Build Offchain-x-Onchain Systems with Compose

Compose is the offchain-to-onchain framework for high-stakes systems. It lets you write code that durably moves money, data, and events between every platform you use, whether it’s offchain or onchain. Write simple TypeScript code that runs in verifiable sandboxes, with auditable datastores and traceable functions. Monitor the input and output of every mutation in production, and use TEE-powered attestations to prove that your logic actually ran as intended.

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What you’ll find here

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Use cases

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How it works

Every Compose app can have multiple tasks, which can be triggered through on-chain events, cron-like scheduling, or an API. Tasks run in auditable sandboxes with immutable tracing on every function call that touches the external world. State is versioned and tracked, and execution persists through downtime.

• Ultracompliance: Write your code in your local environment, and run exactly the same code in our cloud environment or in a Trusted Executable Environment (TEE).
• Actually useful sandboxes: Task code runs in a sandbox, but can call safe functions that interact with the outside world.
• Trace everything: Every step of every task is traced. From the CLI or UI, step through any task execution down to individual function calls.

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Architecture

Compose executes tasks in auditable sandboxes that route all external communication through the Compose host, which handles durability and guaranteed execution. Every function call that mutates state (databases, blockchains) or accesses external resources is tracked, with inputs and outputs saved and viewable in the UI for tracing and debugging. The task sandbox is isolated and can run as a Trusted Executable Environment or as a normal container. The same code can be used in all environments. Code run in a TEE will also generate attestations, with guarantees that the code run is exactly the code you intend, with no side effects. Get started by setting up your first Compose application in under 5 minutes.