Pith Number

pith:CMGNHHDB

pith:2012:CMGNHHDBQ6XZSL5COROUIRQ6BM

not attested not anchored not stored refs pending

A reanalysis of quasar absorption spectra results suggesting a spatial gradient in values of the fine-structure constant

E. M. Kava, J. C. Berengut, V. V. Flambaum

arxiv:1203.5891 v2 · 2012-03-27 · astro-ph.CO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CMGNHHDBQ6XZSL5COROUIRQ6BM}

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	2026-05-18T03:49:45.497559Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

130cd39c6187af992fa2745d44461e0b11d91f86dbfd7995f361563488359a68

Aliases

arxiv: 1203.5891 · arxiv_version: 1203.5891v2 · doi: 10.48550/arxiv.1203.5891 · pith_short_12: CMGNHHDBQ6XZ · pith_short_16: CMGNHHDBQ6XZSL5C · pith_short_8: CMGNHHDB

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/CMGNHHDBQ6XZSL5COROUIRQ6BM \
  | 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: 130cd39c6187af992fa2745d44461e0b11d91f86dbfd7995f361563488359a68

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "624cc5fb7c57663bfe74eab2e7e51e8a6ae1913e798dcfc527f7fb6f744f5f58",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-03-27T08:10:24Z",
    "title_canon_sha256": "489ee61e99b29e178ecda91101860fc7063dd33c6a916a97c6ebf3ef6c64b02f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.5891",
    "kind": "arxiv",
    "version": 2
  }
}