa895b6942ac7b6783ff5688ba774a8b3652ef03

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7a05fae0b440c74d98bbdc3e3bf72478065ceaf1de6aeb831943cea0fa1897f0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-10-12T04:16:53Z",
    "title_canon_sha256": "6aa79b10d76de76418e354ba485cf1ca87012577dffe9066866fabd8b2af29a8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.2078",
    "kind": "arxiv",
    "version": 1
  }
}