Pith Number

pith:4ZFTIGR3

pith:2009:4ZFTIGR3Y64QJRMGNBIXPIKN4C

not attested not anchored not stored refs pending

Estimating the H I gas fractions of galaxies in the local Universe

Barbara Catinella, Cheng Li, Guinevere Kauffmann, Hu Zou, Qi Guo, Ruixiang Chang, Shiyin Shen, Wei Zhang

arxiv:0902.2392 v3 · 2009-02-13 · astro-ph.GA · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4ZFTIGR3Y64QJRMGNBIXPIKN4C}

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	2026-05-18T02:14:47.888688Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e64b341a3bc7b904c586685177a14de086d4e6b5d0d8cbb133bf6b0e76bab412

Aliases

arxiv: 0902.2392 · arxiv_version: 0902.2392v3 · doi: 10.48550/arxiv.0902.2392 · pith_short_12: 4ZFTIGR3Y64Q · pith_short_16: 4ZFTIGR3Y64QJRMG · pith_short_8: 4ZFTIGR3

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/4ZFTIGR3Y64QJRMGNBIXPIKN4C \
  | 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: e64b341a3bc7b904c586685177a14de086d4e6b5d0d8cbb133bf6b0e76bab412

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2e38899c9b2e6ed710a61612584ca2045adc82bbee192332c2ede979f1713831",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-02-13T21:00:22Z",
    "title_canon_sha256": "ad3c4fe2cd8b789c209c623f9b525e7b15e5fbdf81654b82e562b19220ac528b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.2392",
    "kind": "arxiv",
    "version": 3
  }
}