Pith Number

pith:ARLJ2XA2

pith:2015:ARLJ2XA2ESPTWONQDOSOXS2O42

not attested not anchored not stored refs pending

A New Calibrated Sunspot Group Series Since 1749: Statistics of Active Day Fractions

G.A. Kovaltsov, I.G. Usoskin, K. Mursula, M. Lockwood, M. Owens, S.K. Solanki

arxiv:1512.06421 v1 · 2015-12-20 · 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{ARLJ2XA2ESPTWONQDOSOXS2O42}

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	2026-05-18T01:21:25.717574Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

04569d5c1a249f3b39b01ba4ebcb4ee6b049fde57ffb6ea993baf86296c0390a

Aliases

arxiv: 1512.06421 · arxiv_version: 1512.06421v1 · doi: 10.48550/arxiv.1512.06421 · pith_short_12: ARLJ2XA2ESPT · pith_short_16: ARLJ2XA2ESPTWONQ · pith_short_8: ARLJ2XA2

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/ARLJ2XA2ESPTWONQDOSOXS2O42 \
  | 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: 04569d5c1a249f3b39b01ba4ebcb4ee6b049fde57ffb6ea993baf86296c0390a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "af33a04142904c7323dcaaac5bd2fd140187290fcca083837c963dcef56838a0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2015-12-20T19:30:05Z",
    "title_canon_sha256": "6bac754d3667bde5645ed0a53d19064377304afcd07a8e15bf04e8cf9e99557a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1512.06421",
    "kind": "arxiv",
    "version": 1
  }
}