Pith Number

pith:IVW7ZAPK

pith:1999:IVW7ZAPKKRENMMXE3NWZAMEOL6

not attested not anchored not stored refs pending

Classical Signature Change in the Black Hole Topology

Ariel Sumeruk, Charles Hellaby, G.F.R. Ellis (University of Cape Town)

arxiv:gr-qc/9907042 v2 · 1999-07-09 · 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{IVW7ZAPKKRENMMXE3NWZAMEOL6}

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	2026-05-18T02:37:27.955842Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

456dfc81ea5448d632e4db6d90308e5f9011246de97c8b07380a3e4509e3b874

Aliases

arxiv: gr-qc/9907042 · arxiv_version: gr-qc/9907042v2 · doi: 10.48550/arxiv.gr-qc/9907042 · pith_short_12: IVW7ZAPKKREN · pith_short_16: IVW7ZAPKKRENMMXE · pith_short_8: IVW7ZAPK

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/IVW7ZAPKKRENMMXE3NWZAMEOL6 \
  | 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: 456dfc81ea5448d632e4db6d90308e5f9011246de97c8b07380a3e4509e3b874

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f14a533a7f11723fc3364c7fa1e736f9eebb6cbd4da1cbf258441aaaaaa3572e",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "1999-07-09T14:54:23Z",
    "title_canon_sha256": "daddd3b4c9bddeee3e4b18e99df5ed87439fcd3b2b85333a1bdbce01ea18a45f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/9907042",
    "kind": "arxiv",
    "version": 2
  }
}