Pith Number

pith:QYCNN5BK

pith:2013:QYCNN5BKVS7KJXWQM7S4TO2GSI

not attested not anchored not stored refs pending

CAPTCHA Based on Human Cognitive Factor

Mohammad Jabed Morshed Chowdhury, Narayan Ranjan Chakraborty

arxiv:1312.7444 v1 · 2013-12-28 · cs.HC · 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{QYCNN5BKVS7KJXWQM7S4TO2GSI}

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	2026-05-18T03:03:43.485196Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8604d6f42aacbea4ded067e5c9bb46923e3351a6686055bd3df925941e2bfcfa

Aliases

arxiv: 1312.7444 · arxiv_version: 1312.7444v1 · doi: 10.48550/arxiv.1312.7444 · pith_short_12: QYCNN5BKVS7K · pith_short_16: QYCNN5BKVS7KJXWQ · pith_short_8: QYCNN5BK

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/QYCNN5BKVS7KJXWQM7S4TO2GSI \
  | 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: 8604d6f42aacbea4ded067e5c9bb46923e3351a6686055bd3df925941e2bfcfa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "45c7ca7cf89e33e4a5e30fe62c70f99a54e2342e32e51c89937d4749c2e897fa",
    "cross_cats_sorted": [
      "cs.CY"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.HC",
    "submitted_at": "2013-12-28T15:28:23Z",
    "title_canon_sha256": "5558030109837ff2c88ed85a47d67d25d05bb08d6180c96cc6efecf1bd8fd9e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1312.7444",
    "kind": "arxiv",
    "version": 1
  }
}