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From the "Yet another Coin Control Release [CLOSED]" BitcoinTalk thread: What is coin control? When you send bitcoins to someone else, the bitcoin client chooses kinda randomly which of your addresses will send the coins. With coin control you can exactly choose, which of your addresses will be the sending addresses. And even more specific which of your ...


9

As long as you're running a relatively recent version of Bitcoin Core you can use Coin Control. This feature let's you pick which unspent outputs will be used in the transaction. To enable Coin Control, go to Settings->Options->Wallet->'Enable coin control features'. Now in the Send window, you can click 'Inputs...' to select which unspent outputs you want ...


5

Bitcoin Core doesn't use an oldest-first selection but a more complex solver, it will probably end up spending outputs you don't want to in this particular case. You can do manual selection of the outputs you want to spend using the Coin Control section of the advanced GUI, which will let you ignore the dust if you don't want to spend it.


5

Use the secondary click on a address and then the "Send from" option.


3

Electrum appears to have two Coin Selection policies that users can select from. CoinChooserOldestFirst selects oldest first prunes any unneeded inputs starting from the smallest standard policy CoinChooserPrivacy randomly selects UTXO until sufficient prunes any unneeded inputs starting from the smallest attempts to create a change within 0.75 and 1.33 ...


3

Great question, I've always wondered this too. But im pretty sure that Electrum, by default, will send your oldest unspent outputs first. (Sorry if example is a little repetitive) E.g. If you recieved 0.4 on address A 3 days ago, 0.2 on address B 2 days ago and 0.1 in address A again 1 day ago, it would send 0.4 from address A, then 0.2 from address B, then ...


3

Many wallets have the "Coin Control" panel where you can specifically choose which outputs to use in the transaction. Which wallet are you using?


3

Old question, so answers are outdated. Anyone reading this now: bitcoin-qt has coin control features that let you choose whichever txin you want to use.


1

You can, but the process is broken up into multiple RPCs. First you use the listunspent RPC to find outputs to spend. Then you use createrawtransaction with the inputs you want, and the outputs (destinations) you want. If you didn't select all inputs and outputs already (including change, if necessary - any difference between inputs and outputs goes to ...


1

Depends on the software. You can construct a transaction that spends whichever utxos you want, so yes, you can send someone the exact amount of the sum of dust transactions. As for the transaction fee, the network may or may not relay, but even there, you may be able to get a friendly miner to mine it.


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