Pith Number

pith:XJZ4HDG7

pith:1995:XJZ4HDG74YNO6K2TL7MTUQRHGN

not attested not anchored not stored refs pending

How short can the hair of a black hole be?

Daniel Sudarsky, Dar\'io N\'u\~nez, Hernando Quevedo

arxiv:gr-qc/9510036 v1 · 1995-10-17 · 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{XJZ4HDG74YNO6K2TL7MTUQRHGN}

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	2026-05-18T01:09:17.714788Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ba73c38cdfe61aef2b535fd93a42273368a15ab94dadd7dcfc894adf3c6b4d2a

Aliases

arxiv: gr-qc/9510036 · arxiv_version: gr-qc/9510036v1 · doi: 10.48550/arxiv.gr-qc/9510036 · pith_short_12: XJZ4HDG74YNO · pith_short_16: XJZ4HDG74YNO6K2T · pith_short_8: XJZ4HDG7

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/XJZ4HDG74YNO6K2TL7MTUQRHGN \
  | 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: ba73c38cdfe61aef2b535fd93a42273368a15ab94dadd7dcfc894adf3c6b4d2a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d05ef05fbe1ea400f04922ccfffc97dfd9c34d6dc3962c1961fd8562e2b8eece",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "1995-10-17T18:27:25Z",
    "title_canon_sha256": "f9f522bb4a5e22b2086e726d700c4935a63c6b6e62b667231976b9faaec5bece"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/9510036",
    "kind": "arxiv",
    "version": 1
  }
}