Pith Number

pith:QPF6JHBW

pith:2010:QPF6JHBWTFTOJPNNZDQIFG27EC

not attested not anchored not stored refs pending

Closed timelike curves in measurement-based quantum computation

Elham Kashefi, Ernesto F. Galvao, Raphael Dias da Silva

arxiv:1003.4971 v2 · 2010-03-25 · 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{QPF6JHBWTFTOJPNNZDQIFG27EC}

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	2026-05-18T04:30:48.594462Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

83cbe49c369966e4bdadc8e0829b5f2085c73f551003a3d6c40420b3bf4a8fe7

Aliases

arxiv: 1003.4971 · arxiv_version: 1003.4971v2 · doi: 10.48550/arxiv.1003.4971 · pith_short_12: QPF6JHBWTFTO · pith_short_16: QPF6JHBWTFTOJPNN · pith_short_8: QPF6JHBW

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/QPF6JHBWTFTOJPNNZDQIFG27EC \
  | 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: 83cbe49c369966e4bdadc8e0829b5f2085c73f551003a3d6c40420b3bf4a8fe7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ae48e41a0416fea89271847a6d244bd533f35e42cecc11c2bf7f76a33b9c77ff",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2010-03-25T18:48:56Z",
    "title_canon_sha256": "6001a7bbb6e1db47cea66ab3a75f9e124f66e4d8a5fc75012d86158ae315e486"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1003.4971",
    "kind": "arxiv",
    "version": 2
  }
}