Sequencers

Sequencers play a crucial role in bridging the gap between the L1 (Dogecoin) blockchain and the L2 (Laika) network. They are responsible for batching transactions on L2, submitting them to the L1 blockchain for verification, and generating cryptographic proofs to ensure the data's availability on L1. This section dives into the functionalities and responsibilities of sequencers on Laika.

Responsibilities

Sequencers fulfill several key tasks in Laika's transaction processing pipeline:

• Transaction Batching: Sequencers aggregate multiple L2 transactions into batches to optimize transaction costs on the L1 blockchain.

• L1 Submission: Sequencers submit these transaction batches to the L1 blockchain (Dogecoin) for inclusion in a block.

• Data Availability Proofs: After submitting transactions to L1, sequencers generate cryptographic proofs (e.g., Merkle proofs) that demonstrate the data's availability on the L1 chain. These proofs are crucial for ensuring the verifiability of L2 transactions even if the original L1 transaction data is no longer readily available.

• Incentive Mechanisms: Sequencers will be incentivized through a reward structures in future to encourage efficient transaction processing and data availability guarantees.

Sequencer Selection

The approach for selecting sequencers on Laika is still under consideration (details to be confirmed in future documentation). Here are some potential approaches:

• Permissioned Sequencers (Initial Stage): In the initial stages, Laika will leverage a permissioned set of sequencers chosen based on their technical expertise and reliability.

• Permissionless Sequencers (Future Goal): Laika aims to transition towards a permissionless system where anyone can become a sequencer by staking Laika tokens. This would incentivize participation and contribute to network decentralization.

Security Considerations

Sequencers play a critical role in maintaining the integrity of the Laika network. Here are some security considerations:

• Fraudulent Sequencers: Malicious sequencers could attempt to submit invalid transactions or manipulate data availability proofs. Laika's design incorporate mechanisms to detect and penalize such behavior, each sequencer action is verified by multiple validators independently to make sure there is no mismatch.

• Data Availability Guarantees: The data availability proofs generated by sequencers are essential for ensuring long-term transaction verifiability. Due to L1 Dogechain being highly secured due to the vast amount of mining power behind Doge makes it highly unlikely of common consensus attacks like 51%. Furthermore to handle reorganizations each sequencer creates a UTXO chain which ensures data written to the L1 always remain in the intended sequence.

Importance of Sequencers

Efficient and reliable sequencer operations are vital for Laika's functionality. Sequencers enable seamless transaction processing between L1 and L2, ensure data verifiability, and contribute to the overall scalability of the Laika network.