Pith Number

pith:2PSP577U

pith:2013:2PSP577UYRC3NUQQKIQXI5MMDE

not attested not anchored not stored refs pending

Urchin: A Reverse Ray Tracer for Astrophysical Applications

Gabriel Altay, Tom Theuns

arxiv:1304.4235 v2 · 2013-04-15 · 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{2PSP577UYRC3NUQQKIQXI5MMDE}

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	2026-05-18T03:17:46.439424Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d3e4fefff4c445b6d210522174758c1906219e3f53d9165503c748e8adb07832

Aliases

arxiv: 1304.4235 · arxiv_version: 1304.4235v2 · doi: 10.48550/arxiv.1304.4235 · pith_short_12: 2PSP577UYRC3 · pith_short_16: 2PSP577UYRC3NUQQ · pith_short_8: 2PSP577U

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/2PSP577UYRC3NUQQKIQXI5MMDE \
  | 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: d3e4fefff4c445b6d210522174758c1906219e3f53d9165503c748e8adb07832

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4c9987f0f3eb3398fed52b92fd25a9f7d3a81f6b315370b206ada5253733aa23",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2013-04-15T20:00:04Z",
    "title_canon_sha256": "8fe0ab4544808cf18e2df7b1f753cfd66004f95aac89ac6705b4f0dccaef8086"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.4235",
    "kind": "arxiv",
    "version": 2
  }
}