This is not how it works. While the transaction creator may know which inputs 
are segwit, the validators have no way to tell until they look up the UTXO set.

In a transaction, all information about an input the validators have is the 
36-byte outpoint (txid + index). Just by looking at the outpoint, there is no 
way to tell whether it is segwit-enabled or not. So there needs to be a way to 
tell the validator that “the witness for this input is empty”, and it is the 
“00”.

> On 27 May 2019, at 12:18 AM, Aymeric Vitte <vitteayme...@gmail.com> wrote:
> 
> ……. for the 00 number of witness
> data for non segwit inputs the one that is doing the transaction knows
> which inputs are segwit or not, then parsing the transaction you can
> associate the correct input to the correct witness data, without the
> need of 00, so I must be missing the use case


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