Pith Number

pith:GTU6TZQB

pith:2009:GTU6TZQBKFEH2BPKHZSQIU35I7

not attested not anchored not stored refs pending

Uncovering the Origins of Spiral Structure by Measuring Radial Variation in Pattern Speeds

Michael R. Merrifield, Richard J. Rand, Sharon E. Meidt

arxiv:0907.3443 v1 · 2009-07-20 · 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{GTU6TZQBKFEH2BPKHZSQIU35I7}

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	2026-05-18T02:12:55.493065Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

34e9e9e60151487d05ea3e6504537d47ff460b0694d0fb871eccf1eb46b11539

Aliases

arxiv: 0907.3443 · arxiv_version: 0907.3443v1 · doi: 10.48550/arxiv.0907.3443 · pith_short_12: GTU6TZQBKFEH · pith_short_16: GTU6TZQBKFEH2BPK · pith_short_8: GTU6TZQB

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/GTU6TZQBKFEH2BPKHZSQIU35I7 \
  | 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: 34e9e9e60151487d05ea3e6504537d47ff460b0694d0fb871eccf1eb46b11539

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fb1398166364ca70e80d532f527f06e720d67dd65c5564374b53ccf45b5ce987",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2009-07-20T19:27:03Z",
    "title_canon_sha256": "d38bb0dc3ae1833012a1d6fb8efbab5e82cc216bc44ea05618219ffa6df88d20"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.3443",
    "kind": "arxiv",
    "version": 1
  }
}