bdk-wallet roadmap

[ValuedMammal]

Outlines the upcoming structural changes coming to the Wallet. The motivations cover feature upgrades as well as code cleanup and refactoring to help streamline future developments.

3.x

• feature: create_psbt
• Deprecate sign, get_signers, set_keymap, etc (aka remove signers). SignersContainer remains usable via sign_with_signers. Point users toward Psbt::sign.
• Deprecate descriptor::policy, coin_selection, and TxBuilder; use create_psbt instead

4.0

• feature: Introduce Wallet<K>, a.k.a multiple keychains wallet structure
• Remove Wallet::sign
• Remove TxBuilder

4.1

• Initial support for BIP329 labels? Still in planning/design phase. We can provide the Rust types with serde support; users manage persistence

[notmandatory]

My preference for 3.x would be to introduce new ways to create psbts and sign them while deprecating the old ways (but not removing them). Then in the 4.0 we make the breaking changes to remove the old TxBuilder and wallet signing completely. Users can always stay on the 3.x until they're ready to adopt the new approaches. If that means delaying 4.0 until we get more feedback on 3.x that's fine but I don't think we'll get any feedback unless we make it clear the old ways are being remove in 4.0.

[notmandatory]

For the 4.1 wallet labels discussion please add at link to #168 so we can discuss implementation details there.

[ValuedMammal]

Updated to remove TxBuilder in 4.0.