Architecture

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System Architecture

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Component Responsibilities

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User’s EOA with EIP-7702 Proposer Code

• Contains the deployed proposer contract code (e.g., TrustlessProposer)
• Validates signatures and executes authorized transactions
• Signs transactions to be submitted to DA Builder

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DA Builder Service

• Accepts transaction submissions from users
• Validates EIP-7702 setup and account funding
• Collects multiple user transactions
• Creates aggregated EIP-4844 blob transactions
• Manages transaction ordering and batching
• Returns transaction IDs for tracking

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ProposerMulticall Contract

• Executes the aggregated transaction on-chain
• Calls each user’s proposer contract in sequence

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GasTank Contract

• Stores user deposits to cover their respective transaction fees
• Provides balance tracking

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L2 Rollup Inbox

• Receives the actual user transaction
• Processes it according to L2 protocol rules
• Updates L2 state based on transaction execution