/**
 * True iff `words` is a checksum-valid BIP-39 mnemonic. Length must be one of
 * the standard values and every word must be in the wordlist.
 */
export declare function isValidMnemonic(words: readonly string[]): boolean;
/**
 * Scan text for checksum-valid BIP-39 mnemonics and replace each with
 * `placeholder`. Returns the rewritten text and the number of phrases
 * redacted.
 *
 * Approach: tokenize into maximal runs of wordlist words separated by single
 * spaces, then within each run greedily match the longest valid mnemonic
 * window (24→12) so a 24-word phrase isn't mistaken for two 12-word ones.
 */
export declare function redactMnemonics(text: string, placeholder: string): {
    text: string;
    count: number;
};
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