Pith Number

pith:OPKASH5P

pith:2010:OPKASH5PMNTQDCFNQVMJ5TM2VP

not attested not anchored not stored refs pending

Revisiting the He II to H I ratio in the Intergalactic Medium

Paris), Patrick Petitjean (IAP, Pune), Raghunathan Srianand (IUCAA, Sowgat Muzahid (IUCAA

arxiv:1008.4132 v1 · 2010-08-24 · 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{OPKASH5PMNTQDCFNQVMJ5TM2VP}

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	2026-05-18T02:05:43.119225Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

73d4091faf63670188ad85589ecd9aabc68698c0bb63410273674402d7049806

Aliases

arxiv: 1008.4132 · arxiv_version: 1008.4132v1 · doi: 10.48550/arxiv.1008.4132 · pith_short_12: OPKASH5PMNTQ · pith_short_16: OPKASH5PMNTQDCFN · pith_short_8: OPKASH5P

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/OPKASH5PMNTQDCFNQVMJ5TM2VP \
  | 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: 73d4091faf63670188ad85589ecd9aabc68698c0bb63410273674402d7049806

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "040f86f88916d5589d384338fc15e530c299af8da13d88b4566ea2f66cccd616",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2010-08-24T20:00:05Z",
    "title_canon_sha256": "37d6de4427f9e2899935881358ffcab8940206521a36c816d806a614c9f62c87"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1008.4132",
    "kind": "arxiv",
    "version": 1
  }
}