export declare const isValidAddress: (address: string | undefined | null) => boolean;
export declare const isValidUrl: (url: string | undefined | null) => boolean;
export declare const isValidBlock: (block: string | undefined | null) => boolean;
export declare const isValidCID: (cid: string | undefined | null) => boolean;
export declare const deriveCIDFromHash: (hash: string) => string;
export declare const extractHashFromCID: (cid: string) => string;
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