Pith Number

pith:VHC6J3SG

pith:2012:VHC6J3SG5N4XABJJ2VQUD55A4R

not attested not anchored not stored refs pending

Variation rate of sunspot area

C.C. Fonte, J. Fernandes, M.A. Pais, R. Gafeira

arxiv:1211.6870 v1 · 2012-11-29 · 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{VHC6J3SG5N4XABJJ2VQUD55A4R}

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	2026-05-18T03:39:42.887547Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a9c5e4ee46eb79700529d56141f7a0e44a01cae5713ffceaa46e20e281d19150

Aliases

arxiv: 1211.6870 · arxiv_version: 1211.6870v1 · doi: 10.48550/arxiv.1211.6870 · pith_short_12: VHC6J3SG5N4X · pith_short_16: VHC6J3SG5N4XABJJ · pith_short_8: VHC6J3SG

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/VHC6J3SG5N4XABJJ2VQUD55A4R \
  | 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: a9c5e4ee46eb79700529d56141f7a0e44a01cae5713ffceaa46e20e281d19150

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0fb603c1e3a18662e71c8b839090c8ebae90c9d6456ee3f2f745a8cdd04facb5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2012-11-29T10:29:00Z",
    "title_canon_sha256": "23a5f44f62ded4521a0abe19989b90515aa1d4def48300f8e9c582ffbd846738"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1211.6870",
    "kind": "arxiv",
    "version": 1
  }
}