# NexArt

> NexArt provides deterministic execution verification infrastructure. Certified Execution Records (CERs) are cryptographically bound records of AI or deterministic execution that can be independently verified. NexArt supports both single-execution CERs and Project Bundles for multi-step or multi-agent workflows.

## Start here

- [What is NexArt](https://docs.nexart.io/docs/what-is-nexart)
- [Getting Started](https://docs.nexart.io/docs/getting-started)
- [Quickstart](https://docs.nexart.io/docs/quickstart)
- [Architecture](https://docs.nexart.io/docs/architecture)
- [FAQ](https://docs.nexart.io/docs/faq)
- [Examples](https://docs.nexart.io/docs/examples)
- [Guides](https://docs.nexart.io/docs/guides)
- [Certifying LLM Conversations](https://docs.nexart.io/docs/certifying-llm-conversations)

## Protocol

- [Protocol Overview](https://docs.nexart.io/docs/protocol-overview)
- [CER Protocol](https://docs.nexart.io/docs/cer-protocol)
- [CER Record Management](https://docs.nexart.io/docs/cer-record-management)
- [AI CER Package Format](https://docs.nexart.io/docs/ai-cer-package-format)
- [AI CER Verification Layers](https://docs.nexart.io/docs/ai-cer-verification-layers)
- [Trust Model](https://docs.nexart.io/docs/trust-model)
- [Attestation Node](https://docs.nexart.io/docs/attestation-node)
- [AIEF v0.2.5 Projection](https://docs.nexart.io/docs/aief)
- [Versions and Compatibility Baseline](https://docs.nexart.io/docs/versions)
- [Release Notes](https://docs.nexart.io/docs/release-notes)

## Concepts

- [Certified Execution Records](https://docs.nexart.io/docs/concepts/cer)
- [AI Execution V2 Record Schema](https://docs.nexart.io/docs/ai-execution-v2)
- [V1 / V2 Compatibility Matrix](https://docs.nexart.io/docs/v1-v2-compatibility)
- [Migrating from V1 to V2](https://docs.nexart.io/docs/migration-v1-to-v2)
- [Glossary](https://docs.nexart.io/docs/glossary)
- [Project Bundles](https://docs.nexart.io/docs/concepts/project-bundles)
- [Hashes (certificateHash, projectHash)](https://docs.nexart.io/docs/concepts/hashes)
- [Signed Receipts](https://docs.nexart.io/docs/concepts/signed-receipts)
- [Hash-Only Timestamping](https://docs.nexart.io/docs/concepts/hash-timestamping)
- [Verification Reports](https://docs.nexart.io/docs/concepts/verification-reports)
- [Context Signals](https://docs.nexart.io/docs/concepts/context-signals)
- [Execution Context and Signals](https://docs.nexart.io/docs/concepts/execution-context)

## SDKs and Tools

- [AI Execution SDK](https://docs.nexart.io/docs/sdk)
- [Policy SDK](https://docs.nexart.io/docs/policy-sdk)

  Core SDK functions (framework-agnostic, canonical):
  - `certifyDecision(params)` — sync. Returns a sealed `CerAiExecutionBundle`. No network call.
  - `certifyDecisionFromProviderCall(params)` — sync. Builds a CER from a raw provider request+response.
  - `sealCer(snapshot, options?)` — sync. Lower-level: seals a pre-built `AiExecutionSnapshotV1`.
  - `attest(bundle, options)` — async. Submits a sealed bundle to the attestation node. Returns `AttestationResult` (`ok`, `certificateHash`, `attestationId`, `nodeRuntimeHash`, `protocolVersion`).
  - `certifyAndAttestDecision(params, options)` — async. One-call seal + attest. Returns `{ bundle, receipt }` where `receipt` is an `AttestationReceipt`.
  - `verifyAiCerBundleDetailed(bundle)` — async. Returns Layer 1/2/3 verification report.

  Required `CertifyDecisionParams` fields: `provider`, `model`, `prompt`, `input`, `parameters`, `output`. `prompt` and `parameters` are REQUIRED, not optional. `parameters` MUST be a full `AiExecutionParameters` object with all four keys present: `temperature: number`, `maxTokens: number`, `topP: number | null`, `seed: number | null`. `topP` and `seed` accept `null` but the keys MUST be set. A partial object like `{ temperature: 0 }` will not type-check.

  Note: `certifyDecision` in `@nexart/ai-execution` is synchronous. `certifyDecision` exposed by `@nexart/agent-kit` is asynchronous (it dispatches through the workflow runner). The two are not interchangeable.

  Optional adapters:
  - `createLangChainCer(...)`, `certifyLangChainRun(...)` from `@nexart/ai-execution/langchain` — thin DTO adapters over `certifyDecision` / `certifyAndAttestDecision`. Use these only when you have data already shaped as LangChain inputs (e.g., from a LangChain callback). For raw OpenAI SDK, Anthropic SDK, or any other framework, use `certifyDecision` directly.
- [Signals SDK](https://docs.nexart.io/docs/signals-sdk)
- [NexArt CLI](https://docs.nexart.io/docs/cli)
- [CodeMode SDK](https://docs.nexart.io/docs/codemode-sdk)
- [UI Renderer SDK](https://docs.nexart.io/docs/ui-renderer-sdk)
- [Agent Kit](https://docs.nexart.io/docs/agent-kit)
- [Agent-Kit Instructions for AI Agents](https://docs.nexart.io/docs/agent-kit-instructions) — paste-ready runbook ([raw markdown](https://docs.nexart.io/agent-kit-instructions.md))
- [Confidential Execution Mode](https://docs.nexart.io/docs/confidential-mode)
- [Python Bridge](https://docs.nexart.io/docs/python-bridge)
- [Key Management](https://docs.nexart.io/docs/security/key-management)
- [Builder Integration Guide](https://docs.nexart.io/docs/builder-integration-guide)
- [Integration Surfaces](https://docs.nexart.io/docs/integration-surfaces)

## Workflows

- [End-to-End Verification Flow](https://docs.nexart.io/docs/end-to-end-verification)
- [AI Execution CER](https://docs.nexart.io/docs/ai-execution)
- [Project Bundle Registration](https://docs.nexart.io/docs/project-bundle-registration)
- [Multi-step & Multi-agent Workflows](https://docs.nexart.io/docs/multi-step-and-multi-agent-workflows)
- [Public Reseals & Redacted Verification](https://docs.nexart.io/docs/public-reseals-and-redacted-verification)
- [CER Audit Workflows](https://docs.nexart.io/docs/cer-audit-workflows)

## Verification

- [Verification](https://docs.nexart.io/docs/verification)
- [Verification Model](https://docs.nexart.io/docs/verification-model)
- [Verification Semantics](https://docs.nexart.io/docs/verification-semantics)
- [Verification Statuses & Errors](https://docs.nexart.io/docs/verification-statuses-and-errors)
- [Independent Verification](https://docs.nexart.io/docs/independent-verification)
- [External Verification](https://docs.nexart.io/docs/external-verification)
- [verify.nexart.io](https://docs.nexart.io/docs/verify-nexart)
- [Browser Verification](https://docs.nexart.io/docs/browser-verification)

## Integrations

- [Integrations Overview](https://docs.nexart.io/docs/integrations)
- [n8n](https://docs.nexart.io/docs/integrations/n8n)
- [LangChain](https://docs.nexart.io/docs/integrations/langchain)

## Dashboard

- [Projects](https://docs.nexart.io/docs/dashboard/projects)
- [Apps](https://docs.nexart.io/docs/dashboard/apps)
- [Auto-Stamp](https://docs.nexart.io/docs/dashboard/auto-stamp)
- [Retention](https://docs.nexart.io/docs/dashboard/retention)
- [Audit Exports](https://docs.nexart.io/docs/dashboard/audit-exports)
- [Privacy & Data Handling](https://docs.nexart.io/docs/privacy)

## Evidence Bridge

- [Evidence Bridge](https://docs.nexart.io/docs/evidence-bridge)
- [How Evidence Bridge Works](https://docs.nexart.io/docs/evidence-bridge/how-it-works)
- [Mapping Profiles and Transforms](https://docs.nexart.io/docs/evidence-bridge/mapping-profiles)
- [Map Existing JSON to Verifiable AI Evidence](https://docs.nexart.io/docs/evidence-bridge/ai-execution)
- [Operational Execution & Consequential Execution V1](https://docs.nexart.io/docs/evidence-bridge/operational-execution)
- [Custom JSON Evidence Mapping](https://docs.nexart.io/docs/evidence-bridge/custom-json)
- [Evidence Bridge Authentication](https://docs.nexart.io/docs/evidence-bridge/authentication)
- [Confidential Execution Evidence](https://docs.nexart.io/docs/evidence-bridge/confidential-evidence)
- [NexArt Attestation & Verification](https://docs.nexart.io/docs/evidence-bridge/attestation)
- [Evidence Bridge Integration Guide](https://docs.nexart.io/docs/evidence-bridge/integration-guide)
- [Evidence Bridge Security & Trust Boundaries](https://docs.nexart.io/docs/evidence-bridge/security)

## Optional

- [Full text of all pages, part 1](https://docs.nexart.io/llms-full.txt) (paginated: each part links to the next)
- [Full text part index](https://docs.nexart.io/llms-full.txt?parts) (lists every part and every single-page markdown URL)
- Any page is also available as markdown at https://docs.nexart.io/md/<path>.md, e.g. https://docs.nexart.io/md/docs/faq.md

## Links

- Main site: https://nexart.io
- Verification portal: https://verify.nexart.io
- Documentation: https://docs.nexart.io