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To: Johnson Lau <jl2012@xbt.hk>
References: <e537e781-e10f-7299-fddb-67fab74124c0@gmail.com>
<6DFB6C65-D123-40FD-9CE3-49FFCA81EE46@xbt.hk>
<e342cb8f-a909-a806-bd76-91580234cd7f@gmail.com>
<253DB697-BECF-4D68-8A1E-1549B52D5AFA@xbt.hk>
From: Aymeric Vitte <vitteaymeric@gmail.com>
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Subject: Re: [bitcoin-dev] Two questions about segwit implementation
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I did not phrase correctly in fact, what I meant is: if the validator
sees empty or witness script in scriptSig, then this is a segwit input,
and doing this one by one the validator can associate the correct segwit
data to the correct segwit input, so 00 does not look to be needed
Le 26/05/2019 à 18:28, Johnson Lau a écrit :
> 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 <vitteaymeric@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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