Pith Number

pith:2NCBB2R6

pith:2012:2NCBB2R66LHBXU4L5KA6BO4YK4

not attested not anchored not stored refs pending

Covariance matrices under Bell-like detections

Carlo Ottaviani, Gaetana Spedalieri, Stefano Pirandola

arxiv:1209.4810 v2 · 2012-09-21 · quant-ph · cond-mat.other · math-ph · math.MP · physics.optics

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2NCBB2R66LHBXU4L5KA6BO4YK4}

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	2026-05-18T02:40:45.913416Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d34410ea3ef2ce1bd38bea81e0bb98570acb88da385cfbc578517919848d8992

Aliases

arxiv: 1209.4810 · arxiv_version: 1209.4810v2 · doi: 10.48550/arxiv.1209.4810 · pith_short_12: 2NCBB2R66LHB · pith_short_16: 2NCBB2R66LHBXU4L · pith_short_8: 2NCBB2R6

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/2NCBB2R66LHBXU4L5KA6BO4YK4 \
  | 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: d34410ea3ef2ce1bd38bea81e0bb98570acb88da385cfbc578517919848d8992

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bca877c4de32bf5d011d9c5d65c130f9a29a4b8747b0262904cbdfc397ae29b0",
    "cross_cats_sorted": [
      "cond-mat.other",
      "math-ph",
      "math.MP",
      "physics.optics"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2012-09-21T13:07:22Z",
    "title_canon_sha256": "194e3de5b53097b7e8cfbb72955d4a4ded6a51a067bb88aa95a68d0bf454f510"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1209.4810",
    "kind": "arxiv",
    "version": 2
  }
}