Pith Number

pith:HGVEFV4I

pith:2010:HGVEFV4IEJZU4FOSJFLY47N5UT

not attested not anchored not stored refs pending

The primordial abundance of 4He: evidence for non-standard big bang nucleosynthesis

(2) University of Virginia, Charlottesville, Kyiv, T. X. Thuan (2) ((1) Main Astronomical Observatory, Ukraine, USA), Y. I. Izotov (1)

arxiv:1001.4440 v1 · 2010-01-25 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HGVEFV4IEJZU4FOSJFLY47N5UT}

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	2026-05-18T02:09:30.340506Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

39aa42d78822734e15d249578e7dbda4ed9e50b5a8fa8cf829302d83584b68b4

Aliases

arxiv: 1001.4440 · arxiv_version: 1001.4440v1 · doi: 10.48550/arxiv.1001.4440 · pith_short_12: HGVEFV4IEJZU · pith_short_16: HGVEFV4IEJZU4FOS · pith_short_8: HGVEFV4I

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/HGVEFV4IEJZU4FOSJFLY47N5UT \
  | 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: 39aa42d78822734e15d249578e7dbda4ed9e50b5a8fa8cf829302d83584b68b4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "205d719d1eb7a2a7db9313f4df5e412f499ca631410c5233e128986f6d93af9c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2010-01-25T14:43:24Z",
    "title_canon_sha256": "ead6823be5e353d2bf07079986f42ef3f08e0c73044f59a98c08b34c62e3a6d2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1001.4440",
    "kind": "arxiv",
    "version": 1
  }
}