Pith Number

pith:HR2ZODXK

pith:2008:HR2ZODXKFTS4QXFTCZJVNKDNM5

not attested not anchored not stored refs pending

A signature for the absence of event horizons

G. Chapline, J. Barbieri

arxiv:0812.0833 v2 · 2008-12-03 · astro-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HR2ZODXKFTS4QXFTCZJVNKDNM5}

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	2026-05-18T02:15:11.980832Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3c75970eea2ce5c85cb3165356a86d676e2cd7ff9a057020b11f41d3f75668e2

Aliases

arxiv: 0812.0833 · arxiv_version: 0812.0833v2 · doi: 10.48550/arxiv.0812.0833 · pith_short_12: HR2ZODXKFTS4 · pith_short_16: HR2ZODXKFTS4QXFT · pith_short_8: HR2ZODXK

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/HR2ZODXKFTS4QXFTCZJVNKDNM5 \
  | 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: 3c75970eea2ce5c85cb3165356a86d676e2cd7ff9a057020b11f41d3f75668e2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "26c617ca257d0db99bc09a5474615ccc3f50155ac73f013e9fa32a83dcb15ee4",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-12-03T23:29:09Z",
    "title_canon_sha256": "468625738a74f2162159d9af06e2ad33495a601563918dc6270e44c3e6e2f09e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0812.0833",
    "kind": "arxiv",
    "version": 2
  }
}