export interface ChallengeConfig {
    challengeExpirationTime?: number;
    challengeSecret: string;
}
export declare class ChallengeVerifier {
    private expirationTime;
    private secret;
    constructor({ challengeExpirationTime, challengeSecret }: ChallengeConfig);
    get(did: string): string;
    verify(did: string, challenge: string): boolean;
    private calculateChallenge;
}
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