Secp256k1Account

This file defines the Secp256k1Account class, which extends the Account abstract class and provides specific implementations for the Ed25519 signature scheme.

The Secp256k1Account class has the following properties:

• privateKey: The private key of the account.

• mnemonic: A string representing the mnemonic phrase associated with the account.

• publicKey: The public key of the account, derived from the private key.

• address: The account address, derived from the public key and the signature scheme.

• scheme: The signature scheme used by the account, which is Ed25519.

The class provides the following methods:

• toString(): Returns a string representation of the account, including the mnemonic and address.

The companion object provides the following methods:

• generate(): Generates a new Secp256k1Account using a randomly generated mnemonic phrase and seed.