Pith Number

pith:EQ4QPYZE

pith:2009:EQ4QPYZEUGVQTWODQLADYJXYK5

not attested not anchored not stored refs pending

Accurate parameter estimation for star formation history in galaxies using SDSS spectra

Ann B. Lee, Chad M. Schafer (Department of Statistics, CMU), Joseph W. Richards, Peter E. Freeman

arxiv:0905.4683 v1 · 2009-05-28 · astro-ph.CO · astro-ph.IM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EQ4QPYZEUGVQTWODQLADYJXYK5}

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	2026-05-18T02:13:31.078184Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

243907e324a1ab09d9c382c03c26f8577add5529a4e8441382367e795126b026

Aliases

arxiv: 0905.4683 · arxiv_version: 0905.4683v1 · doi: 10.48550/arxiv.0905.4683 · pith_short_12: EQ4QPYZEUGVQ · pith_short_16: EQ4QPYZEUGVQTWOD · pith_short_8: EQ4QPYZE

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/EQ4QPYZEUGVQTWODQLADYJXYK5 \
  | 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: 243907e324a1ab09d9c382c03c26f8577add5529a4e8441382367e795126b026

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "da6d5abe6c90f809073b8e931546c59c9580b9062e53ffe3ca254638ceb64062",
    "cross_cats_sorted": [
      "astro-ph.IM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-05-28T15:45:54Z",
    "title_canon_sha256": "0ea973ea19d4d1b998466ed13fd318c5b6af5374d2dadcd2699cdedc787ee185"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.4683",
    "kind": "arxiv",
    "version": 1
  }
}