If you are in the crypto world, then the word “blockchain interoperability” may familiar to you because there are so many projects are gaining publicity and funds from investors by using this term, and many projects like Chainlink, Cosmos, Polkadot, and Wanchain are claiming to give true blockchain interoperability. So in this article, we will discuss about these projects and try to understand what kind of blockchain interoperability they are giving and what benefits we can get because of blockchain interoperability?

Before start, this article I want to tell you the meaning of blockchain interoperability in brief: Blockchain interoperability enables two blockchains to communicate with each other and to do cross-chain transactions without depending on a third party {Reference}.

So let’s discuss about some existing projects which are claiming to give blockchain interoperability and in the end I will give my own view and try to find out which project is best to give interoperability.

Interoperability by Chainlink:

80% smart contract needs real-life data that created with a centralized system and a centralized system can’t directly get connected to a decentralized system, it needs a plugin and Chainlink is creating that plugin which can help to link an external API to a blockchain with smart contract. So you can say Chainlink help to implement a smart contract based payment/data transfer between a centralized system and blockchain with no change in its moral of the centralized system.

Here, the interoperability happens between external API(application program interface) with blockchain but using Chainlink two blockchain can’t communicate for example Bitcoin blockchain can’t communicate with Ethereum blockchain using Chainlink {Reference}, Chainlink can help to establish communication between external API with multiple blockchains but for now, it only supports Ethereum blockchain {Reference}, the point of concern about Chainlink that Chainlink created on the Ethereum blockchain so the user can face a problem in scalability {Reference-1} {Reference-2}.

Interoperability by Cosmos:

Cosmos is PoS (Proof of Stake) blockchain, which created to solve scalability and interoperability problems. Cosmos can help you create independent blockchains called “Zones” and each zone can communicate to the hub and each other using IBC (Inter-blockchain Communication Protocol Architecture) and Cosmos can communicate to other blockchains like Ethereum and zcash by using “Peg Zones”.

With the interoperability feature of Cosmos, it wants to power up the financial transactions between two blockchains for example when you want to send ATOM (the coin of cosmos blockchain) to Ethereum blockchain then it will lock up your ATOM coins and create the same amount of ERC20 tokens which can transmit through Ethereum blockchain and all these process completed through IBC and Cosmos Peg.

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