Pith Number

pith:WNCZMUPS

pith:2009:WNCZMUPS5THWUNYZOVNT77KPUW

not attested not anchored not stored refs pending

Steric Constraints as a Global Regulation of Growing Leaf Shape

Etienne Couturier, Stephane Douady, Sylvain Courrech du Pont

arxiv:0903.1557 v1 · 2009-03-09 · q-bio.TO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WNCZMUPS5THWUNYZOVNT77KPUW}

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	2026-05-18T04:39:40.835951Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b3459651f2eccf6a3719755b3ffd4fa59f0071056a9ea08f185297711e75e549

Aliases

arxiv: 0903.1557 · arxiv_version: 0903.1557v1 · doi: 10.48550/arxiv.0903.1557 · pith_short_12: WNCZMUPS5THW · pith_short_16: WNCZMUPS5THWUNYZ · pith_short_8: WNCZMUPS

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/WNCZMUPS5THWUNYZOVNT77KPUW \
  | 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: b3459651f2eccf6a3719755b3ffd4fa59f0071056a9ea08f185297711e75e549

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b80cc25c5c5bf7cf3be1ed1a113110cb3857b3b2ee10625a7329797855e4abc9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "q-bio.TO",
    "submitted_at": "2009-03-09T13:42:34Z",
    "title_canon_sha256": "b095bb052a9520118f58b796e3924f721181073ed7a4bc52e3e2cdcf4f1c175f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0903.1557",
    "kind": "arxiv",
    "version": 1
  }
}