Pith Number

pith:HVT7B5P7

pith:2005:HVT7B5P7ISNLWC7WI65CT3WVPZ

not attested not anchored not stored refs pending

Intergalactic HeII absorption towards QSO 1157+3143

C. Fechner, D. Kirkman, D. Reimers, D. Tytler, H.-J. Hagen, P. Jakobsen

arxiv:astro-ph/0507178 v1 · 2005-07-07 · 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{HVT7B5P7ISNLWC7WI65CT3WVPZ}

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	2026-05-18T01:07:31.018267Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3d67f0f5ff449abb0bf647ba29eed57e428f93d9347c589546297192e188897a

Aliases

arxiv: astro-ph/0507178 · arxiv_version: astro-ph/0507178v1 · doi: 10.48550/arxiv.astro-ph/0507178 · pith_short_12: HVT7B5P7ISNL · pith_short_16: HVT7B5P7ISNLWC7W · pith_short_8: HVT7B5P7

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/HVT7B5P7ISNLWC7WI65CT3WVPZ \
  | 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: 3d67f0f5ff449abb0bf647ba29eed57e428f93d9347c589546297192e188897a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ecc1c992e10adc4b3e496758e1f7b862c439d730e414578fb5381de85437be08",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2005-07-07T16:21:31Z",
    "title_canon_sha256": "59c81c1f0d8173bf48faf71664dd3cff47d96cab002edb5ea9820a5192246c45"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0507178",
    "kind": "arxiv",
    "version": 1
  }
}