Keeper as Attester

An Attester Keeper acts as a validator, ensuring that tasks are executed correctly by verifying the execution proofs submitted by Performers. Instead of performing transactions, attesters observe, verify, and sign execution proofs to confirm the legitimacy of an action.

Responsibilities of an Attester Keeper:

• Observing Transactions: Listens to task execution events submitted by Performers.

• Validation of Execution: Checks whether the submitted transaction was executed correctly and meets all required conditions.

• Signature Generation: If valid, the keeper generates an attestation signature to confirm that the execution is legitimate.

• Proof Submission: The signed attestation is sent to the Aggregator node for final verification and submission.

• Fraud Detection: If a Performer submits incorrect or malicious execution data, Attesters can reject the attestation.

Workflow of an Attester Keeper:

1. Monitors the blockchain for task execution submissions from Performers.

2. Fetches the transaction data and validates it against the expected task details.

3. If valid, generate a digital signature confirming the correctness of execution.

4. Sends the signed attestation to the Aggregator for further processing.

Example Scenario:

• A Performer executes a limit order for a user on a decentralized exchange.

• The Attester Keeper checks whether the swap was performed at the correct price and in the right amount.

• If the execution is valid, the attester signs the proof and submits it.

• If invalid, the attester rejects the proof, ensuring that only correctly executed transactions are accepted.