Pith Number

pith:U4PL7JUI

pith:2009:U4PL7JUIJ2WZBQRCGGFSLWUPY4

not attested not anchored not stored refs pending

Solar physics at the Kodaikanal Observatory: A Historical Perspective

D.C.V. Mallik, S. P. Bagare, S. P. Rajaguru, S. S. Hasan

arxiv:0906.0144 v1 · 2009-05-31 · physics.hist-ph · 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{U4PL7JUIJ2WZBQRCGGFSLWUPY4}

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	2026-05-18T02:13:30.318406Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a71ebfa6884ead90c222318b25da8fc73e2a5a420bcebd5ee7ca04116b252ecb

Aliases

arxiv: 0906.0144 · arxiv_version: 0906.0144v1 · doi: 10.48550/arxiv.0906.0144 · pith_short_12: U4PL7JUIJ2WZ · pith_short_16: U4PL7JUIJ2WZBQRC · pith_short_8: U4PL7JUI

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/U4PL7JUIJ2WZBQRCGGFSLWUPY4 \
  | 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: a71ebfa6884ead90c222318b25da8fc73e2a5a420bcebd5ee7ca04116b252ecb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6d34ea443fc8d4d40b19170c924187b1f60b4a60825a606ffa8e7a48d3b4a889",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2009-05-31T10:44:42Z",
    "title_canon_sha256": "b074b474e9ae527309e9e4afbfabad6f14418d5126703347f208238ca1558895"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0906.0144",
    "kind": "arxiv",
    "version": 1
  }
}