rich1.0npub1m230cem2yh3mtdzkg32qhj73uytgkyg5ylxsu083n3tpjnajxx4qqa2np2https://nostr.ae/npub1m230cem2yh3mtdzkg32qhj73uytgkyg5ylxsu083n3tpjnajxx4qqa2np2njumphttps://nostr.ae📅 Original date posted:2018-05-09 📝 Original message:On Thu, May 10, 2018 at 04:19:31AM +0800, Johnson Lau wrote: > > > > On 10 May 2018, at 3:27 AM, Peter Todd <pete at petertodd.org> wrote: > > > > 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 > > My only concern is UTXO pollution. There could be a “CPFP anchor” softfork that outputs with empty scriptPubKey and 0 value are spendable only in the same block. If not spent immediately, they become invalid and are removed from UTXO. But I still think the best solution is a more flexible SIGHASH system, which doesn’t need CPFP at all. I don't see any reason why UTXO pollution would be a special concern so long as those outputs are subject to the same dust rules as any other output is. -- https://petertodd.org 'peter'[:-1]@petertodd.org -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 488 bytes Desc: not available URL: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/attachments/20180509/17714285/attachment.sig>