export interface ChannelKeys {
    pub: string;
    priv: string;
}
/** Fresh channel x25519 keypair — generated by the channel's first user. */
export declare function newChannelKeypair(): ChannelKeys;
/** Channels file: { "<channel>": { "pub": "<b64>", "priv": "<b64>" } }.
 *  Missing or invalid file = no channels. */
export declare function loadChannelKeys(file: string): Record<string, ChannelKeys>;
/** Read-modify-write: keeps the other channels; creates the parent dir
 *  (e.g. ~/.dap) on demand. */
export declare function persistChannelKeys(file: string, name: string, keys: ChannelKeys): void;