ECPair: SECP256k1 Keypair Management for Bitcoin

ecpair is a JavaScript/TypeScript library designed for managing SECP256k1 keypairs, primarily used within the BitcoinJS ecosystem for client-side applications. Currently at stable version 3.0.1, it provides core functionalities for generating new keypairs, importing them from various formats like WIF (Wallet Import Format) or raw private/public keys, and deriving public keys. Releases are generally stable, driven by updates within the broader BitcoinJS ecosystem or critical bug fixes. A key differentiator is its modular architecture, which externalizes all elliptic curve cryptography operations to a separate ECC library (e.g., `tiny-secp256k1`), enhancing flexibility and allowing for specific backend optimizations or compliance. The library is written in TypeScript and ships with comprehensive type definitions, promoting robust development practices.