Pith Number

pith:X2OTECYM

pith:2020:X2OTECYM63MSCYDEVERJCDLXHW

not attested not anchored not stored refs pending

Sunspot area catalogue revisited: Daily cross-calibrated areas since 1874

Dipankar Banerjee, Natalie A. Krivova, Nimesh Sinha, Sami K. Solanki, Sudip Mandal

arxiv:2004.14618 v1 · 2020-04-30 · 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{X2OTECYM63MSCYDEVERJCDLXHW}

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	2026-07-05T01:28:09.648484Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

be9d320b0cf6d9216064a922910d773db13616ef725f925cee604e6843cf7be7

Aliases

arxiv: 2004.14618 · arxiv_version: 2004.14618v1 · doi: 10.48550/arxiv.2004.14618 · pith_short_12: X2OTECYM63MS · pith_short_16: X2OTECYM63MSCYDE · pith_short_8: X2OTECYM

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/X2OTECYM63MSCYDEVERJCDLXHW \
  | 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: be9d320b0cf6d9216064a922910d773db13616ef725f925cee604e6843cf7be7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "08237a8bda8b5b1fe83b70d6c140ac814e0e0fc84975b4ff67d359c46ff63999",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2020-04-30T07:45:49Z",
    "title_canon_sha256": "99377caeec694a61762a8108ed80d88a0e34c7117b81e8a3086be5daf6e759ef"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2004.14618",
    "kind": "arxiv",
    "version": 1
  }
}