Lets say an address has 150 unspent BTC, and I want to transfer 50 BTC to someone else, can I send the remainder (100 BTC) back to the original address? Is this impossible, a bad idea or something that isn't done very often for some other reason?
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possible duplicate: [Can a Bitcoin transaction have the same address for input and output?](http://bitcoin.stackexchange.com/q/12746/5406) – Murch Aug 03 '14 at 18:20
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@Murch, definitely a duplicate, but for some reason this question has produced a better answer. – Samuel Edwin Ward Aug 03 '14 at 21:31