Serves as the unified entry point for all cryptocurrency operations. Provides a DeriverProxy for key/address derivation, transaction providers, validation, and message signing across BTC, BCH, DOGE, LTC, ETH, MATIC, SOL, XRP, and more. This module abstracts per-chain specifics behind a common interface, making it highly reusable for building multi-coin wallet applications without coupling to individual coin libraries.

A factory function for creating Winston loggers with environment-aware configuration. Supports console and HTTP transports, log levels, and custom formats. Can be extracted and reused in any Node.js project needing structured logging, with minimal modification (just replace the transport targets). Demonstrates clean separation of concerns and environment-based setup.

Implements BIP39 mnemonic codes with PBKDF2 key derivation and support for multiple wordlists (English, Chinese, French, etc.). A self-contained, well-tested cryptographic utility that can be used directly in any JavaScript project requiring seed phrase generation and recovery. No internal dependencies beyond standard Node.js crypto.

Implements a provider factory for external blockchain data APIs (Alchemy, Moralis) with health-aware error handling and cooldown logic. The adapter pattern allows swapping or adding new external providers without changing consumer code. The factory encapsulates provider selection, failure thresholds, and fallback, making it reusable for any project that needs resilient third-party API consumption.

A wrapper around the bn.js library that adds convenient methods for buffer conversion, script number parsing, and serialization. This module is replicated across all coin-specific libraries (BTC, BCH, LTC, DOGE) and provides a consistent interface for big integer arithmetic. It can be extracted as a standalone utility for any blockchain or cryptographic project needing BN operations.