Pith Number

pith:33WJNBDL

pith:2009:33WJNBDL5P7BWGILPHQKC4EZ5W

not attested not anchored not stored refs pending

An unexpected topological censor

Peter K. F. Kuhfittig

arxiv:0904.2928 v7 · 2009-04-19 · gr-qc

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{33WJNBDL5P7BWGILPHQKC4EZ5W}

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	2026-05-18T04:05:59.522058Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

deec96846bebfe1b190b79e0a17099ed8003663c695c3a81792b647a3feb6a50

Aliases

arxiv: 0904.2928 · arxiv_version: 0904.2928v7 · doi: 10.48550/arxiv.0904.2928 · pith_short_12: 33WJNBDL5P7B · pith_short_16: 33WJNBDL5P7BWGIL · pith_short_8: 33WJNBDL

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/33WJNBDL5P7BWGILPHQKC4EZ5W \
  | 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: deec96846bebfe1b190b79e0a17099ed8003663c695c3a81792b647a3feb6a50

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "859265c5faf35aab3fade5280d46e48e0d7f3f3a733851a4163231c66b71f28b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2009-04-19T18:58:50Z",
    "title_canon_sha256": "978c1295f6df883c40c0a966c6d8aac6bc53673d29748e67df2595eabffa8126"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.2928",
    "kind": "arxiv",
    "version": 7
  }
}