On 11/16/2015 07:42 PM, Peter Todd via bitcoin-dev wrote: > 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. What is wrong with using they same scheme as sighash_single?
If input 0 has nSequence < maxint-1 then output 0 is replaceable. For fee bumps you would just stick the change in position zero and reduce the value. You get FFS functionality without the hassle of addition other inputs.
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