Pith Number

pith:J5PKE6RW

pith:2026:J5PKE6RW6RH76JNCORW23IKNO5

not attested not anchored not stored refs pending

Rendering on Real Silicon: GPU Render-Timing as a Passive, AI-Resistant CAPTCHA Signal

David Noever, Forrest McKee

arxiv:2607.23389 v1 · 2026-07-25 · cs.CR · cs.LG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{J5PKE6RW6RH76JNCORW23IKNO5}

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	2026-07-28T01:22:50.264631Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4f5ea27a36f44fff25a2746dada14d777ec94176098ac8a5c32aca9321762c41

Aliases

arxiv: 2607.23389 · arxiv_version: 2607.23389v1 · doi: 10.48550/arxiv.2607.23389 · pith_short_12: J5PKE6RW6RH7 · pith_short_16: J5PKE6RW6RH76JNC · pith_short_8: J5PKE6RW

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/J5PKE6RW6RH76JNCORW23IKNO5 \
  | 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: 4f5ea27a36f44fff25a2746dada14d777ec94176098ac8a5c32aca9321762c41

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7e9a16dfcdf1e65a27176b34041d7bf212973d532c494032c1e222ec0fa24e69",
    "cross_cats_sorted": [
      "cs.LG"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2026-07-25T23:10:24Z",
    "title_canon_sha256": "e718fc7bb3515118d4b19461956c8320da8b249381d6a15ae9c89380a0e264cf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.23389",
    "kind": "arxiv",
    "version": 1
  }
}