Pith Number

pith:QNPPZTLA

pith:2008:QNPPZTLAZAZU4TCUX2U4N4EV6X

not attested not anchored not stored refs pending

Slices of the Kerr ergosurface

Ted Jacobson, Yee-Ann Soong

arxiv:0809.2369 v2 · 2008-09-13 · gr-qc · astro-ph · hep-th · math-ph · math.DG · math.MP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QNPPZTLAZAZU4TCUX2U4N4EV6X}

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	2026-07-04T15:38:17.171325Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

835efccd60c8334e4c54bea9c6f095f5fe9e6cde9ae8d473e68f85c4b9975610

Aliases

arxiv: 0809.2369 · arxiv_version: 0809.2369v2 · doi: 10.48550/arxiv.0809.2369 · pith_short_12: QNPPZTLAZAZU · pith_short_16: QNPPZTLAZAZU4TCU · pith_short_8: QNPPZTLA

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/QNPPZTLAZAZU4TCUX2U4N4EV6X \
  | 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: 835efccd60c8334e4c54bea9c6f095f5fe9e6cde9ae8d473e68f85c4b9975610

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ed9cebb862ea019815dfd14adc8bb62904ddc3e112184044d6fc02c16a3f41e5",
    "cross_cats_sorted": [
      "astro-ph",
      "hep-th",
      "math-ph",
      "math.DG",
      "math.MP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "gr-qc",
    "submitted_at": "2008-09-13T21:09:40Z",
    "title_canon_sha256": "be0ad3fea09aff423b6da8393f7e2abbf8beaade7683b21ecd85f02c9f904d38"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0809.2369",
    "kind": "arxiv",
    "version": 2
  }
}