Pith Number

pith:4OIVO5CR

pith:2010:4OIVO5CRXKFHKXWETTMG54DKFT

not attested not anchored not stored refs pending

The Hubble Constant

Barry F. Madore, Wendy L. Freedman

arxiv:1004.1856 v1 · 2010-04-11 · 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{4OIVO5CRXKFHKXWETTMG54DKFT}

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	2026-05-18T02:08:06.938329Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e391577451ba8a755ec49cd86ef06a2cff5b12a1cdec0e737b6333eb314de780

Aliases

arxiv: 1004.1856 · arxiv_version: 1004.1856v1 · doi: 10.48550/arxiv.1004.1856 · pith_short_12: 4OIVO5CRXKFH · pith_short_16: 4OIVO5CRXKFHKXWE · pith_short_8: 4OIVO5CR

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/4OIVO5CRXKFHKXWETTMG54DKFT \
  | 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: e391577451ba8a755ec49cd86ef06a2cff5b12a1cdec0e737b6333eb314de780

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0fe35da890582504f01734d7eb6a2cc0bf3ac84d4ae6bf85673da32026111c21",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2010-04-11T23:51:13Z",
    "title_canon_sha256": "5ce02b1c3a3ec15f84579055c36f7cbbd5260242503fd0a87b70c5133d83a956"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1004.1856",
    "kind": "arxiv",
    "version": 1
  }
}