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On 11/16/2015 07:42 PM, Peter Todd via bitcoin-dev wrote:<br>
<blockquote cite="mid:20151117004218.GB6302@savin.petertodd.org"
type="cite">
<pre wrap="">Sequence is used for opting in as it is the only "free-form" field
available for that purpose. Opt-in per output was proposed as well by
Luke-Jr, however the CTxOut data structure simply doesn't contain any
extra fields to use for that purpose.</pre>
</blockquote>
What is wrong with using they same scheme as sighash_single?<br>
<br>
If input 0 has nSequence < maxint-1 then output 0 is replaceable.
<br>
<br>
For fee bumps you would just stick the change in position zero and
reduce the value.<br>
<br>
You get FFS functionality without the hassle of addition other
inputs. <br>
<br>
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