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{"jsonrpc":"2.0","method":"eth_sign","params":["**", "0xdeadbeaf"],"id":1}

Here is an example

Ignoring the first parameter, what format is the second parameter?

{"jsonrpc":"2.0","method":"eth_sign","params":["**", "hello"],"id":1}

Should I convert "hello" to hex and concatenate 0x?

{"jsonrpc":"2.0","method":"eth_sign","params":["**", "0x68656c6c6f"],"id":1}

1 Answer 1

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According to the ethereum wiki, the second parameter is a keccak256 hash of the message, with the following format:

keccak256("\x19Ethereum Signed Message:\n" + len(message) + message)

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