Pith Number

pith:YFIP7KC7

pith:2017:YFIP7KC7NHQXDB6KG6P2YUW7D6

not attested not anchored not stored refs pending

Updated sunspot group number reconstruction for 1749-1996 using the active day fraction method

Gennady A. Kovaltsov, Ilya G. Usoskin, Teemu Willamo

arxiv:1705.05109 v1 · 2017-05-15 · 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{YFIP7KC7NHQXDB6KG6P2YUW7D6}

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	2026-05-18T00:44:32.859588Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c150ffa85f69e17187ca379fac52df1f9f405062bca2e1ecce9a489a65ad9a6d

Aliases

arxiv: 1705.05109 · arxiv_version: 1705.05109v1 · doi: 10.48550/arxiv.1705.05109 · pith_short_12: YFIP7KC7NHQX · pith_short_16: YFIP7KC7NHQXDB6K · pith_short_8: YFIP7KC7

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/YFIP7KC7NHQXDB6KG6P2YUW7D6 \
  | 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: c150ffa85f69e17187ca379fac52df1f9f405062bca2e1ecce9a489a65ad9a6d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "763accefeb2473d1454ab31b50f4bceab0425839ac25738c6cb0aa16b6d90bc8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2017-05-15T08:17:38Z",
    "title_canon_sha256": "7378cfb450693fb9abcb2893a39c3fb3ef948be6bcb247bc401d4f6a430f628d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1705.05109",
    "kind": "arxiv",
    "version": 1
  }
}