Pith Number

pith:54YKBCAK

pith:2009:54YKBCAKOQL32WQPSNJ4VOW2DA

not attested not anchored not stored refs pending

Central mass-to-light ratios and dark matter fractions in early-type galaxies

A.J. Romanowsky, C. Tortora, G. Covone, M. Capaccioli, N.R. Napolitano

arxiv:0901.3781 v2 · 2009-01-23 · 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{54YKBCAKOQL32WQPSNJ4VOW2DA}

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	2026-05-18T02:14:56.068504Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ef30a0880a7417bd5a0f9353cabada181b8bac0c25030d3b1f2c984aa11ea269

Aliases

arxiv: 0901.3781 · arxiv_version: 0901.3781v2 · doi: 10.48550/arxiv.0901.3781 · pith_short_12: 54YKBCAKOQL3 · pith_short_16: 54YKBCAKOQL32WQP · pith_short_8: 54YKBCAK

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/54YKBCAKOQL32WQPSNJ4VOW2DA \
  | 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: ef30a0880a7417bd5a0f9353cabada181b8bac0c25030d3b1f2c984aa11ea269

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cd1a6bd425661d1fb08430786c7ed433fad751be1ff9da864aa10729a66e7f44",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-01-23T21:02:23Z",
    "title_canon_sha256": "d1ad90603b694a242600111593345667acf3052a5e01c564c50f9317dc8f95a3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.3781",
    "kind": "arxiv",
    "version": 2
  }
}