/**
 * Signs a transaction hash with an XP private key.
 *
 * @param txHash - The transaction hash to sign.
 * @param privateKey - The private key to sign with.
 * @returns A promise that resolves to the signature as a `0x` prefixed string.
 */
export declare function xpSignTransaction(txHash: string | Uint8Array, privateKey: string | Uint8Array): Promise<string>;
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