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Clarify eth.personal.sign docs #3091

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Oct 8, 2019
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Clarify eth.personal.sign docs #3091

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17 changes: 16 additions & 1 deletion docs/web3-eth-personal.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,17 @@ sign

web3.eth.personal.sign(dataToSign, address, password [, callback])

Signs data using a specific account.
The sign method calculates an Ethereum specific signature with:

.. code-block:: javascript

sign(keccak256("\x19Ethereum Signed Message:\n" + dataToSign.length + dataToSign)))

Adding a prefix to the message makes the calculated signature recognisable as an Ethereum specific signature.

If you have the original message and the signed message, you can discover the signing account address
using :ref:`web3.eth.personal.ecRecover <eth-personal-ecRecover>` (See example below)


.. note:: Sending your account password over an unsecured HTTP RPC connection is highly unsecure.

Expand Down Expand Up @@ -119,6 +129,11 @@ Example
.then(console.log);
> "0x30755ed65396facf86c53e6217c52b4daebe72aa4941d89635409de4c9c7f9466d4e9aaec7977f05e923889b33c0d0dd27d7226b6e6f56ce737465c5cfd04be400"

// recover the signing account address using original message and signed message
web3.eth.personal.ecRecover("Hello world", "0x30755ed65396...etc...")
.then(console.log);
> "0x11f4d0A3c12e86B4b5F39B213F7E19D048276DAe"


------------------------------------------------------------------------------

Expand Down