Pith Number

pith:KCHX4PXK

pith:2013:KCHX4PXKETCVAAI43V5PPKKWDP

not attested not anchored not stored refs pending

Sunspot positions and sizes for 1825-1867 from the observations by Samuel Heinrich Schwabe

I.G. Usoskin, K. Mursula, N. Giese, R. Arlt, R. Leussu

arxiv:1305.7400 v1 · 2013-05-31 · 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{KCHX4PXKETCVAAI43V5PPKKWDP}

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	2026-05-18T01:49:39.170162Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

508f7e3eea24c550011cdd7af7a9561bec95fbc46391d983062396f7b6dd3036

Aliases

arxiv: 1305.7400 · arxiv_version: 1305.7400v1 · doi: 10.48550/arxiv.1305.7400 · pith_short_12: KCHX4PXKETCV · pith_short_16: KCHX4PXKETCVAAI4 · pith_short_8: KCHX4PXK

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/KCHX4PXKETCVAAI43V5PPKKWDP \
  | 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: 508f7e3eea24c550011cdd7af7a9561bec95fbc46391d983062396f7b6dd3036

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "107fbc7ba02d5306a2e0a4f6f883637449830c4b2abcf357c71601b7ba733b31",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2013-05-31T13:47:05Z",
    "title_canon_sha256": "f2ef3511f3bd3743706493c56bf6d83a4ec997395c6e9208c6cbfbf6e583d1d2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1305.7400",
    "kind": "arxiv",
    "version": 1
  }
}