9aa235c24d BREAKING: Change Psbt serde implementations (Daniel Roberts)
d7e9a84339 Fix Psbt preimage keys in serde test (Daniel Roberts)
62026c1e2d Don't use PSBT_GLOBAL_XPUB as an unknown key in Psbt serde test (Daniel Roberts)
Pull request description:
Implements the conclusion of #3454 by serializing Psbts using the BIP-174 binary encoding, optionally using base64 where appropriate.
The core of the problem is the old derived serde implementation by its nature can't be backwards compatible when serialized in binary formats like bincode. Fields will be added to the Psbt (my motivating case in #4440 ) and this will always break formats like bincode.
ACKs for top commit:
apoelstra:
ACK 9aa235c24d65d23de2afc21fcbd019892bf4ad2a; successfully ran local tests
tcharding:
ACK 9aa235c24d
Tree-SHA512: 4dc9dbf1a71f06769d74fada7e3d5557a3df3ee78769c66c2d8480c434baa0abd2efba555137563af58da2cc1d545813eb43b6c696b363a5777a9836bc1b7382
ecf4b2bcee