Pith Number

pith:RI2RK56I

pith:2015:RI2RK56IAVMFYP2FEOXKMYXHZW

not attested not anchored not stored refs pending

Reconstruction of the Sunspot Group Number: the Backbone Method

Kennuth H. Schatten, Leif Svalgaard

arxiv:1506.00755 v1 · 2015-06-02 · 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{RI2RK56IAVMFYP2FEOXKMYXHZW}

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	2026-05-18T01:18:44.758806Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8a351577c805585c3f4523aea662e7cdad51e67ea3727931f187ceb80e0e5228

Aliases

arxiv: 1506.00755 · arxiv_version: 1506.00755v1 · doi: 10.48550/arxiv.1506.00755 · pith_short_12: RI2RK56IAVMF · pith_short_16: RI2RK56IAVMFYP2F · pith_short_8: RI2RK56I

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/RI2RK56IAVMFYP2FEOXKMYXHZW \
  | 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: 8a351577c805585c3f4523aea662e7cdad51e67ea3727931f187ceb80e0e5228

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f9b408264e7495e659361ed8271a4be664c89e3cf06054a4f753ed359b402c22",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2015-06-02T05:33:27Z",
    "title_canon_sha256": "b5a03462aae8364c081acbb47b2fb67203eb01147a1a9ad35a43f0eee703f8d9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1506.00755",
    "kind": "arxiv",
    "version": 1
  }
}