Pith Number

pith:VUCPHE7X

pith:2002:VUCPHE7XKI2OKG7G3LUVEDA2JY

not attested not anchored not stored refs pending

The orientability of spacetime

Mark J Hadley

arxiv:gr-qc/0202031 v4 · 2002-02-08 · gr-qc · quant-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{VUCPHE7XKI2OKG7G3LUVEDA2JY}

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	2026-07-04T16:33:35.373888Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ad04f393f75234e51be6dae9520c1a4e37c556fa8a43c81ddd40cedcf9eb2113

Aliases

arxiv: gr-qc/0202031 · arxiv_version: gr-qc/0202031v4 · doi: 10.48550/arxiv.gr-qc/0202031 · pith_short_12: VUCPHE7XKI2O · pith_short_16: VUCPHE7XKI2OKG7G · pith_short_8: VUCPHE7X

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/VUCPHE7XKI2OKG7G3LUVEDA2JY \
  | 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: ad04f393f75234e51be6dae9520c1a4e37c556fa8a43c81ddd40cedcf9eb2113

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a5db6ae8df39baac8d4bb4ca77a490efb4b129fb4f183a6fdf01eb2f8ac0e650",
    "cross_cats_sorted": [
      "quant-ph"
    ],
    "license": "",
    "primary_cat": "gr-qc",
    "submitted_at": "2002-02-08T20:31:57Z",
    "title_canon_sha256": "59b1de0c5e6f24288f7c8bef65091774a442b9641620a7a6013512f73d65074b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "gr-qc/0202031",
    "kind": "arxiv",
    "version": 4
  }
}