/**
 * Derive the 32-byte ed25519 public key from a 32-byte seed.
 *
 * The "seed" is the portal's raw secret — the SAME 32 bytes that serve as the
 * secp256k1 private key for EVM. ed25519 hashes the seed (clamped SHA-512) to
 * get its actual signing scalar, so the ed25519 key is independent of the
 * secp256k1 scalar even though both come from one secret. This is exactly the
 * derivation Phantom/Solflare perform on "import private key", so the address
 * this produces is recoverable there.
 */
export declare function getPublicKey(seed: Buffer | Uint8Array): Buffer;
/**
 * Sign a message with the ed25519 key derived from `seed`. Returns the 64-byte
 * detached signature (R ‖ S).
 */
export declare function sign(message: Buffer | Uint8Array, seed: Buffer | Uint8Array): Buffer;
/** Verify — used in tests and by callers that want to self-check a signature. */
export declare function verify(signature: Buffer | Uint8Array, message: Buffer | Uint8Array, publicKey: Buffer | Uint8Array): boolean;
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