/// <summary>
/// Deterministically derive channel keys from the seed. that means it does not depend on `startingTime` you
/// passed in constructor.
/// </summary>
/// <param name="channelValueSatoshis"></param>
/// <param name="param1"></param>
/// <param name="param2"></param>
/// <returns></returns>
public ChannelKeys DeriveChannelKeys(ulong channelValueSatoshis, ulong param1, ulong param2)
{
var channelId = (uint)((param1 & 0xFFFF_FFFF_0000_0000) >> 32);
var childPrivKey = _channelMasterKey.Derive(channelId);
var uniqueStart =
param2.GetBytesBigEndian()
.Concat(((uint)param1).GetBytesBigEndian())
.Concat(_seed)
.Concat(childPrivKey.PrivateKey.ToBytes());
var seed = Hashes.SHA256(uniqueStart.ToArray());
var commitmentSeed = Hashes.SHA256(seed.Concat(_ascii.DecodeData("commitment seed")).ToArray());
var fundingKey = Hashes.SHA256(commitmentSeed.Concat(_ascii.DecodeData("funding key")).ToArray());
var revocationBaseKey = Hashes.SHA256(fundingKey.Concat(_ascii.DecodeData("revocation base key")).ToArray());
var paymentKey = Hashes.SHA256(revocationBaseKey.Concat(_ascii.DecodeData("payment key")).ToArray());
var delayedPaymentBaseKey = Hashes.SHA256(paymentKey.Concat(_ascii.DecodeData("delayed payment base key")).ToArray());
var htlcBaseKey = Hashes.SHA256(delayedPaymentBaseKey.Concat(_ascii.DecodeData("HTLC base key")).ToArray());
return(new ChannelKeys(new Key(fundingKey), new Key(revocationBaseKey), new Key(paymentKey), new Key(delayedPaymentBaseKey), new Key(htlcBaseKey), new uint256(commitmentSeed), channelValueSatoshis, param1, param2));
}
