bitcoin-keychain
Keychain gRPC service for Bitcoin (like) currencies
Intro
bitcoin-keychain is a RPC server that helps you derive new addresses from an xpub and maintains mapping between those.
The responsibilities of keychain are:
- derive address for a given derivation path
- get fresh receive and change addresses
- reverse lookup of address to derivation path: for transaction creation, we need to check the address associated to the path belong to the account (not asked by protocol but by hardware wallet)
- get the public key of an address: needed for transaction creation by protocol
- manage gaps
The interface is defined as protobuf
Architecture
Data can be stored in different backend:
- redis
- in memory
We use "in memory" storage for tests / development and redis for production.
All data stored can be recalculated from xpubs at the price of a costly
computation, so you can see this component as a cache.
Related component
The keychain is used by lama
The keychain use lib-grpc for Hierarchical Deterministic Wallets computation (lib-grpc uses btcsuite itself)