Pith Number

pith:RFNYUJZ7

pith:2000:RFNYUJZ74JEB4QYG2W7UAP7B2E

not attested not anchored not stored refs pending

Blue compact galaxies and the primordial 4Helium abundance

(2) Main Astronomical Observatory, Charlottesville, Kiev, Trinh Xuan Thuan (1), Ukraine), USA, Yuri I. Izotov (2) ((1) University of Virginia

arxiv:astro-ph/0003234 v1 · 2000-03-16 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RFNYUJZ74JEB4QYG2W7UAP7B2E}

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	2026-07-04T14:10:14.618854Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

895b8a273fe2481e4306d5bf403fe1d11d2e478b972c3ec1c2b203aba94d4300

Aliases

arxiv: astro-ph/0003234 · arxiv_version: astro-ph/0003234v1 · doi: 10.48550/arxiv.astro-ph/0003234 · pith_short_12: RFNYUJZ74JEB · pith_short_16: RFNYUJZ74JEB4QYG · pith_short_8: RFNYUJZ7

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/RFNYUJZ74JEB4QYG2W7UAP7B2E \
  | 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: 895b8a273fe2481e4306d5bf403fe1d11d2e478b972c3ec1c2b203aba94d4300

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ca33590b50726f0294c9dd12ed195db6ff08e501c397ae7494bbfa14901a313f",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2000-03-16T11:54:52Z",
    "title_canon_sha256": "00338fdd6a96467f2ee6392eb71b50feb581b30f4122560f75eb4ded144909bc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0003234",
    "kind": "arxiv",
    "version": 1
  }
}