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How can I represent the this string "\x19Ethereum Signed Message:\n32" in java? The first character seems the length of 'Ethereum Signed Message:\n' string but it is escaped.

What I'm trying to do is to get the same sha3 hash for a given string using web3.sha3() and Web3j Hash.sha3() with the above prefix.

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You can represent that in Java as "\u0019Ethereum Signed Message:\n32".

And I think I was trying to do the same thing as you are with handling web3 signed messages in web3j, you can see how I got that working here: https://github.com/web3j/web3j/issues/222

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