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Explaining Cross-Chain Interoperability 

Explaining Cross-Chain Interoperability  image 0
What is Cross-Chain Interoperability? 

Interoperability is a critical feature of blockchains that enables seamless data exchange between different chains. In the context of blockchain technology, cross-chain interoperability enables smart contracts to communicate with each other without the need to transfer tokens between different blockchains. By facilitating the exchange of assets, services, and transactions, blockchains can provide a comprehensive record of activities and transactions across multiple platforms.

In practice, interoperability solutions enable various blockchain applications to function effectively, irrespective of their underlying blockchain technology. For instance, the documentation of activities recorded on one blockchain can be replicated on another blockchain by utilizing the appropriate interoperability protocols. As a result, the functionality of blockchain applications is independent of the specific blockchain technology, making it possible for them to interact with any asset or service, regardless of the blockchain on which they are hosted. Be it DeFi protocols like DEXes and their associated liquidity pools, or NFT marketplaces and SocialFi platforms, cross-chain interoperability is essential in serving as a much needed convergence point to bring more users onto the same page. 

The Problem with Isolation 

Blockchains today face a challenge similar to the early days of the internet, where many isolated ecosystems could not communicate with each other. Twenty years ago, the primary means of online communication was limited to early email or basic message boards. Businesses could only engage with consumers through text advertisements or pop-ups on search directories like Yahoo. It was not until 1997 where two Standford PhD students developed an algorithm that assessed the significance of a website based on the frequency with which other websites linked to it. This algorithm, known as PageRank, led the company to adopt a new name, Google, and sparked the initial phase of technological advancements that transformed the internet into its modern form.

The lack of interoperability and connectivity hinders the widespread adoption of blockchain technology as it prevents the seamless flow of data and value across different networks. A simple analogy to understand this concept would be to think of different blockchains as separate islands with their own independent ecosystems. Without a means of connecting the two islands together, there would be no further interaction between these ecosystems. This by no means suggests that these "islands" may not continue to subsist on their own-they most certainly will. However, this prevents users from gaining access to different niche advantages offered by the different ecosystems that these "islands" play host to. 

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

As a user, the multi-deployment approach can present several challenges, including the inability to seamlessly transfer tokens from one blockchain to another. To accomplish this transfer, the assets must be destroyed on the source blockchain and then minted again on the destination blockchain using a third-party bridge, which can be time-consuming and confusing. This process leads to fragmented data islands and a suboptimal user experience. Additionally, holding assets across multiple blockchains increases security risks and exposes users to potential hacks and loss of funds.

Advantages of Cross-Chain Interoperability

The advantages of blockchain interoperability are evident, as it enables users to conduct transactions across multiple blockchain networks without relying on centralized intermediaries. It can also minimize fragmentation, enhance interoperability within the broader blockchain ecosystem, and create new business opportunities and models.

Removing Middlemen from the Equation 

Cross-chain interoperability allows users to conduct transactions across multiple blockchain networks without relying on centralized intermediaries. This reduces the need for middlemen, such as banks or payment processors, and enables direct peer-to-peer transactions. This not only increases the efficiency of transactions but also promotes decentralization, which is a fundamental principle of blockchain technology.

Minimizing Fragmentation 

Cross-chain interoperability also helps to minimize fragmentation within the blockchain ecosystem. Currently, there are numerous blockchain networks, each with their own protocols, features, and capabilities. This fragmentation can create silos, which limit communication and interoperability between different blockchain networks. Cross-chain interoperability solutions allow for the transfer of data and value between different blockchain networks, ultimately creating a more connected and cohesive ecosystem.

Fostering Greater Opportunities for Collaboration and Innovation 

Finally, cross-chain interoperability enhances interoperability within the broader blockchain ecosystem. This can facilitate the development of cross-chain decentralized applications, which can operate across multiple blockchain networks. This promotes collaboration and innovation between different blockchain networks, ultimately creating new and innovative business opportunities and models.

Drawbacks of Cross-Chain Interoperability Solutions 

However, there are certain limitations to these solutions. Various blockchains may have distinct security measures, consensus algorithms, and programming languages, which can contribute to technical complexity. For instance, while StarkNet offers a diverse and promising ecosystem, it requires developers to rewrite their existing projects in Cairo, the primary programming language used for the L2 rollup. Recently, however, StarkNet has attempted to ease this transition by rolling out Cairo 1.0, an updated version of Cairo that emulates Rust, a popular programming language used by developers with general coding experience. 

On the other hand, zkSync Era, otherwise initially known as simply zkSync 2.0, allows developers to recompile their smart contracts or L1 applications that used programming language such as Viper and Solidity into the L2 execution environment without any change to the base code. 

While blockchains are already taking extra precautions to facilitate multi-chain interoperability, these technical challenges require careful consideration and thoughtful design to ensure that blockchain interoperability is implemented effectively and securely. 

Various types of Cross-Chain Interoperability Solutions 

As the ecosystem grows, there is a need for improved cross-chain interoperability to facilitate seamless data and value transfers across various networks. The development of solutions for this issue has become a priority for many, unlocking new possibilities for more user-friendly and interconnected blockchain applications.

Various approaches have been proposed to improve cross-chain interoperability, with each solution having its unique features and benefits. In the following sections, we will discuss some examples of cross-chain interoperability solutions that showcase a wide array of approaches.


Wormhole is a blockchain interoperability protocol that facilitates the transfer of tokens and messages across different blockchain networks. It operates through a network of guardians who observe messages on a source chain and verify and facilitate transfers to target chains. Wormhole enables developers to build cross-chain decentralized applications, known as xDapps, that operate across multiple blockchain networks. These applications can utilize the protocol to transfer tokens and messages between different chains, enabling the creation of a more interconnected and efficient blockchain ecosystem.


LayerZero is another interoperability protocol that allows for lightweight message passing between different blockchain networks. The protocol provides secure and reliable message delivery with configurable trustlessness. LayerZero's ultra-light nodes (ULN) are smart contracts that provide block headers of other bridged chains to improve efficiency. These smart contracts are triggered on-demand and communicate with an oracle and a relayer through the LayerZero endpoint. This design enables lightweight and efficient cross-chain communication, making it easier for developers to build cross-chain decentralized applications that operate across multiple blockchain networks.


Axelar is a blockchain interoperability solution that uses the General Message Passing protocol to enable cross-chain communication. It allows developers to build decentralized applications that can operate across different blockchain networks. Axelar also provides secure interchain communication through delegated proof of stake (dPoS) for users bridging tokens. The protocol's bridging app, Satellite, connects the Ethereum-based BUSD to Cosmos, enabling interoperability between the two ecosystems. This solution makes it easier for developers to create cross-chain decentralized applications that can operate efficiently and securely across multiple blockchain networks, enhancing the overall functionality of the blockchain ecosystem.

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Ultimately, the Web3 space is indeed a cornucopia of limitless potential, opportunities, and innovation - and multi-chain interoperability is to key to bringing yourself closer to this trove of possibilities. The potential benefits of cross-chain interoperability solutions are significant, as they enable communication, data, and value transfers between different blockchain networks, consequently improving their efficiency and functionality. 

The future of cross-chain interoperability is expected to be a catalyst for increased collaboration between different blockchain networks and the development of novel blockchain applications. 

This will (hopefully) eventually lead to a more connected and user-friendly ecosystem that can unlock previously untapped potential for blockchain technology.