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Why bitcoin addresses in testnet are not the same as in mainnet? For example ethereum address in mainnet can be used in testnet's (ropsten, rinkeby).

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Because using the same addresses for both is an enormous footgun. People could accidentally send funds on the wrong chain.

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  • sounds counterintuitive. had the same address been used on both "chains", it would be a simple 1:1
    – user610620
    Dec 9, 2022 at 5:00

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