Pith Number

pith:BYWR7ZCG

pith:2008:BYWR7ZCGOUHZMLCLUNATJBLWK2

not attested not anchored not stored refs pending

Cosmic Parallax: possibility of detecting anisotropic expansion of the universe by very accurate astrometry measurements

(2) INAF/OAR, 3), (3) U. of Milano Bicocca), Claudia Quercellini (1), Luca Amendola (2) ((1) U. of Rome Tor Vergata, Miguel Quartin (2

arxiv:0809.3675 v3 · 2008-09-22 · astro-ph · 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{BYWR7ZCGOUHZMLCLUNATJBLWK2}

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	2026-07-04T15:43:48.421961Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0e2d1fe446750f962c4ba34134857656946577c1c9df24a5c8ef0517dabc4875

Aliases

arxiv: 0809.3675 · arxiv_version: 0809.3675v3 · doi: 10.48550/arxiv.0809.3675 · pith_short_12: BYWR7ZCGOUHZ · pith_short_16: BYWR7ZCGOUHZMLCL · pith_short_8: BYWR7ZCG

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/BYWR7ZCGOUHZMLCLUNATJBLWK2 \
  | 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: 0e2d1fe446750f962c4ba34134857656946577c1c9df24a5c8ef0517dabc4875

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2c083632be7e6ae46599f4a2adc06a2cd87687f8ad02a583e727cc476a7e6027",
    "cross_cats_sorted": [
      "gr-qc"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph",
    "submitted_at": "2008-09-22T13:57:15Z",
    "title_canon_sha256": "e52a2f57860b320e47ea923c6545a374511b854ecdd4127086c9e1b3ad5c224c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0809.3675",
    "kind": "arxiv",
    "version": 3
  }
}