Pith Number

pith:L535WMIY

pith:2005:L535WMIYSG5XBMKVJWFWRRORF2

not attested not anchored not stored refs pending

On variations in the fine-structure constant and stellar pollution of quasar absorption systems

(2) IoA, B. K. Gibson (1) ((1) Swinburne University, Cambridge), M. T. Murphy (2), Y. Fenner (1)

arxiv:astro-ph/0501168 v2 · 2005-01-10 · 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{L535WMIYSG5XBMKVJWFWRRORF2}

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	2026-07-04T15:20:15.091892Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5f77db311891bb70b1554d8b68c5d12eaad31a1db95f2e6469c1010e078e7a62

Aliases

arxiv: astro-ph/0501168 · arxiv_version: astro-ph/0501168v2 · doi: 10.48550/arxiv.astro-ph/0501168 · pith_short_12: L535WMIYSG5X · pith_short_16: L535WMIYSG5XBMKV · pith_short_8: L535WMIY

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/L535WMIYSG5XBMKVJWFWRRORF2 \
  | 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: 5f77db311891bb70b1554d8b68c5d12eaad31a1db95f2e6469c1010e078e7a62

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6a1f6ee37ceaa74442881cecd99e19ecba4d6922efda0463c2ea2c25c08f176c",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "astro-ph",
    "submitted_at": "2005-01-10T21:00:47Z",
    "title_canon_sha256": "e93af2eadb68f907f4996155562393968e57ecc1b7c65bac278a3d5800096654"
  },
  "schema_version": "1.0",
  "source": {
    "id": "astro-ph/0501168",
    "kind": "arxiv",
    "version": 2
  }
}