Pith Number

pith:PT57WFRC

pith:2009:PT57WFRCXXBAK5A6BOABXWMVFA

not attested not anchored not stored refs pending

Vainu Bappu Memorial Lecture: What is a sunspot?

D. O. Gough

arxiv:0909.5338 v3 · 2009-09-29 · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PT57WFRCXXBAK5A6BOABXWMVFA}

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	2026-05-18T02:11:36.446113Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7cfbfb1622bdc205741e0b801bd9952826898b778fdb40b128ff9170f7366895

Aliases

arxiv: 0909.5338 · arxiv_version: 0909.5338v3 · doi: 10.48550/arxiv.0909.5338 · pith_short_12: PT57WFRCXXBA · pith_short_16: PT57WFRCXXBAK5A6 · pith_short_8: PT57WFRC

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/PT57WFRCXXBAK5A6BOABXWMVFA \
  | 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: 7cfbfb1622bdc205741e0b801bd9952826898b778fdb40b128ff9170f7366895

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b6a452f98b611e218d7c9dc58aa795e50cf9711e13f1692d3431d7aa37ce92a5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-09-29T13:34:30Z",
    "title_canon_sha256": "90a3a605389f4864524204262507fc89c335c5b33b7f9d85a624979fea4d594e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0909.5338",
    "kind": "arxiv",
    "version": 3
  }
}