BIP-174: port public key terminology from BIP 373 (#2085)

The changes are ported from PR 1705 so that the same public key
terminology is reflected in BIP 174 as well. Please refer this
other PR for more details.

Author: rkrux

bip-0174.mediawiki

@@ -507,11 +507,11 @@ The currently defined per-input types are defined as follows:
 |-
 | MuSig2 Participant Public Keys
 | <tt>PSBT_IN_MUSIG2_PARTICIPANT_PUBKEYS = 0x1a</tt>
-| <33 byte plain aggregate pubkey>
-| The MuSig2 aggregate plain public key from the <tt>KeyAgg</tt> algorithm. This key may or may not
+| <33 byte aggregate pubkey (compressed)>
+| The MuSig2 aggregate public key (compressed) from the <tt>KeyAgg</tt> algorithm. This key may or may not
 be in the script directly (as x-only). It may instead be a parent public key from which the public keys in the
 script were derived.
-| <tt><33 byte compressed pubkey>*</tt>
+| <tt><33 byte participant pubkey (compressed)>*</tt>
 | A list of the compressed public keys of the participants in the MuSig2 aggregate key in the order
 required for aggregation. If sorting was done, then the keys must be in the sorted order.
 |
@@ -521,11 +521,11 @@ required for aggregation. If sorting was done, then the keys must be in the sort
 |-
 | MuSig2 Public Nonce
 | <tt>PSBT_IN_MUSIG2_PUB_NONCE = 0x1b</tt>
-| <tt><33 byte compressed pubkey> <33 byte plain pubkey> <32 byte hash or omitted></tt>
-| The compressed public key of the participant providing this nonce, followed by the plain public
+| <tt><33 byte participant pubkey (compressed)> <33 byte aggregate pubkey (compressed)> <32 byte hash or omitted></tt>
+| The compressed public key of the participant providing this nonce, followed by the compressed aggregate public
 key the participant is providing the nonce for, followed by the BIP 341 tapleaf hash of
 the Taproot leaf script that will be signed. If the aggregate key is the taproot internal key or the
-taproot output key, then the tapleaf hash must be omitted. The plain public key must be
+taproot output key, then the tapleaf hash must be omitted. The compressed participant public key must be
 the key found in the script and not the aggregate public key that it was derived from, if it was
 derived from an aggregate key.
 | <tt><66 byte public nonce></tt>
@@ -537,11 +537,11 @@ derived from an aggregate key.
 |-
 | MuSig2 Participant Partial Signature
 | <tt>PSBT_IN_MUSIG2_PARTIAL_SIG = 0x1c</tt>
-| <tt><33 byte compressed pubkey> <33 byte plain pubkey> <32 byte hash or omitted></tt>
+| <tt><33 byte participant pubkey (compressed)> <33 byte aggregate pubkey (compressed)> <32 byte hash or omitted></tt>
 | The compressed public key of the participant providing this partial signature, followed by the
-plain public key the participant is providing the signature for, followed by the BIP 341 tapleaf hash
-of the Taproot leaf script that will be signed. If the aggregate key is the taproot internal key or
-the taproot output key, then the tapleaf hash must be omitted. Note that the plain public key must
+compressed public key the participant is providing the signature for, followed by the BIP 341 tapleaf hash
+of the Taproot leaf script that will be signed. If the aggregate key is the Taproot internal key or
+the Taproot output key, then the tapleaf hash must be omitted. Note that the compressed participant public key must be
 be the key found in the script and not the aggregate public key that it was derived from, if it was
 derived from an aggregate key.
 | <tt><32 byte partial signature></tt>
@@ -691,11 +691,11 @@ determine which outputs are change outputs and verify that the change is returni
 |-
 | MuSig2 Participant Public Keys
 | <tt>PSBT_OUT_MUSIG2_PARTICIPANT_PUBKEYS = 0x08</tt>
-| <33 byte plain aggregate pubkey>
-| The MuSig2 aggregate plain public key from the <tt>KeyAgg</tt> algorithm. This key may or may not
+| <tt><33 byte aggregate pubkey (compressed)></tt>
+| The MuSig2 compressed aggregate public key from the <tt>KeyAgg</tt> algorithm. This key may or may not
 be in the script directly. It may instead be a parent public key from which the public keys in the
 script were derived.
-| <tt><33 byte compressed pubkey>*</tt>
+| <tt><33 byte participant pubkey (compressed)>*</tt>
 | A list of the compressed public keys of the participants in the MuSig2 aggregate key in the order
 required for aggregation. If sorting was done, then the keys must be in the sorted order.
 |