/**
 * Verifies the provided signature for the given parameters using the ECDSA public key.
 * @param {object} params - The parameters that were signed.
 * @param {string} signature - The hexadecimal-encoded signature to verify.
 * @param {string} base64PublicKey - The public key in Base64 encoding (SPKI format).
 * @returns {Promise<boolean>} `true` if the signature is valid, `false` otherwise.
 */
export function verifySignature(params: object, signature: string, base64PublicKey: string): Promise<boolean>;
/**
 * Retrieves the public key used for verifying signatures.
 * @param {string} base64PublicKey - The public key in Base64 encoding (SPKI format).
 * @returns {Promise<CryptoKey>} The imported public key object for the ECDSA algorithm.
 * - The public key is expected to be Base64 encoded and formatted in SPKI.
 */
export function getPublicKey(base64PublicKey: string): Promise<CryptoKey>;