This commit proposes a fix for the problem that an offline verifier
previously was not able to even verify the witness stack of additional
inputs. By providing the full finalized PSBT, a verifier has all the
input data necessary to run the script through the validation engine.
We require the PSBT to be finalized to make sure it contains the final
script witness or final script sig but no extra potentially
privacy-sensitive fields. The Non-Witness and Witness UTXO fields are
explicitly allowed for finalized PSBTs, which makes the format perfect
for the use case.
This addresses two discussion items:
- The list of UTXOs should not be interpreted as a "proof that no other
UTXOs for an address exist".
- The BIP only addresses "signer receives funds with the address" and
not "signer sent a previous transaction" use case.
This re-formats the document for easier editing and diff viewing.
Wiki syntax is weird for lists and line wraps break them. Simple lists
were changed to <ul> or <ol> tags but complex lists remain as they are
to not bloat the diff too much.
Before this commit it was not clear that non-native SegWit outputs
(e.g. P2PKH or P2SH-P2WPKH) only work if the correct scriptSig is
provided.
This then also makes it more clear why P2SH-P2WPKH outputs are NOT
supported by the "simple" variant.
This commit adds a table that clarifies what script types are compatible
with what signing variant and also makes more clear what the exact
format for the signatures of the different variants are.
```
sed -z -i 's/Author: /Authors: /' bip-0*.md
sed -z -i 's/Author: /Authors: /' bip-0*.mediawiki
```
Also align correctly in case of multiple authors.
```
sed -z -i 's/Type: Standards Track/Type: Specification/' bip-0*.md
sed -z -i 's/Type: Standards Track/Type: Specification/' bip-0*.mediawiki
```
After the scripted changes, the changes to BIP-40, BIP-41, and BIP-63
were undone, because it breaks CI.
These three BIPs only exist conceptually and their proposal documents
are missing which causes changes to them ot break the CI. I defer the
changes to these BIPs to a separate pull request to get CI to pass.
