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I would want to force bitcoind to include a specific transaction as an input of another transaction. This is so as to prevent people front wanting to launch a double-spend attack on the website. The method is similar to the one used by SatoshiDice. How can I accomplish this task with the standard client?
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This will be possible using the 'raw transaction interface' that was added recently and scheduled to be part of the 0.7.0 release.
With listunspent you can request a list of available coins sent to a particular (wallet) address, and with createrawtransaction you can build a transaction that consumes specified coins. Finally, sendrawtransaction can be used to broadcast a prepared raw transaction to the network.
1Any idea of when 0.7.0 will be released? – Sebastian Castro – 2012-08-29T04:57:20.747
0.7.0rc1 was released yesterday, so... soon. – Pieter Wuille – 2012-08-29T13:47:09.470