2024 Q2 Update: What Have We Been Up To?

By thunderbiscuit on 7/2/2024 - Tags: BDK, Project

The bitcoindevkit team has been hard at work for Q2 in 2024, pushing to stabilize the API of its bdk_wallet crate and releasing 4 new alpha versions (9, 10, 11, and 12!), and aiming to release a 1.0 beta in July. Here are some of the notable changes and upgrades to the software libraries we maintain:

  • Update bdk_electrum to use merkle proofs. This PR is the first step in reworking bdk_electrum to use merkle proofs. When we fetch a transaction, we now also obtain the merkle proof and block header for verification. We then confirm a transaction is in a block only after validating it's Merkle proof.
  • Upgrade of rust-bitcoin and rust-miniscript. We upgraded our dependencies on these crates to the latest 0.32.0 and 0.12.0 respectively.
  • Added examples. We added examples and cleaned up our current example crates to help builders stay up-to-date on the latest changes.
  • Use bitcoin::Amount in most public APIs. This change ensures type safety when requiring and providing bitcoin amount in our APIs, using the rust-bitcoin crate Amount type.
  • Introduce Sync and FullScan related types. This change introduced universal structures that represent sync/full-scan requests/results for all SPK-based syncing clients.
  • Allow user provided RNG. This change makes the rand dependency optional.

The language bindings for iOS, Android, and Python have also seen some new alpha release and a ton of new features, in preparation for the beta release.

  • Upgrade to the latest uniffi (0.28.0). This was a major upgrade that gave us a whole new set of functionalities: the ability to implement traits in the foreign languages, using the Display trait to auto-generate the toString() methods, enable API docs in the UDL file, and support for async!
  • Brand new iOS build workflow. This one is nerdy but a goodie. Anyone interested in how we build bindings should check out this major cleanup of our iOS library build workflow!
  • Starting the work on bitcoin-ffi. The team has started the work on a separate crate called bitcoin-ffi (opens new window), effectively migrating the types we exposed from rust-bitcoin into a standalone crate that other projects building on uniffi can use.

# Our Grantees in Action

In addition to our full-time grantees, the BDK Foundation (opens new window) provides part-time grants to folks on special projects. Q2 is funding 2 projects in particular:

  • Wei Chen. Wei has been contributing to BDK since late 2023 and was formerly a full stack Java developer based in Washington D.C. with ten years of experience. The focus of his contributions will be towards assisting with the restructuring of the electrum crate, reengineering of the TxGraph data components to simplify the tracking of lineal conflicts, as well as on performance optimization and the continued debugging of BDK.
  • Manuel Gatti. Manuel is a Project Manager at Wizard Sardine. He is involved in some educational projects related to bitcoin in Italy and hosts an Italian podcast about libertarian philosophy with episodes dedicated to bitcoin as a tool for freedom. He has been contributing to BDK since April 2023 mostly on the project management side (holding calls, helping with triage and prioritization, updating stakeholders). His project consists of conducting user interviews in order to get feedback on BDK usage and possible pain points with the aim to help the team with the definition and prioritization of the development activities.

We've also been active at conferences!

# BDK in the Wild

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Last Updated: 12/19/2024, 6:43:01 PM