Pith Number

pith:VO7QEJ5M

pith:2013:VO7QEJ5MROR5F2ZIHQOHP45JXR

not attested not anchored not stored refs pending

Why quantum computing is hard - and quantum cryptography is not provably secure

Robert Brady, Ross Anderson

arxiv:1301.7351 v1 · 2013-01-30 · quant-ph · cs.CR · math-ph · math.MP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{VO7QEJ5MROR5F2ZIHQOHP45JXR}

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	2026-05-18T03:35:00.489209Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

abbf0227ac8ba3d2eb283c1c77f3a9bc662407c83bac116dbd7526ff47bb7aee

Aliases

arxiv: 1301.7351 · arxiv_version: 1301.7351v1 · doi: 10.48550/arxiv.1301.7351 · pith_short_12: VO7QEJ5MROR5 · pith_short_16: VO7QEJ5MROR5F2ZI · pith_short_8: VO7QEJ5M

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/VO7QEJ5MROR5F2ZIHQOHP45JXR \
  | 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: abbf0227ac8ba3d2eb283c1c77f3a9bc662407c83bac116dbd7526ff47bb7aee

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b1762519874bcd48116a037f16100240b03ef0be3792d83cd9dada43904fba40",
    "cross_cats_sorted": [
      "cs.CR",
      "math-ph",
      "math.MP"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2013-01-30T20:35:57Z",
    "title_canon_sha256": "52cce1895fdc10927ec6967c7d8adb40f221ac403afa2e75345de0eee18fe7b3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1301.7351",
    "kind": "arxiv",
    "version": 1
  }
}