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