On Thu, May 10, 2018 at 01:56:46AM +0800, Johnson Lau via bitcoin-dev wrote:
> You should make a “0 fee tx with exactly one OP_TRUE output” standard, but nothing else. This makes sure CPFP will always be needed, so the OP_TRUE output won’t pollute the UTXO set
> 
> Instead, would you consider to use ANYONECANPAY to sign the tx, so it is possible add more inputs for fees? The total tx size is bigger than the OP_TRUE approach, but you don’t need to ask for any protocol change.
> 
> In long-term, I think the right way is to have a more flexible SIGHASH system to allow people to add more inputs and outputs easily.

I don't think that will work, as a zero-fee tx won't get relayed even with
CPFP, due to the fact that we haven't yet implemented package-based tx
relaying.

-- 
https://petertodd.org 'peter'[:-1]@petertodd.org