Pith Number

pith:VFAZHOXG

pith:1999:VFAZHOXGZ2O7NCWKTEOCI256NU

not attested not anchored not stored refs pending

Determining the Hubble Constant from Ryle Telescope observations

Alastair Edge(2), Cambridge, Durham, Guy Pooley (1), Keith Grainge (1), Michael E. Jones (1), Richard Saunders(1), Rudiger Kneissl(1) ((1) Cavendish Laboratory, UK), UK (2) Dept of Physics

arxiv:astro-ph/9904165 v2 · 1999-04-13 · 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{VFAZHOXGZ2O7NCWKTEOCI256NU}

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	2026-05-18T01:40:13.248973Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a94193bae6ce9df68aca991c246bbe6d03f5c073a591d8f6b795ea223782b24c

Aliases

arxiv: astro-ph/9904165 · arxiv_version: astro-ph/9904165v2 · doi: 10.48550/arxiv.astro-ph/9904165 · pith_short_12: VFAZHOXGZ2O7 · pith_short_16: VFAZHOXGZ2O7NCWK · pith_short_8: VFAZHOXG

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/VFAZHOXGZ2O7NCWKTEOCI256NU \
  | 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: a94193bae6ce9df68aca991c246bbe6d03f5c073a591d8f6b795ea223782b24c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1012487bd61c042c6278a02ea0cc0a208fe8139b68cfbea426c9126fc8e457c2",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "1999-04-13T12:00:44Z",
    "title_canon_sha256": "5229eda1809360fe8cc1bbcbd7bf3e1c1edd868263862d9b88365f9c4e4dd681"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/9904165",
    "kind": "arxiv",
    "version": 2
  }
}