Pith Number

pith:CPO5BWYQ

pith:2019:CPO5BWYQC533UL7S7O6HW23MW6

not attested not anchored not stored refs pending

Analysis of full disc Ca II K spectroheliograms. II. Towards an accurate assessment of long-term variations in plage areas

Ilaria Ermolli, Natalie A. Krivova, Sami K. Solanki, Theodosios Chatzistergos

arxiv:1902.07122 v1 · 2019-02-19 · 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{CPO5BWYQC533UL7S7O6HW23MW6}

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	2026-05-17T23:46:12.269076Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

13ddd0db101777ba2ff2fbbc7b6b6cb7988bb701ec8c149e776f2c2bec82b779

Aliases

arxiv: 1902.07122 · arxiv_version: 1902.07122v1 · doi: 10.48550/arxiv.1902.07122 · pith_short_12: CPO5BWYQC533 · pith_short_16: CPO5BWYQC533UL7S · pith_short_8: CPO5BWYQ

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/CPO5BWYQC533UL7S7O6HW23MW6 \
  | 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: 13ddd0db101777ba2ff2fbbc7b6b6cb7988bb701ec8c149e776f2c2bec82b779

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "af60c47a38d958716083d7acf512556721eff6297323875e8846240a89d80f13",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2019-02-19T16:26:02Z",
    "title_canon_sha256": "7d6c257dc6537e013f3638bc616e091c5349ff8a3aa21aa93d5f8ab6d298bfde"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.07122",
    "kind": "arxiv",
    "version": 1
  }
}