Pith Number

pith:67QMV3VW

pith:2013:67QMV3VWWJFH4N3N2VXPUI2CI2

not attested not anchored not stored refs pending

Three-Way Dissection of a Game-CAPTCHA: Automated Attacks, Relay Attacks, and Usability

Chengcui Zhang, Manar Mohamed, Michael Georgescu, Niharika Sachdeva, Nitesh Saxena, Paul C. van Oorschot, Ponnurangam Kumaraguru, Song Gao, Wei-Bang Chen

arxiv:1310.1540 v1 · 2013-10-06 · cs.CR · cs.HC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{67QMV3VWWJFH4N3N2VXPUI2CI2}

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	2026-05-18T03:11:00.017626Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f7e0caeeb6b24a7e376dd56efa234246ba5ddbdfaba0b64d44c34ff2206bf540

Aliases

arxiv: 1310.1540 · arxiv_version: 1310.1540v1 · doi: 10.48550/arxiv.1310.1540 · pith_short_12: 67QMV3VWWJFH · pith_short_16: 67QMV3VWWJFH4N3N · pith_short_8: 67QMV3VW

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/67QMV3VWWJFH4N3N2VXPUI2CI2 \
  | 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: f7e0caeeb6b24a7e376dd56efa234246ba5ddbdfaba0b64d44c34ff2206bf540

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7235fff04b9370d44007d2faf911a2d8bd504e13526196ef5e7f6b25931ef208",
    "cross_cats_sorted": [
      "cs.HC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2013-10-06T05:02:35Z",
    "title_canon_sha256": "2bf3336a6455d7cffd35841e8b927b1dd2f5403cd8ec26d084228c0c0f6b5c95"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1310.1540",
    "kind": "arxiv",
    "version": 1
  }
}