Architecture
Nucleo's infrastructure is built using the following components:
- Satellite Contracts: A set of smart contracts deployed to each chain that act as a gateway for the User to interact with applications built on Nucleo.
- Application Contracts: A set of smart contracts deployed to each chain that can handle the creation of a new intent, and move tokens upon the successful execution of an intent.
- Task Executors: A network of nodes responsible for executing user intents as defined by the application.
- Execution AVS: An AVS built on EigenLayer that secures the execution of user intents by delegating restaked ETH from delegators to the task executors.
- Task Gateway: A trustless gateway that forwards user intents published by the Satellite Contracts to the Task Executors.
As the core nodes responsible for executing intents and agreeing on the cross-chain application state, the task executors maintain a local copy of the state of each application built on Nucleo. New executors can join the network at any time by syncing from the genesis point of Nucleo and registering themselves as an Operator on the AVS. In the event of malicious behaviour, these operators can be slashed and penalized.
User Workflow
A high level example of how a user would interact with an application built on Nucleo:
- User initiates an action by interacting with a Satellite Contract on their preferred chain
- Application Contract on source chain performs any pre-actions it needs to (e.g. transferring tokens from user to contract)
- Task Gateway receives the intent and forwards it to the Task Executors network
- Task Executors individually execute the intent and send back the results of the execution to the Task Gateway
- Task Gateway aggregates the results from all executors, and if consensus is reached, publishes the result to the Satellite Contract on the destination chain (same, or different, from the source chain)
- Application Contract on destination chain performs any post-actions it needs to (e.g. transferring tokens from contract to user)
- Intent is considered completed