Pith Number

pith:3FO6FLAX

pith:2009:3FO6FLAXJTDHVQQMPHQIB6A3J6

not attested not anchored not stored refs pending

Hydrogen Self Shielding in a Quasar Proximity Zone

Gabriel Altay, Rupert A. C. Croft, Tiziana Di Matteo

arxiv:0910.5233 v2 · 2009-10-28 · 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{3FO6FLAXJTDHVQQMPHQIB6A3J6}

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	2026-05-18T03:17:54.308563Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d95de2ac174cc67ac20c79e080f81b4fadf41841fa0b2f5749c63291f443a349

Aliases

arxiv: 0910.5233 · arxiv_version: 0910.5233v2 · doi: 10.48550/arxiv.0910.5233 · pith_short_12: 3FO6FLAXJTDH · pith_short_16: 3FO6FLAXJTDHVQQM · pith_short_8: 3FO6FLAX

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/3FO6FLAXJTDHVQQMPHQIB6A3J6 \
  | 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: d95de2ac174cc67ac20c79e080f81b4fadf41841fa0b2f5749c63291f443a349

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c1b6721b0feb2b346b67ae786e6bb17dbe56a9592f0eaaf79280d9ded8e0bd5c",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-10-28T04:42:56Z",
    "title_canon_sha256": "ac8b8b775c1e17faab4e8563441e004e884d069b576e549d7208a2ce42ef8ebf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.5233",
    "kind": "arxiv",
    "version": 2
  }
}