Pith Number

pith:Y4JVMWGG

pith:2025:Y4JVMWGG7R7OL3YI5ZP434XLLR

not attested not anchored not stored refs pending

FreeTalk:A plug-and-play and black-box defense against speech synthesis attacks

Chunqiang Hu, Chunyi Zhou, Haibo Hu, Jiahao Chen, Shouling Ji, Yuwen Pu, Zhou Feng

arxiv:2509.00561 v1 · 2025-08-30 · 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{Y4JVMWGG7R7OL3YI5ZP434XLLR}

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	2026-07-05T12:02:18.485388Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c7135658c6fc7ee5ef08ee5fcdf2eb5c7d5b66a1d679487a22d35e88044a25c4

Aliases

arxiv: 2509.00561 · arxiv_version: 2509.00561v1 · doi: 10.48550/arxiv.2509.00561 · pith_short_12: Y4JVMWGG7R7O · pith_short_16: Y4JVMWGG7R7OL3YI · pith_short_8: Y4JVMWGG

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/Y4JVMWGG7R7OL3YI5ZP434XLLR \
  | 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: c7135658c6fc7ee5ef08ee5fcdf2eb5c7d5b66a1d679487a22d35e88044a25c4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cab7e036887407825dca697a4dfeeef9f7d21793287819ce9ecc35c565c2a6c0",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2025-08-30T17:10:22Z",
    "title_canon_sha256": "eef133deb133142611f11c9c7bafc480facc2f695fa37cf24524fc00bc3b1a4f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2509.00561",
    "kind": "arxiv",
    "version": 1
  }
}