Pith Number

pith:HDSSUYBZ

pith:2013:HDSSUYBZP2JESDYKNJWTNGIXNK

not attested not anchored not stored refs pending

Forty two years counting spots: solar observations by D. E. Hadden during 1890-1931 revisited

J. M. Vaquero, M. C. Gallego, R. M. Trigo, V. M. S. Carrasco

arxiv:1305.6661 v1 · 2013-05-29 · 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{HDSSUYBZP2JESDYKNJWTNGIXNK}

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	2026-05-18T01:49:40.474374Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

38e52a60397e92490f0a6a6d3699176a80585cb054670a9663acd433d99c7092

Aliases

arxiv: 1305.6661 · arxiv_version: 1305.6661v1 · doi: 10.48550/arxiv.1305.6661 · pith_short_12: HDSSUYBZP2JE · pith_short_16: HDSSUYBZP2JESDYK · pith_short_8: HDSSUYBZ

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/HDSSUYBZP2JESDYKNJWTNGIXNK \
  | 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: 38e52a60397e92490f0a6a6d3699176a80585cb054670a9663acd433d99c7092

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4c3d970d015fb850e3110fdaa366da8cc47e1b1b96387ce0d339cb97929431f1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2013-05-29T00:07:46Z",
    "title_canon_sha256": "78cca274ba9ce11c1304570663f8f465502868ce844621a596d4cded449d9798"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1305.6661",
    "kind": "arxiv",
    "version": 1
  }
}