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Quick Facts

• Sovereign Rollups have full autonomy to define their own state and execution environment, using Logos Blockchain only for consensus and data availability.
• Rollup data is posted as LogosDA blobs, with commitments written on-chain for Cryptarchia consensus benefits.
• Optimal for applications requiring speed and customisation over interoperability, such as gaming, digital nations, and private financial systems. </aside>

In its initial version, the Logos Blockchain is intended to support Sovereign Rollups - the most customisable, performant solutions for applications built on Logos. Sovereign Rollups have complete freedom to define their own state, only using the Logos Blockchain to ensure consensus and the availability of rollup data. This design allows applications built on Sovereign Rollups to have low fees and maximum scalability. While the Logos Blockchain is designed to eventually support permissionless and interoperable Zones with minimal setup required, this support remains a work in progress and is slated for inclusion in later versions of the protocol.

Overview

The idea behind Sovereign Rollups is to make performant applications with the freedom to define an execution environment to suit their needs, with the Logos Blockchain providing economic security and data availability guarantees that the rollup alone could not provide, helping to bootstrap rollups’ economic security. To ensure the correctness of the rollup state, Sovereign Rollups are left to their own devices instead of relying on a smart contract on the L1 as with Ethereum L2s. This could be done in any number of ways - including publishing ZK validity proofs to be verified by its validators, providing a challenge window for fraud proofs, or by requiring rollup nodes to re-execute the state transition function.

Bedrock does not attempt to interpret rollup data, only providing operations via Mantle to allow rollups to temporarily post data in the form of a LogosDA blob. This blob is distributed among DA nodes, allowing all Logos Light Nodes to verify its availability. The blob commitments are written on-chain, ensuring that the rollup state enjoys the benefits of Cryptarchia consensus.

One example of a Sovereign Rollup that uses validity proofs to verify its state.

The Sovereign Rollup depicted above has a sequencer that processes transactions from clients and sends the batched state data to LogosDA, while simultaneously creating ZK proofs for its state updates and distributing them off-chain. Rollup light nodes can then verify the proofs received from the sequencer and check the availability of the data via data availability sampling.

Use Cases

Sovereign Rollups can implement almost anything, ranging from applications to virtual machines that are home to many different applications. They are best suited for applications that require high performance and do not need strong interoperability. Some examples include:

• Self-Sovereign Digital Nations/Communities: In its capacity as a blockchain infrastructure for network states, Logos can power the core identity, communication, and governance layers for nascent digital nations. This would involve:
  • Self-Sovereign Identity (SSI) Solutions: Users can control their digital identities and share verifiable credentials privately and selectively.
  • Secure Communication Channels: The Logos ecosystem provides encrypted and censorship-resistant collaboration tools for citizens of network states.
  • Decentralised Justice Systems: Building frameworks for dispute resolution and legal agreements within a network state, potentially leveraging zero-knowledge proofs for privacy.
• Private DeFi Systems: With support for privacy built-in, Logos could host DeFi protocols where transaction details, user balances, or trading strategies are kept confidential by default, only revealing necessary information to authorised parties. This is especially so when high volumes of transactions are expected by these applications. Examples may include:
  • Private Exchanges: Trading platforms where order books or individual trades are obscured.
  • Confidential Lending/Borrowing Protocols: Financial services where loan details or collateral information are private.
  • Confidential Transfers: Securely sending and receiving digital assets with transaction details obscured using zero-knowledge proofs, ensuring financial privacy for individuals and businesses.
• Gaming Applications: Games often rely on rapid state changes to function correctly, making them ideal for implementation as Sovereign Rollup applications on Logos.