This article is a contribution from the community. The content was written by Derek Yoo, CEO of PureStake, a team developing the Moonbeam platform for cross-chain applications.

The views expressed in this article are those of the contributor/author and do not necessarily reflect the views of Binance Academy.

In brief

Cross-chain interoperability allows applications to communicate and interact with each other across different blockchain networks. This enables the transfer of data and value between different systems, resulting in increased connectivity and seamless integration.

What is interoperability in blockchain?

Interoperability in the blockchain sector refers to the ability of one blockchain to freely exchange data with other blockchains. Cross-chain interoperability allows smart contracts on different chains to communicate with each other without having to send physical tokens between chains.

For example, assets, services, and transactions are recorded on the blockchain as documents. Any activity that takes place on one blockchain can be represented on another blockchain with the right interoperability solution. This means applications work with any asset or service regardless of which blockchain they are on.

Why is interoperability important?

Blockchain today is in a similar position to the early days of the Internet: there are many isolated ecosystems that cannot exchange information.

This lack of interoperability and connectivity poses a significant obstacle to broader adoption of blockchain technology, as it prevents the seamless flow of data and value across different networks.

From the developer's perspective, each deployment constitutes an isolated and independent instance, resulting in backend contracts that are unconnected and unaware of each other. For example, a decentralized exchange (DEX) DApp may need to be deployed on the individual Ethereum, BNB Chain, and Polygon networks. It leads to each version of these DApps being considered isolated.

As a user, the multi-site deployment approach can present some challenges. Specifically, this implementation does not allow for the seamless transfer of tokens from one blockchain to another. This is typically done in a process where assets are destroyed on the source blockchain and recast on the destination blockchain using a third-party bridge. This process can be time-consuming and confusing, leading to islands of fragmented data and poor user experiences. The security risks associated with holding assets on multiple blockchains can also be significant, opening the door to hacks and potential loss of funds.

Cross-chain interoperability solutions

Cross-chain connectivity is improving as developers build solutions that make it easier to connect and transfer data and value across different networks. This could unlock new possibilities for more user-friendly and interconnected blockchain applications.

There are many different approaches to improving interoperability between chains. Here, we list some examples to showcase a variety of solutions.

Chainlink is developing the Cross-Chain Interoperability Protocol (CCIP), which is an open source standard to enable cross-chain communication, including messaging and token transfers. The goal of CCIP is to enable universal connectivity between hundreds of blockchain networks using a standardized interface. It has the potential to reduce the complexity of building cross-chain applications and services.

Wormhole

The Wormhole Protocol is a general interoperability protocol that allows the transfer of tokens and messages between different blockchain networks. Messages on the source chain are observed by a network of guardians - people who verify and facilitate transfer to target chains. Developers using Wormhole can build cross-chain decentralized applications called xDapps.

LayerZero

LayerZero is a multi-chain interoperable protocol for lightweight message transfer between blockchains, providing secure and reliable messaging with configurable reliability.

LayerZero's ultra-lightweight nodes (ULNs) are smart contracts that feed the block headers of other bridge chains to improve efficiency. ULN is enabled only on demand, and the smart contract communicates with an oracle and a relay through the LayerZero endpoint. This design allows for lightweight and efficient cross-chain communication.

Hyperlane

Hyperlane is a validated proof of stake (PoS) chain protocol that secures cross-chain communication through configurable consensus methods. In Hyperlane's network, each validator is responsible for validating every chain to which Hyperlane is connected, ensuring that communication between chains is secure and accurate.

Inter-Blockchain Communication

Inter-Blockchain Communication (IBC) is the standard protocol for blockchain interaction in the Cosmos Network, designed to enable interoperability between different blockchains. IBC defines a minimum set of functionality specified in the Interchain Standards (ICS), which defines how blockchains can communicate and exchange data with each other.

One example is Osmosis - a DEX that allows users to swap tokens between different blockchains. Osmosis uses the IBC protocol to enable the seamless swapping of tokens from different chains, allowing token holders to directly benefit from the interoperability that IBC provides.

Avalanche Warp Messaging

Avalanche Warp Messaging (AWM) is designed to be flexible and allows developers to create their own messaging specifications to support communications. The AWM specification itself requires a byte array, indexing who has participated in BLS Multi-Signature and BLS Multi-Signature. AWM makes it easier for developers to build powerful DApps on the Avalanche network.

BTC Relay

BTC Relay is a relay chain deployed in a live environment. It allows sending Bitcoin block headers to Ethereum. By doing so, it provides a way to verify the inclusion of Bitcoin transactions on the Ethereum blockchain, creating a trusted bridge between the two networks.

Cross-Consensus Message Format

Cross-Consensus Message Format allows different consensus systems to communicate with each other on Polkadot. With the successful integration of XCM version 3, developers can build applications that enable bridges, cross-chain locking, exchanges, NFTs, conditions, context tracking, and more.

For example, the Moonbeam XCM SDK primarily supports XCM token transfers, allowing developers to interact with the Polkadot network using XCM.

Shoulders

Axelar provides a solution for cross-chain communication through the use of the General Message Passing protocol, allowing developers to build decentralized applications that can operate across multiple blockchain networks. Axelar also provides secure cross-chain communication through delegated PoS (dPoS) for users bridging tokens.

For example, Axelar's bridge application, Satellite, connects Ethereum-based BUSD to Cosmos, enabling interoperability between the two ecosystems.

Benefits and limitations of interoperability

The benefits of blockchain interoperability are clear. Users can potentially perform transactions across different blockchain networks seamlessly without the need for a centralized intermediary. It also reduces fragmentation, improves interoperability within the broader blockchain ecosystem, and opens up new business models and boundaries.

However, there are some limitations to these solutions. Different blockchains may have different security solutions, consensus algorithms, and programming languages, which can add technical complexity. These solutions have the potential to increase the probability of attacks and create new governance challenges between different blockchain networks.

summary

Cross-chain interoperability solutions have the potential to significantly improve the efficiency and functionality of blockchain networks by enabling communication, data, and value transfer between different networks.

The future development of cross-chain interoperability is expected to drive greater innovation between different blockchain networks and create new applications of blockchain. These could lead to a more user-friendly and connected blockchain ecosystem.

However, for widespread use, various cross-chain interoperability solutions need to achieve more stability and security. Currently, it is uncertain which solution will provide the most efficient, stable, and secure tools.

Read more:

  • What is a Blockchain Bridge?

  • What is Layer 0 in the Blockchain Field?

  • What is Layer 1 in Blockchain?

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