/// <reference types="node" />
export declare class CommitmentSecret {
    /**
     * Generic version of commitment secret generator as defined in
     * BOLT3.
     *
     * This function works by decrementing from bits to 0. If the index
     * number has the corresponding bit set, it flips the bit in the
     * secret and hashes it.
     *
     * The natural conclusion is the first secret flips every bit and
     * the last secret flips zero (and is thus the seed).
     *
     * This function can be used for generate the local per-commitment
     * secret based on the per-commitment seed and a commitment index
     * (in this case it) generates all 48 bits.
     *
     * This function can also be used to generate prior commitment
     * secrets from a newer secret, which acts as a prefix.
     *
     * @param base base secret that will be used to derive from
     * @param i secret at index I to generate
     * @param bits bits to evaluate, default is 48
     */
    static derive(base: Buffer, i: bigint, bits?: number): Buffer;
}