Pith Number

pith:4GZPH5LE

pith:2018:4GZPH5LEGYCSJ6AVCVTDJHA2UK

not attested not anchored not stored refs pending

A Model of Sunspot Number with Modified Logistic Function

G. Qin, S.-S. Wu

arxiv:1804.03617 v3 · 2018-04-10 · 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{4GZPH5LEGYCSJ6AVCVTDJHA2UK}

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	2026-05-17T23:58:05.036191Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e1b2f3f564360524f8151566349c1aa28a7dd0b5157ca966ce15f7f3913707d4

Aliases

arxiv: 1804.03617 · arxiv_version: 1804.03617v3 · doi: 10.48550/arxiv.1804.03617 · pith_short_12: 4GZPH5LEGYCS · pith_short_16: 4GZPH5LEGYCSJ6AV · pith_short_8: 4GZPH5LE

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/4GZPH5LEGYCSJ6AVCVTDJHA2UK \
  | 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: e1b2f3f564360524f8151566349c1aa28a7dd0b5157ca966ce15f7f3913707d4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "55b039e16fd902a602676984ebf48ef44a50c0f93aef39dffb687fa134ac8f42",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2018-04-10T16:21:01Z",
    "title_canon_sha256": "8ea1495399e6709d0b8ba3c0eae3a025c6bcb105162c72f833ec9d6bb27c7b13"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1804.03617",
    "kind": "arxiv",
    "version": 3
  }
}