import type { StreamID } from '@ceramicnetwork/streamid';
import { CeramicSigner, CommitData, StreamState } from '@ceramicnetwork/common';
export declare const CACAO_EXPIRED = "cacao_expired";
export declare class SignatureUtils {
    static verifyCommitSignature(commitData: CommitData, signer: CeramicSigner, controller: string, model: StreamID | null, streamId: StreamID): Promise<void>;
    private static _verifyCapabilityAuthz;
    static checkForCacaoExpiration(state: StreamState): void;
}
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