Pith Number

pith:4KACZISF

pith:2010:4KACZISFHZ3WOPESHEIV673QHB

not attested not anchored not stored refs pending

Sunspot group tilt angles and the strength of the solar cycle

Maria Dasi-Espuig, Natasha A. Krivova, Robert H. Cameron, Sami K. Solanki, Tania Pe\~nuela

arxiv:1005.1774 v1 · 2010-05-11 · astro-ph.SR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4KACZISFHZ3WOPESHEIV673QHB}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-18T02:07:34.402901Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e2802ca2453e77673c9239115f7f70387e7ddbf8ed342baed4577ff65ca1978f

Aliases

arxiv: 1005.1774 · arxiv_version: 1005.1774v1 · doi: 10.48550/arxiv.1005.1774 · pith_short_12: 4KACZISFHZ3W · pith_short_16: 4KACZISFHZ3WOPES · pith_short_8: 4KACZISF

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/4KACZISFHZ3WOPESHEIV673QHB \
  | 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: e2802ca2453e77673c9239115f7f70387e7ddbf8ed342baed4577ff65ca1978f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3aa234800ec28f0a42fb8f17458053de734e40455f0bb9d3bac712526b05dbef",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2010-05-11T09:28:24Z",
    "title_canon_sha256": "24b9d189ae6e359b047e3749685ca65d33ae0229f88ef5a3decf4080610cfa2e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1005.1774",
    "kind": "arxiv",
    "version": 1
  }
}