Pith Number

pith:DPJBF6WJ

pith:2017:DPJBF6WJDUYTBOBBUUK6EWXDVZ

not attested not anchored not stored refs pending

On the Sunspot Group Number Reconstruction: The Backbone Method Revisited

Kenneth H. Schatten, Leif Svalgaard

arxiv:1704.07061 v2 · 2017-04-24 · 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{DPJBF6WJDUYTBOBBUUK6EWXDVZ}

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	2026-05-18T00:34:22.672266Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1bd212fac91d3130b821a515e25ae3ae4977f223075f13b2afc7446a4ee431f3

Aliases

arxiv: 1704.07061 · arxiv_version: 1704.07061v2 · doi: 10.48550/arxiv.1704.07061 · pith_short_12: DPJBF6WJDUYT · pith_short_16: DPJBF6WJDUYTBOBB · pith_short_8: DPJBF6WJ

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/DPJBF6WJDUYTBOBBUUK6EWXDVZ \
  | 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: 1bd212fac91d3130b821a515e25ae3ae4977f223075f13b2afc7446a4ee431f3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "08ddd374eb58acb8813dd88f95e62b44c991e706505232af52a0f984277dc5d8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2017-04-24T07:25:41Z",
    "title_canon_sha256": "0bb2bcc5b31eeefd23b3ae9bec418f6636f5903e0ff20a767fc2e4f31bad16c7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1704.07061",
    "kind": "arxiv",
    "version": 2
  }
}