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 (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 { }, Chainlink can help to establish communication between external API with multiple  blockchains but for now, it only supports Ethereum blockchain { }, the point of concern about Chainlink that Chainlink created on the Ethereum blockchain so the user can face a problem in scalability { } { }. API Reference Reference Reference-1 Reference-2 Interoperability by Cosmos: Cosmos is (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 (Inter-blockchain Communication Protocol Architecture) and Cosmos can communicate to other blockchains like Ethereum and zcash by using " ". PoS IBC 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 (the coin of cosmos blockchain) to Ethereum blockchain then it will lock up your ATOM coins and create the same amount of tokens which can transmit through Ethereum blockchain and all these process completed through IBC and Cosmos Peg. ATOM ERC20 Interoperability by Wanchain: Wanchain is focusing on financial industries, and it can communicate to other blockchains for the financial cross-chain transaction for example if you want to send some money (in the form of WAN coins) from your Wanchain wallet to your friend but your friend has Ethereum wallet then the WAN coin you send get locked by Locked Account Management node and the same amount of Ethereum coins get send to your friend's Ethereum wallet with a smart contract which will make sure that only your friend has redeemed that money and Wanchain can store all both on-chain or cross-chain transaction records { }. Reference Wanchain's vision to create an open-chain, financial system that can help to create cross-chain dapps, cross-chain mobile payment, decentralized exchange, decentralized financial applications. Interoperability by Polkadot: Polkadot is an open-source platform founded by and Co-founded by (Ex CTO of Ethereum who created Solidity language). Polkadot is claiming to give true Interoperability not only for financial transactions but also for computation and data transfer. Polkadot is a blockchain of many chains, but the main four components of Polkadot which are helping Polkadot for interoperability are "Relay Chain", "Parachains", "Parathreads" and "Bridge" { }. Web3 Foundation Dr. Gavin Wood Reference Without going technical, I'm just giving you an idea of what is Relay Chain, Parachains, Parathreads and Bridge; Relay chain- This is a major component of Polkadot which is responsible for the network’s shared security, consensus, and cross-chain interoperability, Parachains- These are the independent blockchains in the Polkadot have their own token and they can optimize themselves according to their uses, Parathreads- These are like parachains but run on pay-as-you-go model which need not be continuously connection to the network so this is more economical for blockchain. Bridge- This is the connecting link between parachains and parathreads to the external networks like Ethereum and bitcoin. ? What benefits we can get because of blockchain interoperability Let's start with some examples if your PayPal account can't able to communicate your bank account then just imagine what problems you may face ! same like that if multiple blockchains communicate with each other then many benefits an end user can get like followings. Smoothly transactions of data, money across multiple blockchains with no third party exchange or company. Smart contracts can executed very easily and effectively. Sharing of solution and innovation between two blockchains. Standardization of blockchain which can open to adoption. So yes blockchain interoperability is really matters because there are so many blockchains in exiting and many more kinds of blockchains yet to come, and we need a decentralized way to communicate with them without a third-party  which not only saves our time and efforts but also keep us safe. Conclusion: The conclusion part is my opinion which writes after my research during the article writing and according to me Polkadot is the best blockchain which can give true blockchain interoperability in every aspect of data, financial transaction, and computation where other projects like Cosmos and Wanchain mainly focused on financial transactions only. The team of Polkadot is huge and strong that backed by the web3 foundation and my trust grew towards Polkadot is because of Dr. Gavin wood he has already an excellent track record because of him we know the solidity language and smart-contract.

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What Is True Blockchain Interoperability?

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