Pith Number

pith:43LC4RR4

pith:2014:43LC4RR4HN35UNBJT3QFXOWZEV

not attested not anchored not stored refs pending

Bypassing Captcha By Machine A Proof For Passing The Turing Test

Ahmad B. A. Hassanat

arxiv:1409.0925 v1 · 2014-09-03 · cs.CV · cs.AI · 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{43LC4RR4HN35UNBJT3QFXOWZEV}

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	2026-05-18T02:43:44.745276Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e6d62e463c3b77da34299ee05bbad9254a42ec3a93268b1c372c13902dbe89ed

Aliases

arxiv: 1409.0925 · arxiv_version: 1409.0925v1 · doi: 10.48550/arxiv.1409.0925 · pith_short_12: 43LC4RR4HN35 · pith_short_16: 43LC4RR4HN35UNBJ · pith_short_8: 43LC4RR4

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/43LC4RR4HN35UNBJT3QFXOWZEV \
  | 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: e6d62e463c3b77da34299ee05bbad9254a42ec3a93268b1c372c13902dbe89ed

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d3c4ac8c345032f0ba414dd8d345defa4e1b895dd17e4080f70629b84ad23ba0",
    "cross_cats_sorted": [
      "cs.AI",
      "cs.HC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2014-09-03T00:05:28Z",
    "title_canon_sha256": "441db14ac49ab3b9caacbe93cc9bd917776b125ddb34f8d62bc05b4d76268800"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1409.0925",
    "kind": "arxiv",
    "version": 1
  }
}