use sync::Mutex;
use core::cmp;
-use bitcoin::secp256k1::Signature;
-use bitcoin::secp256k1::key::{PublicKey, SecretKey};
+use bitcoin::secp256k1::{PublicKey, SecretKey};
use bitcoin::secp256k1::constants::{PUBLIC_KEY_SIZE, SECRET_KEY_SIZE, COMPACT_SIGNATURE_SIZE};
+use bitcoin::secp256k1::ecdsa::Signature;
use bitcoin::blockdata::script::Script;
use bitcoin::blockdata::transaction::{OutPoint, Transaction, TxOut};
use bitcoin::consensus;