Pith Number

pith:NREDBSPY

pith:2009:NREDBSPY4GUKRZLAUJIAB4IQ66

not attested not anchored not stored refs pending

Calibrating an updated SPH scheme within GCD+

Brad K. Gibson (UCLan, Daisuke Kawata (MSSL, David J. Barnes (MSSL, Monash), Renyue Cen (Princeton), Takashi Okamoto (Tsukuba), UCL)

arxiv:0902.4002 v3 · 2009-02-23 · 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{NREDBSPY4GUKRZLAUJIAB4IQ66}

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	2026-05-18T02:14:46.208302Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6c4830c9f8e1a8a8e560a25000f110f7b09f9d6fb695d086db6d1b2cccc6a4ce

Aliases

arxiv: 0902.4002 · arxiv_version: 0902.4002v3 · doi: 10.48550/arxiv.0902.4002 · pith_short_12: NREDBSPY4GUK · pith_short_16: NREDBSPY4GUKRZLA · pith_short_8: NREDBSPY

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/NREDBSPY4GUKRZLAUJIAB4IQ66 \
  | 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: 6c4830c9f8e1a8a8e560a25000f110f7b09f9d6fb695d086db6d1b2cccc6a4ce

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dea04d9d1d876a017274fee921f7ca05e62a5425a10b4b8a89e1743a902e2872",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-02-23T21:06:33Z",
    "title_canon_sha256": "806721b6bf0e38a2ca902351f175065459bb61a3b6977016ac2f04c923015233"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.4002",
    "kind": "arxiv",
    "version": 3
  }
}