This is a very simple and easy-to-use key/wallet generator for Bitcoin (BTC) and Ethereum (ETH). It's implemented in Golang and incorporates the BIP32, BIP39, BIP43, BIP44, BIP49, BIP84, BIP86, BIP173, SLIP44, and EIP55 protocols. This allows for the creation of keys, mnemonic seeds, and Hierarchical Deterministic (HD) addresses.
PHP class, fully based on the extension openssl, which can create and handle WIF (Wallet Import Format) private keys and (re)build their related P2PKH (Pay to PubkeyHash) addresses. Includes a Base58 class.