Pith Number

pith:WY2XHT7R

pith:2009:WY2XHT7RZ6SKJIP7IJZZUUTDYM

not attested not anchored not stored refs pending

Old Main Sequence Turnoff Photometry in the Small Magellanic Cloud. II. Star Formation History and Its Spatial Gradients

Antonio Aparicio, Carme Gallart, Edgardo Costa, Noelia E. D. Noel, Rene A. Mendez, Sebastian L. Hidalgo

arxiv:0909.2873 v1 · 2009-09-15 · astro-ph.CO · 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{WY2XHT7RZ6SKJIP7IJZZUUTDYM}

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	2026-05-18T02:34:29.943990Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b63573cff1cfa4a4a1ff42739a5263c31a2752f23911766683430921dd3271df

Aliases

arxiv: 0909.2873 · arxiv_version: 0909.2873v1 · doi: 10.48550/arxiv.0909.2873 · pith_short_12: WY2XHT7RZ6SK · pith_short_16: WY2XHT7RZ6SKJIP7 · pith_short_8: WY2XHT7R

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/WY2XHT7RZ6SKJIP7IJZZUUTDYM \
  | 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: b63573cff1cfa4a4a1ff42739a5263c31a2752f23911766683430921dd3271df

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9aab3c5b4d38dcf95d3acc30f642f39de656278419d782a1953bb26131779f87",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-09-15T20:29:37Z",
    "title_canon_sha256": "13cb36a8eef31861f94ffcbcf1e8df56b92529518a159be7c6eec37db2344deb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.2873",
    "kind": "arxiv",
    "version": 1
  }
}