Don't create change output (uneconomical output) if not worthy

[ShookLyngs]

Idea

When paying fee in the BTC TX building process, there will be an extra collection if the change amount is in range of:

0 < changeAmount < minUtxoSatoshi

Here we have a new suggestion to NOT create a change output if the changeAmount is less than the cost of creating a change output, which generally equals to the value of minUtxoSatoshi. Currently, the default value of minUtxoSatoshi on the mainnet is 10,000 shannon, therefore the overall logic here is as follow:

if (changeAmount >= 10000) {
  createChangeOutput(changeAmount);
} else {
  // don't create a change output
  // treat the changeAmount as an extra fee to the miner
}

The idea was originally posted here: #176 (comment)

Reference

• What is Uneconomical outputs?