Pith Number

pith:UMKU22IO

pith:2013:UMKU22IOYHDHLDPOKJQB2JAA3E

not attested not anchored not stored refs pending

New Precision Measurement of Hyperfine Splitting of Positronium

A. Ishida, A. Yamamoto, H. Saito, K. Tanaka, M. Yoshida, S. Asai, T. Kobayashi, T. Namba

arxiv:1310.6923 v4 · 2013-10-25 · hep-ex · 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{UMKU22IOYHDHLDPOKJQB2JAA3E}

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	2026-05-18T02:50:13.264081Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a3154d690ec1c6758dee52601d2400d907f9b6f0166a738ec4a638bac86ca9d8

Aliases

arxiv: 1310.6923 · arxiv_version: 1310.6923v4 · doi: 10.48550/arxiv.1310.6923 · pith_short_12: UMKU22IOYHDH · pith_short_16: UMKU22IOYHDHLDPO · pith_short_8: UMKU22IO

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/UMKU22IOYHDHLDPOKJQB2JAA3E \
  | 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: a3154d690ec1c6758dee52601d2400d907f9b6f0166a738ec4a638bac86ca9d8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6e049c897b9d3090b973665b57c87976ff5dd230a68e1eac08ee8883410136a1",
    "cross_cats_sorted": [
      "physics.atom-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "hep-ex",
    "submitted_at": "2013-10-25T14:02:57Z",
    "title_canon_sha256": "c0d1173b7d1053d8d40820741e30bf4036427ac7bfb5a04c446c793032d5a237"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1310.6923",
    "kind": "arxiv",
    "version": 4
  }
}