Pith Number

pith:ZBBZCJNS

pith:2016:ZBBZCJNSDBVCBR3RILWXVBRD3V

not attested not anchored not stored refs pending

The golden age of Calcutta physics: Difficulties in reconstructing the history

Arnab Rai Choudhuri

arxiv:1612.02551 v1 · 2016-12-08 · physics.hist-ph · physics.ed-ph · physics.pop-ph · quant-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZBBZCJNSDBVCBR3RILWXVBRD3V}

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	2026-05-18T00:55:06.217746Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c8439125b2186a20c77142ed7a8623dd4ae06e93aa4a7fe0b0975546ac3d9afa

Aliases

arxiv: 1612.02551 · arxiv_version: 1612.02551v1 · doi: 10.48550/arxiv.1612.02551 · pith_short_12: ZBBZCJNSDBVC · pith_short_16: ZBBZCJNSDBVCBR3R · pith_short_8: ZBBZCJNS

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/ZBBZCJNSDBVCBR3RILWXVBRD3V \
  | 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: c8439125b2186a20c77142ed7a8623dd4ae06e93aa4a7fe0b0975546ac3d9afa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c79500091d3e7e552ce42dadd2f03c8f38d4ca02540c867eed1d25f3e2ef2b2d",
    "cross_cats_sorted": [
      "physics.ed-ph",
      "physics.pop-ph",
      "quant-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.hist-ph",
    "submitted_at": "2016-12-08T07:20:31Z",
    "title_canon_sha256": "a576786d572a6c92df1a6cd39b7788ae5b73e4d586c528a0c0081d8f7bc3f7a8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1612.02551",
    "kind": "arxiv",
    "version": 1
  }
}