Rust-bitcoin, that we use through rust-miniscript, has seen plenty of
breaking changes in the latest version. I've tried to keep the necessary
changes here minimal, still it had to be a single commit to keep it
hygienic. But i'll try to summarize the main things here. Tobin also
wrote a guide about the release at
https://rust-bitcoin.org/blog/release-0.30.0/.
The most verbose change in this commit is probably due to the `Address`
type overhaul. It's overengineered if you ask me but hey here we are. I
tried to keep network validation in commands, and otherwise passing
around unchecked addresses (to avoid having to pass around a global
state between our various components).
Another non-obvious change was changes in hash types upstream and the
removal of `ToHex`, forcing us to get the hex representation of a txid
through its `Display` implementation. It is however displayed backward
in this case ("little-endian" if you will), and we need a regular hex
encoding for some queries to the database. We needed to make sure we
didn't implement any silent bug here.
The rest (Script type changes, PSBT serialization updates, ..) is
probably self-explanatory.
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