Pith Number

pith:ZG4CU4AG

pith:2009:ZG4CU4AGDWK7ODPHYSBHI5YOQF

not attested not anchored not stored refs pending

Protoplanetary gas disks in the far infrared

Bruce Swinyard, Javier R. Goicoechea

arxiv:0909.3280 v1 · 2009-09-17 · astro-ph.GA · astro-ph.EP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZG4CU4AGDWK7ODPHYSBHI5YOQF}

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	2026-05-18T02:11:46.744955Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c9b82a70061d95f70de7c48274770e816fdb12894962a3093759d864403a225b

Aliases

arxiv: 0909.3280 · arxiv_version: 0909.3280v1 · doi: 10.48550/arxiv.0909.3280 · pith_short_12: ZG4CU4AGDWK7 · pith_short_16: ZG4CU4AGDWK7ODPH · pith_short_8: ZG4CU4AG

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/ZG4CU4AGDWK7ODPHYSBHI5YOQF \
  | 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: c9b82a70061d95f70de7c48274770e816fdb12894962a3093759d864403a225b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3f9f987f245e1e72aa83483cb7442e86b8a27f3191e9a750d6a3cefd2c5617d8",
    "cross_cats_sorted": [
      "astro-ph.EP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-09-17T17:30:01Z",
    "title_canon_sha256": "97e427965388204947a7804074fc50c833b9c340449ad22c0b96131d137aab31"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.3280",
    "kind": "arxiv",
    "version": 1
  }
}