Pith Number

pith:JNLTGWC4

pith:2009:JNLTGWC4UJ2TPPW4VAWSTXCUJ7

not attested not anchored not stored refs pending

A k-NN Method to Classify Rare Astronomical Sources: Photometric Search of Brown Dwarfs with Spitzer/IRAC

Massimo Marengo, Mayly C. Sanchez

arxiv:0904.3749 v1 · 2009-04-23 · astro-ph.IM · astro-ph.SR

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{JNLTGWC4UJ2TPPW4VAWSTXCUJ7}

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	2026-05-18T02:13:57.670928Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4b5733585ca27537bedca82d29dc544fd1c2e76004515ac0a4d0cef48fdf2573

Aliases

arxiv: 0904.3749 · arxiv_version: 0904.3749v1 · doi: 10.48550/arxiv.0904.3749 · pith_short_12: JNLTGWC4UJ2T · pith_short_16: JNLTGWC4UJ2TPPW4 · pith_short_8: JNLTGWC4

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/JNLTGWC4UJ2TPPW4VAWSTXCUJ7 \
  | 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: 4b5733585ca27537bedca82d29dc544fd1c2e76004515ac0a4d0cef48fdf2573

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "65bfe63b19535591fdbbc3efdf6d5a931f5ed7c749dfbc2c62842193fdfc9b94",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.IM",
    "submitted_at": "2009-04-23T20:11:39Z",
    "title_canon_sha256": "5a9b73017af52628cc3efa886c3de8a55a263fd7cf535ecfc7b236d204f3f85a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.3749",
    "kind": "arxiv",
    "version": 1
  }
}