Pith Number

pith:ETCK4SN2

pith:2016:ETCK4SN2VTPPHV22X7UK5QFWL4

not attested not anchored not stored refs pending

Probing vacuum birefringence using x-ray free electron and optical high-intensity lasers

Chantal Sundqvist, Felix Karbstein

arxiv:1605.09294 v1 · 2016-05-30 · hep-ph · physics.optics · 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{ETCK4SN2VTPPHV22X7UK5QFWL4}

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	2026-05-18T01:11:24.793022Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

24c4ae49baacdef3d75abfe8aec0b65f0a08a7081ae42a71cc1f6c8ef5bb47b2

Aliases

arxiv: 1605.09294 · arxiv_version: 1605.09294v1 · doi: 10.48550/arxiv.1605.09294 · pith_short_12: ETCK4SN2VTPP · pith_short_16: ETCK4SN2VTPPHV22 · pith_short_8: ETCK4SN2

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/ETCK4SN2VTPPHV22X7UK5QFWL4 \
  | 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: 24c4ae49baacdef3d75abfe8aec0b65f0a08a7081ae42a71cc1f6c8ef5bb47b2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4b166c19cac88a0199179df82fffe8c06fa59efa8b56d2f7449519e08693983e",
    "cross_cats_sorted": [
      "physics.optics",
      "quant-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "hep-ph",
    "submitted_at": "2016-05-30T16:03:26Z",
    "title_canon_sha256": "0a9e2c2b5df3b78dd063d76c90ecb2ab10de595df3236881789462de85d1f1bd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1605.09294",
    "kind": "arxiv",
    "version": 1
  }
}