Pith Number

pith:4SNU2C6A

pith:2009:4SNU2C6AOG3UQUYXMHINRTQDQ5

not attested not anchored not stored refs pending

Measurements of 4He in Metal-Poor Extragalactic HII Regions: the Primordial Helium Abundance and the Delta Y / Delta O Ratio

A. Peimbert, L. Carigi, M. Peimbert, V. Luridiana

arxiv:0912.0764 v1 · 2009-12-04 · 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{4SNU2C6AOG3UQUYXMHINRTQDQ5}

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	2026-05-18T02:10:34.103751Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e49b4d0bc071b748531761d0d8ce0387682bd4000b4202dba63b313bf49a75b4

Aliases

arxiv: 0912.0764 · arxiv_version: 0912.0764v1 · doi: 10.48550/arxiv.0912.0764 · pith_short_12: 4SNU2C6AOG3U · pith_short_16: 4SNU2C6AOG3UQUYX · pith_short_8: 4SNU2C6A

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/4SNU2C6AOG3UQUYXMHINRTQDQ5 \
  | 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: e49b4d0bc071b748531761d0d8ce0387682bd4000b4202dba63b313bf49a75b4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d327b4d4d604e5dca51ec70c3dffbe42044d241946eacfbce547974e991bfd68",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-12-04T01:00:38Z",
    "title_canon_sha256": "b64cf644c98a4004e644218e81ee3a81540920f3955711e9875d4199b73f971b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.0764",
    "kind": "arxiv",
    "version": 1
  }
}