Descriptor wallet library

Library for building descriptor-based bitcoin wallets. Everything a modern cold and hot bitcoin wallet needs, but which is not (yet) a part of rust-bitcoin library.

The library clearly separates parts requiring access to private keys from those which should operate never touching them. It is advised that wallets should be designed in a way assuming zero private key access for all of their operations aside from transaction signing; this part must be separated into other repository/library and be strictly controlled. One may look after command-line btc-hot and btc-cold wallets in bin directory for an example of how this can be done.

Library provides

• efficient manipulations with BIP-32 derivation paths, separating derivations requiring private key access from those, which will always operate without;
• miniscript & classical bitcoin descriptors;
• PSBT constructor using input descriptors, which allow to specify custom information about RBFs, previous public key P2C tweaks and custom hash types on a per-input basis;
• PSBT signer, supporting RBFs, relative and absolute timelocks, all sighash types, complex scripts, including witness- and taproot-based;
• script templates allowing embedding extended pubkeys into bitcoin script assembly;
• lexicographic ordering of transaction & PSBT inputs & oututs;
• script type system;
• helper types for working with hash-lock contracts;
• PSBT utility functions (retrieving previous output, computing fee);
• transaction resolver API on top of Electrum Server API for convenience computation of already-mined transaction fees etc;
• support for SLIP-32/132 extended pubkey types (ypub, zprv etc).

Command-line wallets

One may install command-line wallets with the following command (requires rust compiler and rustup tools to be already installed on a system):

$ rustup default stable
$ rustup update
$ git clone https://github.com/LNP-BP/descriptor-wallet
$ cd descriptor-wallet
$ cargo install --path . --locked --all-features

This will add btc-hot and btc-cold commands to the system.