Pith Number

pith:NLTTS7GY

pith:2001:NLTTS7GYAC5HCHJUHO3D3QBFHU

not attested not anchored not stored refs pending

New HST spectra indicate the QSO PG1718+4807 will not give the primordial deuterium abundance

Dan Lubin, David Kirkman, David Tytler, E. Joseph Wampler, John M. O'Meara, Michael S. Turner, Nao Suzuki, Robert F. Carswell, Scott Burles

arxiv:astro-ph/0103305 v1 · 2001-03-20 · 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{NLTTS7GYAC5HCHJUHO3D3QBFHU}

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	2026-07-04T16:22:53.915922Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6ae7397cd800ba711d343bb63dc0253d131a56a15b264adfd20aca4d56f161d7

Aliases

arxiv: astro-ph/0103305 · arxiv_version: astro-ph/0103305v1 · doi: 10.48550/arxiv.astro-ph/0103305 · pith_short_12: NLTTS7GYAC5H · pith_short_16: NLTTS7GYAC5HCHJU · pith_short_8: NLTTS7GY

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/NLTTS7GYAC5HCHJUHO3D3QBFHU \
  | 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: 6ae7397cd800ba711d343bb63dc0253d131a56a15b264adfd20aca4d56f161d7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e893a30f501e04836c0b4cd96666501286e09c3fa16fcaa1a305c9e27898b51e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2001-03-20T04:00:44Z",
    "title_canon_sha256": "e8453bc809029f6e50373d1095f728e6d1c228b868177fce4b6b9f0e4dcf8708"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0103305",
    "kind": "arxiv",
    "version": 1
  }
}