/** Sign block parameters. */
export interface SignBlockParams {
    /** The hash of the block to sign */
    hash: string;
    /** The secret key to sign the block with, in hexadecimal format */
    secretKey: string;
}
/**
 * Sign a block.
 *
 * @param params - Parameters
 * @returns Signature, in hexadecimal format
 */
export declare function signBlock(params: SignBlockParams): string;
/** Verify block parameters. */
export interface VerifyBlockParams {
    /** The hash of the block to verify */
    hash: string;
    /** The signature of the block to verify, in hexadecimal format */
    signature: string;
    /** The public key to verify the block against, in hexadecimal format */
    publicKey: string;
}
/**
 * Verify a block against a public key.
 *
 * @param params Parameters
 * @returns Valid
 */
export declare function verifyBlock(params: VerifyBlockParams): boolean;