So I have seen a few people sending bitcoins without any miner fees, and their amount eventually got sent back after a week or so.
So, what do you think the technique(or tips) for sending bitcoins without miner fees would be? This would be really helpful for sending small amounts less than BTC0.001 since the transaction fee would be more than 10% of the real amount transferred.
You must spend inputs with sufficient priority. That means to pick inputs that are large enough (
BTC1 or higher), old enough (confirmed in the blockchain for 1 day or longer), and not too fragmented (ideally no more than a couple of inputs).
For example to send
BTC0.001 you can pick a 1-day old input of
BTC1 and send
BTC0.999 change back to yourself.