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Etch is the hosted compliance layer around world-model-mcp, the open-source memory server it wraps. The OSS core is MIT-licensed and ships everything you need to run locally. Etch adds KMS-backed keys, a public transparency log, subscription billing, and an operator dashboard.

Open-source core

• pip install world-model-mcp, the OSS Python server
• npm i world-model-mcp, the TypeScript SDK
• Set WORLD_MODEL_AUDIT_LOG=on to enable the signed audit chain locally

Etch (hosted)

• KMS-encrypted signing keys, plaintext never at rest
• Public transparency log with signed head (split-view resistance)
• Scoped tokens: application, auditor, operator (segregation of duties)
• Stripe billing + subscription state machine
• Operator dashboard for rotate + sweep actions

Auditor tooling

Install etch-verify and run it against any Etch project. The verifier walks the transparency log, checks each chain hash, and verifies the hybrid Ed25519 + SLH-DSA signature on the head. No network access to Etch required after the initial download, supports air-gapped audit.

Ready to integrate?

10-minute quickstart→