"Polkadot and Cosmos: The Interoperability Leaders"
Blockchains today are like isolated islands, which are great in themselves but can't communicate with others.
Blockchains are great databases, but they are dumb at communicating with each other and lack interoperability.
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To transfer assets across chains, we have to use bridges, which come with inherent risks. According to @Cointelegraph more than $2.5 billion worth of assets have been lost in bridge hacks.
To solve this serious problem, developers around the world are building robust solutions.