Pith Number

pith:2SE2VPQZ

pith:2009:2SE2VPQZP5L4O52MSL72ZO3MY6

not attested not anchored not stored refs pending

Pattern Speeds of Bars and Spiral Arms From H-alpha Velocity Fields

Claude Carignan, Inma Martinez-Valpuesta, John Beckman, Kambiz Fathi, Nuria Pi\~nol-Ferrer, Olivier Hernandez

arxiv:0909.1816 v1 · 2009-09-09 · astro-ph.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2SE2VPQZP5L4O52MSL72ZO3MY6}

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	2026-05-18T02:34:30.602678Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d489aabe197f57c7774c92ffacbb6cc79cbc120fd5e215b4599681fe55127899

Aliases

arxiv: 0909.1816 · arxiv_version: 0909.1816v1 · doi: 10.48550/arxiv.0909.1816 · pith_short_12: 2SE2VPQZP5L4 · pith_short_16: 2SE2VPQZP5L4O52M · pith_short_8: 2SE2VPQZ

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/2SE2VPQZP5L4O52MSL72ZO3MY6 \
  | 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: d489aabe197f57c7774c92ffacbb6cc79cbc120fd5e215b4599681fe55127899

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1aa042a1d513a13eaf0a00f8a30988bdb73ffafc44d1ce8c623b989f608d1aa0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2009-09-09T22:15:04Z",
    "title_canon_sha256": "b081e8303db1cb6c2144373053b480f767d5b30b376c6b4f444ca95595468f17"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.1816",
    "kind": "arxiv",
    "version": 1
  }
}