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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?
possible duplicate: Can a Bitcoin transaction have the same address for input and output?
– Murch – 2014-08-03T18:20:16.197@Murch, definitely a duplicate, but for some reason this question has produced a better answer. – Samuel Edwin Ward – 2014-08-03T21:31:05.560