📅 Original date posted:2019-05-26
📝 Original message: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 at 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
Johnson Lau [ARCHIVE] /
npub1fy…p2mv9
2023-06-07 20:18:24
in reply to nevent1q…qt22
Author Public Key
npub1fyh6gqhg8zgyhhywkty047s64z2a7fjr307enrr3kqwtnk64plmsup2mv9Published at
2023-06-07 20:18:24Event JSON
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"pubkey": "492fa402e838904bdc8eb2c8fafa1aa895df26438bfd998c71b01cb9db550ff7",
"created_at": 1686161904,
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"content": "📅 Original date posted:2019-05-26\n📝 Original message: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.\n\nIn 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”.\n\n\u003e On 27 May 2019, at 12:18 AM, Aymeric Vitte \u003cvitteaymeric at gmail.com\u003e wrote:\n\u003e \n\u003e ……. for the 00 number of witness\n\u003e data for non segwit inputs the one that is doing the transaction knows\n\u003e which inputs are segwit or not, then parsing the transaction you can\n\u003e associate the correct input to the correct witness data, without the\n\u003e need of 00, so I must be missing the use case",
"sig": "bc0ac6b7b99a2dce5367f822679e736a869222c109e72e36198ab973eac155c08e5eca9f4e6c89eae9f4a32d58d61a64037d3f132a8a48c08a23c2421bedff99"
}