Pith Number

pith:QDGULO3U

pith:2007:QDGULO3U3CXO3TGWS43T4XIUXA

not attested not anchored not stored refs pending

The Hubble Constant

Jodrell Bank Centre for Astrophysics), Neal Jackson (University of Manchester

arxiv:0709.3924 v2 · 2007-09-25 · 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{QDGULO3U3CXO3TGWS43T4XIUXA}

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	2026-05-18T02:16:10.996279Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

80cd45bb74d8aeedccd697373e5d14b8167c1a7866b2bc5de641643b944b0599

Aliases

arxiv: 0709.3924 · arxiv_version: 0709.3924v2 · doi: 10.48550/arxiv.0709.3924 · pith_short_12: QDGULO3U3CXO · pith_short_16: QDGULO3U3CXO3TGW · pith_short_8: QDGULO3U

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/QDGULO3U3CXO3TGWS43T4XIUXA \
  | 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: 80cd45bb74d8aeedccd697373e5d14b8167c1a7866b2bc5de641643b944b0599

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "089e2c964ebc78cd5e26a61abb658a58bfc4a796210c0127d6352f4a1c604248",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2007-09-25T11:37:41Z",
    "title_canon_sha256": "5ce02b1c3a3ec15f84579055c36f7cbbd5260242503fd0a87b70c5133d83a956"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0709.3924",
    "kind": "arxiv",
    "version": 2
  }
}