Pith Number

pith:C2WLRSED

pith:2012:C2WLRSEDT5O6JDBR3WNWRDYJ6D

not attested not anchored not stored refs pending

Feathering Instability of Spiral Arms. I: Formulation of the Problem

2) ((1) UCSD, (2) ASIAA), Frank H. Shu (1, Wing-Kit Lee (1)

arxiv:1207.0875 v1 · 2012-07-04 · 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{C2WLRSEDT5O6JDBR3WNWRDYJ6D}

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	2026-05-18T03:48:47.689250Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

16acb8c8839f5de48c31dd9b688f09f0ea71ac2d5f513ff6f541262fd662cf08

Aliases

arxiv: 1207.0875 · arxiv_version: 1207.0875v1 · doi: 10.48550/arxiv.1207.0875 · pith_short_12: C2WLRSEDT5O6 · pith_short_16: C2WLRSEDT5O6JDBR · pith_short_8: C2WLRSED

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/C2WLRSEDT5O6JDBR3WNWRDYJ6D \
  | 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: 16acb8c8839f5de48c31dd9b688f09f0ea71ac2d5f513ff6f541262fd662cf08

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d0bf4081ac678c03af239ddc079720fa62195622c63e4743a6485dc6d96493bd",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2012-07-04T01:37:30Z",
    "title_canon_sha256": "b31b570b1f3f7fadd463e5441db0620b3f02692de47f53d0e04cb2f6ebc2ef23"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1207.0875",
    "kind": "arxiv",
    "version": 1
  }
}