Pith Number

pith:VJ4HAK6Y

pith:2009:VJ4HAK6Y2I472MKSFWU5E4ITS5

not attested not anchored not stored refs pending

The observational signature of the first H II regions

Jarrett L. Johnson, Ralf S. Klessen, Thomas H. Greif, Volker Bromm

arxiv:0905.1717 v4 · 2009-05-12 · 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{VJ4HAK6Y2I472MKSFWU5E4ITS5}

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	2026-05-18T02:13:45.742388Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

aa78702bd8d239fd31522da9d27113974a907ba168ce08c3825720049d3b1794

Aliases

arxiv: 0905.1717 · arxiv_version: 0905.1717v4 · doi: 10.48550/arxiv.0905.1717 · pith_short_12: VJ4HAK6Y2I47 · pith_short_16: VJ4HAK6Y2I472MKS · pith_short_8: VJ4HAK6Y

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/VJ4HAK6Y2I472MKSFWU5E4ITS5 \
  | 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: aa78702bd8d239fd31522da9d27113974a907ba168ce08c3825720049d3b1794

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2e78efadd260cb34d61b9f2d1a2b753de8765222b74644e683c314c3699d5019",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-05-12T12:47:47Z",
    "title_canon_sha256": "732ecff1e9a12959e2a2b12bc994955b8762de0bdfb710a9b6ad090ce5184f68"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.1717",
    "kind": "arxiv",
    "version": 4
  }
}