Quote from: nevafuse on April 30, 2013, 02:20:06 PM

Save http://brainwallet.org source to an html file on your flash drive w/ some linux live boot distro. While still online go to the "transactions" section, enter your source address to get your previous transaction history (click "edit inputs" and save to txt file on flash drive).

Boot live distro on your cold storage machine. Open brainwallet html in firefox & go to the "transaction section". Copy in transaction history from your txt file. Copy in your private key (use bitcoind to get key from wallet.dat if necessary). Copy destination address and the amount. I'd recommend specifying a destination address for the remainder (to avoid accidentally giving some miner a huge fee). I believe you can use the same address for the remainder as the source if you want. Brainwallet may default to this, but I'm not 100% sure. Hit re-sign if necessary to produce a raw transaction. Save that raw transaction back to your txt file.

Now you can copy that raw transaction into http://blockchain.info/pushtx or bitcoind to send the transaction without the online computer ever seeing your private key.

PLEASE TRY THIS WITH A SMALL AMOUNT FIRST. VERY EASY TO ACCIDENTALLY SEND A LOT OF MONEY TO THE WRONG PERSON - LIKE A MINER. GOOD LUCK.

Thanks for the suggestion. Is it possible to play with the brainwallet on the testnet? I have taken a look on it before. The issue is that the functionality of brainwallet is very simple and it seems not support sendtomany() now. Sure I can first send it to standard wallet and then create another transaction, but it takes an hour and increase the error.

The standard client have commands for all type of transactions, that is why I want to know whether the scheme described works or not?