Pith Number

pith:QDVIIBXP

pith:2011:QDVIIBXP34XAB4XWWQVNST737P

not attested not anchored not stored refs pending

First constraint on cosmological variation of the proton-to-electron mass ratio from two independent telescopes

Adrian L. Malec, Freek van Weerdenburg, Lex Kaper, Michael T. Murphy, Wim Ubachs

arxiv:1104.2969 v1 · 2011-04-15 · astro-ph.CO · physics.atom-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{QDVIIBXP34XAB4XWWQVNST737P}

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	2026-05-18T04:21:50.337536Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

80ea8406efdf2e00f2f6b42ad94ffbfbe5cfb72351a51c30e64ec9bf8d6d32a7

Aliases

arxiv: 1104.2969 · arxiv_version: 1104.2969v1 · doi: 10.48550/arxiv.1104.2969 · pith_short_12: QDVIIBXP34XA · pith_short_16: QDVIIBXP34XAB4XW · pith_short_8: QDVIIBXP

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/QDVIIBXP34XAB4XWWQVNST737P \
  | 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: 80ea8406efdf2e00f2f6b42ad94ffbfbe5cfb72351a51c30e64ec9bf8d6d32a7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d0de250e587b0485fc3e6188a26ca5613cfa5c4e6a8e03fe1805ff2cd09b140b",
    "cross_cats_sorted": [
      "physics.atom-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2011-04-15T06:56:16Z",
    "title_canon_sha256": "e127430e8cda55eecbe29626668ab68a282ee9a1ef5293ed77f45262a9973044"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1104.2969",
    "kind": "arxiv",
    "version": 1
  }
}