Pith Number

pith:2UJIYRWQ

pith:2009:2UJIYRWQS3T5MMTELCC2OT5MCX

not attested not anchored not stored refs pending

Chemical Abundances in the Externally Polluted White Dwarf GD 40: Evidence of a Rocky Extrasolar Minor Planet

B. Klein, B. Zuckerman, C. Melis, D. Koester, M. Jura

arxiv:0912.1422 v1 · 2009-12-08 · 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{2UJIYRWQS3T5MMTELCC2OT5MCX}

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	2026-05-18T02:33:57.263959Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d5128c46d096e7d632645885a74fac15e263c253b65c9eadde59ca0a8bb73cb2

Aliases

arxiv: 0912.1422 · arxiv_version: 0912.1422v1 · doi: 10.48550/arxiv.0912.1422 · pith_short_12: 2UJIYRWQS3T5 · pith_short_16: 2UJIYRWQS3T5MMTE · pith_short_8: 2UJIYRWQ

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/2UJIYRWQS3T5MMTELCC2OT5MCX \
  | 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: d5128c46d096e7d632645885a74fac15e263c253b65c9eadde59ca0a8bb73cb2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fe5b920eca0982a54be34a69b7c398d27999252122d040c68655968e1e114f08",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2009-12-08T19:09:40Z",
    "title_canon_sha256": "837f19a46aaac75d82c3a9bb330638f62e8031108531c29ff998d92275ff1227"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.1422",
    "kind": "arxiv",
    "version": 1
  }
}