What is the Difference between WBTC and Btc?

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Wrapped Bitcoin is Bitcoin that is tokenized into the Ethereum blockchain or ERC-20. Wrapped Bitcoin is a representation of a smart contract where Bitcoin is locked as collateral so that users can transact on other blockchains. In terms of exchange rate or the amount guaranteed is 1:1, however, wrapped Bitcoin is not Bitcoin, of course there are many differences, so in your opinion, what are the differences between WBTC and BTC?