/**
 * Check if a string is a valid bip122 chain reference (32-char lowercase hex).
 */
export declare function isValidBip122ChainReference(chainReference: string): boolean;
/**
 * Derive the bech32 HRP ("bc" or "tb") from a chain reference (genesis hash prefix).
 */
export declare function hrpFromChainReference(chainReference: Uint8Array): string;
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