/** Validate that a string is a valid Ethereum address (0x + 40 hex chars).
 *  L-12 fix (Audit #8): Also rejects the zero address to prevent accidental fund burns. */
export declare function validateAddress(address: string, fieldName: string): void;
/** Validate that a URL is well-formed HTTP(S). Optionally require HTTPS. */
export declare function validateUrl(url: string, fieldName: string, requireHttps?: boolean): void;
/** Validate that a bigint amount is positive */
export declare function validatePositiveAmount(amount: bigint, fieldName: string): void;
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