Pith Number

pith:5JFISCYU

pith:2018:5JFISCYUIDEYOYVUVZXWUJ6BHA

not attested not anchored not stored refs pending

A direct test of density wave theory in a grand-design spiral galaxy

Alfonso Aragon-Salamanca, Anne-Marie Weijmans, Coleman Krawczyk, Karen Masters, Kyle Westfall, Michael Merrifield, Niv Drory, Thomas Peterken

arxiv:1809.08048 v3 · 2018-09-21 · 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{5JFISCYUIDEYOYVUVZXWUJ6BHA}

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	2026-05-17T23:46:29.924027Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ea4a890b1440c98762b4ae6f6a27c13830bd92a168b4602e8736deba795bd287

Aliases

arxiv: 1809.08048 · arxiv_version: 1809.08048v3 · doi: 10.48550/arxiv.1809.08048 · pith_short_12: 5JFISCYUIDEY · pith_short_16: 5JFISCYUIDEYOYVU · pith_short_8: 5JFISCYU

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/5JFISCYUIDEYOYVUVZXWUJ6BHA \
  | 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: ea4a890b1440c98762b4ae6f6a27c13830bd92a168b4602e8736deba795bd287

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "07f2ca253cd4128560760eefb6eb96cfe4b88d244b188540df7b73d11f3102a4",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2018-09-21T11:39:55Z",
    "title_canon_sha256": "c57e6843b978aa78262c3a7ca6ff3790712fa567c4ac1e8f356bb3e1dc8e471c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1809.08048",
    "kind": "arxiv",
    "version": 3
  }
}