The Caldera project is revolutionizing blockchain scalability and interoperability with two key innovations: the Metalayer and the Rollup Engine. Together, these tools address the issues of scalability, seamless communication, and customization for decentralized applications on Ethereum.

1. The Metalayer: 

The Metalayer is an interoperability network that connects different blockchains, allowing them to communicate, share data, and transfer assets. It works through three main components:

- Execution Layer
- Settlement Layer
- Developer Toolkit

The goal is to create a network where new rollups are automatically integrated, giving users instant access to liquidity and assets across chains.

2. The Rollup Engine:

The Rollup Engine allows developers to create, manage, and scale rollups. Key features include:

- Programmable Infrastructure
- Dynamic Management
- Ease of Use

This enables developers to create specialized rollups for various applications, while users can transact seamlessly across these rollups