Pith Number

pith:FYBFQ3XV

pith:2025:FYBFQ3XVGEM2SZTBMPIZVZEBMI

not attested not anchored not stored refs pending

New constraints on the values of the fundamental constants at a look-back time of 7.3 Gyr

Di Li, Francoise Combes, Minfeng Gu, Neeraj Gupta, Renzhi Su, Sebastien Muller, Stephen J. Curran

arxiv:2505.07200 v2 · 2025-05-12 · 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{FYBFQ3XVGEM2SZTBMPIZVZEBMI}

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	2026-07-05T11:21:46.486681Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2e02586ef53119a9666163d19ae481620b28d4cf2e6d427e64e1ec8813cede9f

Aliases

arxiv: 2505.07200 · arxiv_version: 2505.07200v2 · doi: 10.48550/arxiv.2505.07200 · pith_short_12: FYBFQ3XVGEM2 · pith_short_16: FYBFQ3XVGEM2SZTB · pith_short_8: FYBFQ3XV

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/FYBFQ3XVGEM2SZTBMPIZVZEBMI \
  | 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: 2e02586ef53119a9666163d19ae481620b28d4cf2e6d427e64e1ec8813cede9f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "be5a649cacc1678f4bbe8ffdc3ae29cc4b74aaf2760541102f1ad08df1df9a30",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2025-05-12T03:15:12Z",
    "title_canon_sha256": "ea77c88e40b2f3eb3f76686168610d1f9666dcfd48a279a0d2ae40eeb17e174a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2505.07200",
    "kind": "arxiv",
    "version": 2
  }
}