use std::sync::Mutex;
use std::cmp;
-use secp256k1::Signature;
-use secp256k1::key::{PublicKey, SecretKey};
+use bitcoin::secp256k1::Signature;
+use bitcoin::secp256k1::key::{PublicKey, SecretKey};
use bitcoin::blockdata::script::Script;
use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
use bitcoin::consensus;