Pith Number

pith:S52CDIUQ

pith:2025:S52CDIUQCIACTKTBTUMCXST6GQ

not attested not anchored not stored refs pending

Constraints on the fractional changes of the fundamental constants at a look-back time of 2.5 Myrs

Di Li, Michael P. Busch, Minfeng Gu, Renzhi Su, Stephen J. Curran, Tao An

arxiv:2502.14576 v1 · 2025-02-20 · astro-ph.GA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{S52CDIUQCIACTKTBTUMCXST6GQ}

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.

Cited by

1 paper in Pith

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

Receipt and verification

First computed	2026-07-05T10:17:29.352752Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

977421a290120029aa619d182bca7e3423be5132579da1f0d97fa2d8c7ff1fcf

Aliases

arxiv: 2502.14576 · arxiv_version: 2502.14576v1 · doi: 10.48550/arxiv.2502.14576 · pith_short_12: S52CDIUQCIAC · pith_short_16: S52CDIUQCIACTKTB · pith_short_8: S52CDIUQ

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/S52CDIUQCIACTKTBTUMCXST6GQ \
  | 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: 977421a290120029aa619d182bca7e3423be5132579da1f0d97fa2d8c7ff1fcf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a37538ede9e0fb2a9e7bf83bac8196e7684bd8f71bdaf2b0debaed5e232686cf",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2025-02-20T14:00:45Z",
    "title_canon_sha256": "f6f2355b27d399fbaecab9f446772b59bb2c6718b1eb31081ed8cac956b86612"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2502.14576",
    "kind": "arxiv",
    "version": 1
  }
}