/**
 * @description
 * Verify a valid account proof signature or signatures for an account on Flow.
 *
 * @param {string} appIdentifier - A message string in hexadecimal format
 * @param {object} accountProofData - An object consisting of address, nonce, and signatures
 * @param {string} accountProofData.address - A Flow account address
 * @param {string} accountProofData.nonce - A random string in hexadecimal format (minimum 32 bytes in total, i.e 64 hex characters)
 * @param {object[]} accountProofData.signatures - An array of composite signatures to verify
 * @param {object} [opts={}] - Options object
 * @param {string} opts.fclCryptoContract - An optional override Flow account address where the FCLCrypto contract is deployed
 * @returns {Promise<boolean>} - Returns true if the signature is valid, false otherwise
 *
 * @example
 *
 *  const accountProofData = {
 *   address: "0x123",
 *   nonce: "F0123"
 *   signatures: [{f_type: "CompositeSignature", f_vsn: "1.0.0", addr: "0x123", keyId: 0, signature: "abc123"}],
 *  }
 *
 *  const isValid = await fcl.AppUtils.verifyAccountProof(
 *    "AwesomeAppId",
 *    accountProofData,
 *    {fclCryptoContract}
 *  )
 */
export function verifyAccountProof(appIdentifier: string, { address, nonce, signatures }: {
    address: string;
    nonce: string;
    signatures: object[];
}, opts?: {
    fclCryptoContract: string;
}): Promise<boolean>;
/**
 * @description
 * Verify a valid signature/s for an account on Flow.
 *
 * @param {string} message - A message string in hexadecimal format
 * @param {Array} compSigs - An array of Composite Signatures
 * @param {string} compSigs[].addr - The account address
 * @param {number} compSigs[].keyId - The account keyId
 * @param {string} compSigs[].signature - The signature to verify
 * @param {object} [opts={}] - Options object
 * @param {string} opts.fclCryptoContract - An optional override of Flow account address where the FCLCrypto contract is deployed
 * @returns {boolean} - Returns true if the signature is valid, false otherwise
 *
 * @example
 *
 *  const isValid = await fcl.AppUtils.verifyUserSignatures(
 *    Buffer.from('FOO').toString("hex"),
 *    [{f_type: "CompositeSignature", f_vsn: "1.0.0", addr: "0x123", keyId: 0, signature: "abc123"}],
 *    {fclCryptoContract}
 *  )
 */
export function verifyUserSignatures(message: string, compSigs: any[], opts?: {
    fclCryptoContract: string;
}): boolean;
export function validateArgs(args: any): boolean;