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### personal_sign
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### personal_sign
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The sign method calculates an Ethereum specific signature with:
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The sign method calculates an Ethereum specific signature with:
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`sign(keccak256("\x19Ethereum Signed Message:\n" + len(message) + message)))`.
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`sign(keccak256("\x19Ethereum Signed Message:\n" + len(message) + message))`.
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By adding a prefix to the message makes the calculated signature recognisable as an Ethereum specific signature. This prevents misuse where a malicious DApp can sign arbitrary data (e.g. transaction) and use the signature to impersonate the victim.
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By adding a prefix to the message makes the calculated signature recognisable as an Ethereum specific signature. This prevents misuse where a malicious DApp can sign arbitrary data (e.g. transaction) and use the signature to impersonate the victim.
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