Pith Number

pith:U5STXQO7

pith:2011:U5STXQO7QSSMQXTINOBL6TF2KP

not attested not anchored not stored refs pending

A Study of CAPTCHAs for Securing Web Services

M. Tariq Banday, N. A. Shah

arxiv:1112.5605 v1 · 2011-12-23 · cs.CR · cs.CY

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{U5STXQO7QSSMQXTINOBL6TF2KP}

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	2026-05-18T04:05:46.446943Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a7653bc1df84a4c85e686b82bf4cba53dfee5c77b71cee3c4b5de87d8467de2d

Aliases

arxiv: 1112.5605 · arxiv_version: 1112.5605v1 · doi: 10.48550/arxiv.1112.5605 · pith_short_12: U5STXQO7QSSM · pith_short_16: U5STXQO7QSSMQXTI · pith_short_8: U5STXQO7

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/U5STXQO7QSSMQXTINOBL6TF2KP \
  | 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: a7653bc1df84a4c85e686b82bf4cba53dfee5c77b71cee3c4b5de87d8467de2d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bb0332346601f59529517411ff42abf7110356e20ebb0be46d15325508deb73e",
    "cross_cats_sorted": [
      "cs.CY"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2011-12-23T15:46:56Z",
    "title_canon_sha256": "7b7f458f933a5fb75229ad4f7809278e65645076531d0bb86e01c1537cef0366"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.5605",
    "kind": "arxiv",
    "version": 1
  }
}