Pith Number

pith:FXWA44DA

pith:2026:FXWA44DAYR43WCPXGJC2Q7LS3C

not attested not anchored not stored refs pending

From Craft to Kernel: A Governance-First Execution Architecture and Semantic ISA for Agentic Computers

Changran Xu, Fangxin Liu, Haomin Li, Jianrong Ding, Li Jiang, Lingjun Chen, Qiang Xu, Shu Chi, XiangYu Wen, Xiaoyu Xu, Yuang Zhao, Zeju Li

Arbiter-K enforces security as a microarchitectural property in agentic AI by reifying model outputs through a Semantic ISA into taint-tracked discrete instructions.

arxiv:2604.18652 v2 · 2026-04-20 · cs.CR · cs.AI

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\usepackage{pith}
\pithnumber{FXWA44DAYR43WCPXGJC2Q7LS3C}

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Record completeness

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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.

Claims

C1strongest claim

Arbiter-K enforces security as a microarchitectural property, achieving 76% to 95% unsafe interception for a 92.79% absolute gain over native policies.

C2weakest assumption

That probabilistic outputs from the underlying model can be reliably and losslessly reified into discrete instructions via the Semantic ISA without introducing new failure modes or missing critical context.

C3one line summary

Arbiter-K is a new execution architecture that treats LLMs as probabilistic processors inside a neuro-symbolic kernel with a semantic ISA to enable deterministic security enforcement and unsafe trajectory interdiction in agentic AI.

Receipt and verification

First computed	2026-05-20T00:05:44.991369Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2dec0e7060c479bb09f73245a87d72d8aa4f1179124286a310dcd3c401237150

Aliases

arxiv: 2604.18652 · arxiv_version: 2604.18652v2 · doi: 10.48550/arxiv.2604.18652 · pith_short_12: FXWA44DAYR43 · pith_short_16: FXWA44DAYR43WCPX · pith_short_8: FXWA44DA

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/FXWA44DAYR43WCPXGJC2Q7LS3C \
  | 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: 2dec0e7060c479bb09f73245a87d72d8aa4f1179124286a310dcd3c401237150

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "595d35fd5778c25595e3396dc7c3eb02abba0e803929cc9564cef0b52f168e1d",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CR",
    "submitted_at": "2026-04-20T05:25:37Z",
    "title_canon_sha256": "eea793466f8c2da9963e4560a55df1c40d0c02cf1bb3ac482221b24d32b23919"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.18652",
    "kind": "arxiv",
    "version": 2
  }
}