Pith Number

pith:CQRLRHKK

pith:1999:CQRLRHKKR32G4U3TBJXCIB4FNG

not attested not anchored not stored refs pending

Ionization Corrections For Low-Metallicity H II Regions and the Primordial Helium Abundance

G. Steigman, R. Gruenwald, S. M. Viegas

arxiv:astro-ph/9909213 v2 · 1999-09-13 · 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{CQRLRHKKR32G4U3TBJXCIB4FNG}

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	2026-05-18T01:40:12.690176Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1422b89d4a8ef46e53730a6e240785698d2811cdc6ea09eb4157bd48b3c35593

Aliases

arxiv: astro-ph/9909213 · arxiv_version: astro-ph/9909213v2 · doi: 10.48550/arxiv.astro-ph/9909213 · pith_short_12: CQRLRHKKR32G · pith_short_16: CQRLRHKKR32G4U3T · pith_short_8: CQRLRHKK

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/CQRLRHKKR32G4U3TBJXCIB4FNG \
  | 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: 1422b89d4a8ef46e53730a6e240785698d2811cdc6ea09eb4157bd48b3c35593

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e26d89c505b8f1caea9768eeb584b806e084686b43327522c9b427ecefd90739",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-09-13T19:38:30Z",
    "title_canon_sha256": "520197b4882ca8de4f9eebd6eae3353deac3742b203a408946100cba88ea41d1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9909213",
    "kind": "arxiv",
    "version": 2
  }
}