Pith Number

pith:QXNB7BKX

pith:2009:QXNB7BKX7T34N77GPJXH2IDRCK

not attested not anchored not stored refs pending

The ionization fraction gradient across the Horsehead edge: An archetype for molecular clouds

(2) IRAM, (3) LERMA, (4) LAOG, (5) Luth), J. Le Bourlot (5) ((1) Cab-Csic, J. Pety (2), J.R. Goicoechea (1), M. Gerin (3), P. Hily-Blant (4)

arxiv:0902.2748 v1 · 2009-02-16 · 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{QXNB7BKX7T34N77GPJXH2IDRCK}

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	2026-05-18T02:14:47.531899Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

85da1f8557fcf7c6ffe67a6e7d2071129daf337fd74a6386dad6ef306fe24184

Aliases

arxiv: 0902.2748 · arxiv_version: 0902.2748v1 · doi: 10.48550/arxiv.0902.2748 · pith_short_12: QXNB7BKX7T34 · pith_short_16: QXNB7BKX7T34N77G · pith_short_8: QXNB7BKX

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/QXNB7BKX7T34N77GPJXH2IDRCK \
  | 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: 85da1f8557fcf7c6ffe67a6e7d2071129daf337fd74a6386dad6ef306fe24184

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "963b544d7b1864dee721e1be74b15d77ca79be2249c4a96f29e5c9e1412ca1cd",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-02-16T18:33:25Z",
    "title_canon_sha256": "4f133c2bee3c62a9ed38026e1fed73029d8760a6f61547c434601c9527699e49"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.2748",
    "kind": "arxiv",
    "version": 1
  }
}