Pith Number

pith:DW4UYN4I

pith:2009:DW4UYN4IKXPJDQQYLUPJJYEVVX

not attested not anchored not stored refs pending

Note on the invariant classification of vacuum type D spacetimes

A. Coley, S. Hervik

arxiv:0911.4923 v1 · 2009-11-25 · 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{DW4UYN4IKXPJDQQYLUPJJYEVVX}

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	2026-05-18T02:10:36.710338Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1db94c378855de91c2185d1e94e095adda8b079efff9ecb9c80ebd62f23afea8

Aliases

arxiv: 0911.4923 · arxiv_version: 0911.4923v1 · doi: 10.48550/arxiv.0911.4923 · pith_short_12: DW4UYN4IKXPJ · pith_short_16: DW4UYN4IKXPJDQQY · pith_short_8: DW4UYN4I

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/DW4UYN4IKXPJDQQYLUPJJYEVVX \
  | 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: 1db94c378855de91c2185d1e94e095adda8b079efff9ecb9c80ebd62f23afea8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "da4dbd6aad1ac74f7cb66e0f287b86b58c3335651dc73f5b309acac1aa3a3050",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2009-11-25T17:22:39Z",
    "title_canon_sha256": "c411362d94d9d1d8d36b63f9e05d7f1530225818c3fbf86be1c8ce4dfc17bbd1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0911.4923",
    "kind": "arxiv",
    "version": 1
  }
}