[bitcoin-dev] Making OP_TRUE standard?

[Rusty Russell]

Johnson Lau <jl2012 at xbt.hk> writes:
> 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

That won't propagate :(

> 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.

No, that would change the TXID, which we rely on for HTLC transactions.

> 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.

Agreed:
https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2018-April/015862.html

But in the long term we'll have Eltoo and SIGHASH_NOINPUT which both
allow different solutions.

Cheers,
Rusty.