Pith Number

pith:BIIUEOXF

pith:2017:BIIUEOXFHH6HVBZOMYR4U2DJDD

not attested not anchored not stored refs pending

Making Defeating CAPTCHAs Harder for Bots

Nasser Mohammed Al-Fannah

arxiv:1704.02803 v1 · 2017-04-10 · cs.CR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BIIUEOXFHH6HVBZOMYR4U2DJDD}

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	2026-05-18T00:46:44.378240Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0a11423ae539fc7a872e6623ca686918f1066a7076c6347d779ca9700375a653

Aliases

arxiv: 1704.02803 · arxiv_version: 1704.02803v1 · doi: 10.48550/arxiv.1704.02803 · pith_short_12: BIIUEOXFHH6H · pith_short_16: BIIUEOXFHH6HVBZO · pith_short_8: BIIUEOXF

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/BIIUEOXFHH6HVBZOMYR4U2DJDD \
  | 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: 0a11423ae539fc7a872e6623ca686918f1066a7076c6347d779ca9700375a653

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "21ebfe7869f64e106d158b3378dd2aa8535f759afa3372d5e8ee6668ecc50c89",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2017-04-10T11:07:59Z",
    "title_canon_sha256": "da3273fed892d230c7f2544d6059932204e79fca4cc65e5f6c0204bcf36810d2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1704.02803",
    "kind": "arxiv",
    "version": 1
  }
}