Pith Number

pith:X4CPFUHW

pith:2018:X4CPFUHWQ53YUINVXD2TDXOE6A

not attested not anchored not stored refs pending

Enhanced sensitivity to a possible variation of the proton-to-electron mass ratio in ammonia

Alec Owens, Sergei N. Yurchenko, Vladimir \v{S}pirko, Walter Thiel

arxiv:1808.05425 v1 · 2018-08-16 · physics.chem-ph · 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{X4CPFUHWQ53YUINVXD2TDXOE6A}

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	2026-05-18T00:07:57.062847Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bf04f2d0f687778a21b5b8f531ddc4f00bf5882d4f0e446e33fe390c83f02d46

Aliases

arxiv: 1808.05425 · arxiv_version: 1808.05425v1 · doi: 10.48550/arxiv.1808.05425 · pith_short_12: X4CPFUHWQ53Y · pith_short_16: X4CPFUHWQ53YUINV · pith_short_8: X4CPFUHW

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/X4CPFUHWQ53YUINVXD2TDXOE6A \
  | 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: bf04f2d0f687778a21b5b8f531ddc4f00bf5882d4f0e446e33fe390c83f02d46

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f1e4226cdcbcf28f4f917e2e225eb292b56a2c62ec5f26bfec0872a035d7b14b",
    "cross_cats_sorted": [
      "physics.atom-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.chem-ph",
    "submitted_at": "2018-08-16T11:34:34Z",
    "title_canon_sha256": "97f006b2935beac9286660468f37b5662bc82d1c25b79cd1ad561d6e6a6e8dc1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1808.05425",
    "kind": "arxiv",
    "version": 1
  }
}