Pith Number

pith:J77RQZ5V

pith:2007:J77RQZ5VXTO5WT7JMYX2IWPSUR

not attested not anchored not stored refs pending

The Opacity of Spiral Galaxy Disks VIII: Structure of the Cold ISM

B. Buckalew, B. Draine, B. W. Holwerda, D. Calzetti, K.D. Gordon, M. Thornley, P. C. van der Kruit, R. A. Gonzalez, Ronald J. Allen

arxiv:0707.4165 v1 · 2007-07-27 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{J77RQZ5VXTO5WT7JMYX2IWPSUR}

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	2026-07-04T15:24:31.127853Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4fff1867b5bcdddb4fe9662fa459f2a440565d07782d8c19ef54b7f065805192

Aliases

arxiv: 0707.4165 · arxiv_version: 0707.4165v1 · doi: 10.48550/arxiv.0707.4165 · pith_short_12: J77RQZ5VXTO5 · pith_short_16: J77RQZ5VXTO5WT7J · pith_short_8: J77RQZ5V

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/J77RQZ5VXTO5WT7JMYX2IWPSUR \
  | 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: 4fff1867b5bcdddb4fe9662fa459f2a440565d07782d8c19ef54b7f065805192

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c29944350d574c4ac463fa9c0954cb976461eae7293701d56a242b86cb004ea4",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2007-07-27T19:29:27Z",
    "title_canon_sha256": "0d9b4d8d6a303bfc174d80214d69857ddc7d03739efdabc92ae8138246fee361"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0707.4165",
    "kind": "arxiv",
    "version": 1
  }
}