Pith Number

pith:T7QE55FV

pith:2011:T7QE55FV6HMFWBYOWBLU4IEYFZ

not attested not anchored not stored refs pending

Constraint on a variation of the proton-to-electron mass ratio from H2 absorption towards quasar Q2348-011

(2) Swinburne University, 3), (3) University of Amsterdam), Julija Bagdonaite (1), Lex Kaper (1, Michael T. Murphy (2), Wim Ubachs (1) ((1) VU Amsterdam

arxiv:1112.0428 v1 · 2011-12-02 · 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{T7QE55FV6HMFWBYOWBLU4IEYFZ}

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	2026-05-18T01:59:18.114956Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9fe04ef4b5f1d85b070eb0574e20982e635ee2cc36591b33c67b1846058a90e9

Aliases

arxiv: 1112.0428 · arxiv_version: 1112.0428v1 · doi: 10.48550/arxiv.1112.0428 · pith_short_12: T7QE55FV6HMF · pith_short_16: T7QE55FV6HMFWBYO · pith_short_8: T7QE55FV

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/T7QE55FV6HMFWBYOWBLU4IEYFZ \
  | 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: 9fe04ef4b5f1d85b070eb0574e20982e635ee2cc36591b33c67b1846058a90e9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cbe45bd29b459ae1560259e28f5f4a09f19046d7bfcbfd3d239d77d97abb58bf",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-12-02T11:30:35Z",
    "title_canon_sha256": "a258903e21076d8472d4e665baebd17de72d3f54e25924836029c1a37ac450d2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.0428",
    "kind": "arxiv",
    "version": 1
  }
}