Pith Number

pith:DMH3CYLH

pith:2009:DMH3CYLHJG7ZKXCCMPGPNDO4FR

not attested not anchored not stored refs pending

Testing the Stability of the Fine Structure Constant in the Laboratory

A. Matveev, C. Parthey, J. Alnis, N. Kolachevsky, R. Holzwarth, Th. Udem, T. Steinmetz, T.W. Haensch, T. Wilken

arxiv:0904.1663 v1 · 2009-04-10 · quant-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{DMH3CYLHJG7ZKXCCMPGPNDO4FR}

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	2026-05-18T02:14:06.584962Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1b0fb1616749bf955c4263ccf68ddc2c4c06f59cd78b4e10e3d2e6689707ee39

Aliases

arxiv: 0904.1663 · arxiv_version: 0904.1663v1 · doi: 10.48550/arxiv.0904.1663 · pith_short_12: DMH3CYLHJG7Z · pith_short_16: DMH3CYLHJG7ZKXCC · pith_short_8: DMH3CYLH

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/DMH3CYLHJG7ZKXCCMPGPNDO4FR \
  | 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: 1b0fb1616749bf955c4263ccf68ddc2c4c06f59cd78b4e10e3d2e6689707ee39

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "72e1c1c71f262a96a9b2223a48f4d0744f163b8d28cf7b5c9787d21cb6b501fa",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2009-04-10T09:12:51Z",
    "title_canon_sha256": "ed9ee164e632243ddde54d80b23eddf457f02ce47043197a9a0cef2658a5d54d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.1663",
    "kind": "arxiv",
    "version": 1
  }
}