Pith Number

pith:PDDYUHGU

pith:2014:PDDYUHGUFVDMRDEULF3KLOSTJT

not attested not anchored not stored refs pending

The separate universe problem: 40 years on

B. J. Carr, Tomohiro Harada

arxiv:1405.3624 v1 · 2014-05-14 · astro-ph.CO · 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{PDDYUHGUFVDMRDEULF3KLOSTJT}

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	2026-05-18T02:17:43.130406Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

78c78a1cd42d46c88c945976a5ba534cc51196cb254eb135359ef6a3eaa1da94

Aliases

arxiv: 1405.3624 · arxiv_version: 1405.3624v1 · doi: 10.48550/arxiv.1405.3624 · pith_short_12: PDDYUHGUFVDM · pith_short_16: PDDYUHGUFVDMRDEU · pith_short_8: PDDYUHGU

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/PDDYUHGUFVDMRDEULF3KLOSTJT \
  | 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: 78c78a1cd42d46c88c945976a5ba534cc51196cb254eb135359ef6a3eaa1da94

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "51c6366182fbff85fb2077c5454aba78a08e2c65827ae1c5a548e583d66f53e5",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2014-05-14T19:06:12Z",
    "title_canon_sha256": "08d9b59245e9492f108b27f19934b76098b45e63184f66b6631991bcbb2adf2e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1405.3624",
    "kind": "arxiv",
    "version": 1
  }
}