/**
 * A ring signature consists of an initial challenge `c0`
 * plus a list of response scalars `s[]`.
 */
export interface RingSignature {
    c0: string;
    s: string[];
}
/** Supported formats for generating a new public key. */
export type KeyFormat = "compressed" | "uncompressed" | "xonly";
/**
 * Sign a message using a SAG ring signature approach:
 *  - `message`: the data being signed
 *  - `privateKeyHex`: 64-hex (32 bytes)
 *  - `ringPubKeysHex`: each can be x-only (64-hex), compressed (66-hex), or uncompressed (130-hex).
 *
 * Returns { c0, s[] } with each scalar in 64‑hex.
 */
export declare function sign(message: string | Uint8Array, privateKeyHex: string, ringPubKeysHex: string[]): RingSignature;
/**
 * Verify a SAG ring signature:
 *  - `signature` = { c0, s[] }, each 64‑hex
 *  - `message`
 *  - `ringPubKeysHex`: array of x-only, compressed, or uncompressed pubkeys
 */
export declare function verify(signature: RingSignature, message: string | Uint8Array, ringPubKeysHex: string[]): boolean;
/**
 * Generate a new random secp256k1 key pair in the requested format:
 *   - `"compressed"`   => 66‑hex public key (33 bytes, starts with 02/03)
 *   - `"uncompressed"` => 130‑hex public key (65 bytes, starts with 04)
 *   - `"xonly"`        => 64‑hex representing just the X coordinate (assuming even Y)
 *
 * Returns an object { privateKeyHex, publicKeyHex }.
 */
export declare function generateKeyPair(format?: KeyFormat): {
    privateKeyHex: string;
    publicKeyHex: string;
};