Pith Number

pith:BCT4WGP5

pith:2012:BCT4WGP5PKAARVRRAZCRDNOCFH

not attested not anchored not stored refs pending

Quantum Cloning by Cellular Automata

C. Macchiavello, G. M. D'Ariano, M. Rossi

arxiv:1212.4704 v2 · 2012-12-19 · 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{BCT4WGP5PKAARVRRAZCRDNOCFH}

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	2026-05-18T03:29:15.835624Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

08a7cb19fd7a8008d631064511b5c229cc3b57e7d655cf7d5af25dd49d01c047

Aliases

arxiv: 1212.4704 · arxiv_version: 1212.4704v2 · doi: 10.48550/arxiv.1212.4704 · pith_short_12: BCT4WGP5PKAA · pith_short_16: BCT4WGP5PKAARVRR · pith_short_8: BCT4WGP5

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/BCT4WGP5PKAARVRRAZCRDNOCFH \
  | 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: 08a7cb19fd7a8008d631064511b5c229cc3b57e7d655cf7d5af25dd49d01c047

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0c74a379cf6fcb43d9eee6a07fdca2a215b08f62b463c7b62ccbdf23bc56b564",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2012-12-19T15:22:16Z",
    "title_canon_sha256": "27ef0305621a5f5b11f005c9648d2716d3a175b2a51d1a4bc37528e54481a7ef"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1212.4704",
    "kind": "arxiv",
    "version": 2
  }
}