Segwit allows old -> old, old -> new, new -> old and of course new -> new
txs.

On 17 Mar 2017 1:47 a.m., "Erik Aronesty via bitcoin-dev" <
bitcoin-dev@lists.linuxfoundation.org> wrote:

Yeah, it does make things harder, and it's easy enough to soft fork to
handle arbitrary opt-in protocol improvements, new much larger block sizes,
whatever you want.   Even OK to migrate to a new system by not allowing
old->old or new->old transactions.



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