Pith Number

pith:W2WAJM2R

pith:2018:W2WAJM2R53DMWBUBG5KPTJNE5C

not attested not anchored not stored refs pending

Extreme value theory applied to the millennial sunspot number series

F.J. Acero, I.G. Usoskin, J.A. Garc\'ia, J.M. Vaquero, M.C. Gallego

arxiv:1801.09776 v1 · 2018-01-29 · 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{W2WAJM2R53DMWBUBG5KPTJNE5C}

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	2026-05-18T00:24:53.822165Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b6ac04b351eec6cb06813754f9a5a4e8b6c2ddea1f499ac8386eee76962d855f

Aliases

arxiv: 1801.09776 · arxiv_version: 1801.09776v1 · doi: 10.48550/arxiv.1801.09776 · pith_short_12: W2WAJM2R53DM · pith_short_16: W2WAJM2R53DMWBUB · pith_short_8: W2WAJM2R

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/W2WAJM2R53DMWBUBG5KPTJNE5C \
  | 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: b6ac04b351eec6cb06813754f9a5a4e8b6c2ddea1f499ac8386eee76962d855f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "277f758d4e49052108cd43bf6e8af7ece95b95ef3467d9008b23d066a222871f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2018-01-29T21:49:28Z",
    "title_canon_sha256": "3f46c2e0fca339c0a79baf08baa918d268d6fdd34a83455e88948d5a4e03885b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1801.09776",
    "kind": "arxiv",
    "version": 1
  }
}