Nexart

NexArt is an execution-evidence layer for developers and organizations that need verifiable proof of what an AI system, agent workflow, or deterministic code run actually executed.

Key capabilities include:

• Certified Execution Records (CERs) created via SDK to capture selected inputs, outputs, parameters, and execution context, then cryptographically seal them so tampering becomes detectable.
• Optional attestation through a NexArt node that checks and signs the record and can return a signed receipt (the site notes RFC 3161 timestamping via DigiCert’s public timestamp authority).
• Project Bundles to group multi-step executions, preserve ordering, and maintain cross-step integrity across an agent session or business process.
• Independent verification using the SDK, CLI, or the public verifier at https://verify.nexart.io, with no NexArt account required; commitment-only options can keep sensitive raw inputs or outputs out of the record.

Pricing: Freemium. Creating and verifying records is free; the Free plan includes 100 certified runs/month. Pro is $6,000/year (5,000 runs/month), Team $18,000/year (50,000 runs/month), Enterprise from $50,000/year.

What makes it notable: NexArt focuses on portable, independently verifiable execution evidence with clear trust boundaries (execute, certify, verify). It complements observability and logging, and it does not provide an AI agent runtime or judge whether an execution was correct.