Pith Number

pith:UZ2GJI5R

pith:2015:UZ2GJI5RRBG4NFDLGVZI6RXSVT

not attested not anchored not stored refs pending

A constraint on a varying proton--electron mass ratio 1.5 billion years after the Big Bang

Australia), J. Bagdonaite (1), J. B. Whitmore (2) ((1) VU University Amsterdam, M. T. Murphy (2), Netherlands (2) Swinburne University of Technology, W. Ubachs (1)

arxiv:1501.05533 v1 · 2015-01-22 · 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{UZ2GJI5RRBG4NFDLGVZI6RXSVT}

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	2026-05-18T01:41:09.281016Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a67464a3b1884dc6946b35728f46f2ace52765acfb8680863a6ffa770192c7b3

Aliases

arxiv: 1501.05533 · arxiv_version: 1501.05533v1 · doi: 10.48550/arxiv.1501.05533 · pith_short_12: UZ2GJI5RRBG4 · pith_short_16: UZ2GJI5RRBG4NFDL · pith_short_8: UZ2GJI5R

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/UZ2GJI5RRBG4NFDLGVZI6RXSVT \
  | 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: a67464a3b1884dc6946b35728f46f2ace52765acfb8680863a6ffa770192c7b3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bd383b863d406d044e4ca76a82b15faa00c7269db8b43fb1351e41b3fdeb05c7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2015-01-22T15:25:11Z",
    "title_canon_sha256": "68b53fd39779e27e8f82a0d43b21c5a22d950769719c721b88f70c942cf0d6e6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1501.05533",
    "kind": "arxiv",
    "version": 1
  }
}