use bitcoin::util::hash::Sha256dHash;
use bitcoin::util::bip143;
-use crypto::sha2::Sha256;
use crypto::digest::Digest;
use secp256k1::{Secp256k1,Message,Signature};
use ln::chan_utils;
use ln::chan_utils::HTLCOutputInCommitment;
use chain::chaininterface::{ChainListener, ChainWatchInterface, BroadcasterInterface};
+use util::sha2::Sha256;
use std::collections::HashMap;
use std::sync::{Arc,Mutex};