Pith Number

pith:24UPK2RD

pith:2015:24UPK2RDU6YU6TP7NBDWWOAVIE

not attested not anchored not stored refs pending

The revised Brussels-Locarno Sunspot Number (1981-2015)

Andreas Bulling, Fr\'ed\'eric Clette, Laure Lef\`evre, Marco Cagnotti, Sergio Cortesi

arxiv:1507.07803 v1 · 2015-07-28 · 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{24UPK2RDU6YU6TP7NBDWWOAVIE}

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	2026-07-05T05:30:53.878170Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d728f56a23a7b14f4dff68476b3815410eeb7a801377a613b6cab2b245a015d3

Aliases

arxiv: 1507.07803 · arxiv_version: 1507.07803v1 · doi: 10.48550/arxiv.1507.07803 · pith_short_12: 24UPK2RDU6YU · pith_short_16: 24UPK2RDU6YU6TP7 · pith_short_8: 24UPK2RD

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/24UPK2RDU6YU6TP7NBDWWOAVIE \
  | 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: d728f56a23a7b14f4dff68476b3815410eeb7a801377a613b6cab2b245a015d3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4c303b422adb4401a6302864685d0c1a6c26d79936c753512217e47e2e083289",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2015-07-28T15:17:38Z",
    "title_canon_sha256": "0b9102a714d7597e5745c10779cd92792aa1ec63524d738158c7adfbce2e7c20"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1507.07803",
    "kind": "arxiv",
    "version": 1
  }
}