Pith Number

pith:KUKGIXRX

pith:2004:KUKGIXRX76UMOK2LV3N4LXMOTI

not attested not anchored not stored refs pending

An Extinction Threshold for Protostellar Cores in Ophiuchus

Doug Johnstone, Helen Kirk, James Di Francesco

arxiv:astro-ph/0406640 v1 · 2004-06-29 · 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{KUKGIXRX76UMOK2LV3N4LXMOTI}

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	2026-07-04T16:44:12.504986Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5514645e37ffa8c72b4baedbc5dd8e9a12ef53d86d39605762cb4460d74de47b

Aliases

arxiv: astro-ph/0406640 · arxiv_version: astro-ph/0406640v1 · doi: 10.48550/arxiv.astro-ph/0406640 · pith_short_12: KUKGIXRX76UM · pith_short_16: KUKGIXRX76UMOK2L · pith_short_8: KUKGIXRX

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/KUKGIXRX76UMOK2LV3N4LXMOTI \
  | 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: 5514645e37ffa8c72b4baedbc5dd8e9a12ef53d86d39605762cb4460d74de47b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e01fce34d701fe2f92d56cad5543bb0aeab73281b55dca58343b28cf25707cc4",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2004-06-29T07:51:31Z",
    "title_canon_sha256": "46cb254b1833e7cd5e6aba102524df0b77721cfe565311ebc86858a1eb7e8639"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0406640",
    "kind": "arxiv",
    "version": 1
  }
}