diff --git a/src/util/bip32.rs b/src/util/bip32.rs
index 107426e3..aac4223b 100644
--- a/src/util/bip32.rs
+++ b/src/util/bip32.rs
@@ -364,10 +364,10 @@ impl ExtendedPrivKey {
     pub fn derive_priv<C: secp256k1::Signing>(
         &self,
         secp: &Secp256k1<C>,
-        cnums: &[ChildNumber],
+        path: &DerivationPath,
     ) -> Result<ExtendedPrivKey, Error> {
         let mut sk: ExtendedPrivKey = *self;
-        for cnum in cnums {
+        for cnum in &path.0 {
             sk = sk.ckd_priv(secp, *cnum)?;
         }
         Ok(sk)
@@ -433,10 +433,10 @@ impl ExtendedPubKey {
     pub fn derive_pub<C: secp256k1::Verification>(
         &self,
         secp: &Secp256k1<C>,
-        cnums: &[ChildNumber],
+        path: &DerivationPath,
     ) -> Result<ExtendedPubKey, Error> {
         let mut pk: ExtendedPubKey = *self;
-        for cnum in cnums {
+        for cnum in &path.0 {
             pk = pk.ckd_pub(secp, *cnum)?
         }
         Ok(pk)
@@ -660,7 +660,7 @@ mod tests {
     fn test_path<C: secp256k1::Signing + secp256k1::Verification>(secp: &Secp256k1<C>,
                  network: Network,
                  seed: &[u8],
-                 path: &[ChildNumber],
+                 path: DerivationPath,
                  expected_sk: &str,
                  expected_pk: &str) {
 
@@ -669,26 +669,26 @@ mod tests {
 
         // Check derivation convenience method for ExtendedPrivKey
         assert_eq!(
-            &sk.derive_priv(secp, path).unwrap().to_string()[..],
+            &sk.derive_priv(secp, &path).unwrap().to_string()[..],
             expected_sk
         );
 
         // Check derivation convenience method for ExtendedPubKey, should error
         // appropriately if any ChildNumber is hardened
-        if path.iter().any(|cnum| cnum.is_hardened()) {
+        if path.0.iter().any(|cnum| cnum.is_hardened()) {
             assert_eq!(
-                pk.derive_pub(secp, path),
+                pk.derive_pub(secp, &path),
                 Err(Error::CannotDeriveFromHardenedKey)
             );
         } else {
             assert_eq!(
-                &pk.derive_pub(secp, path).unwrap().to_string()[..],
+                &pk.derive_pub(secp, &path).unwrap().to_string()[..],
                 expected_pk
             );
         }
 
         // Derive keys, checking hardened and non-hardened derivation one-by-one
-        for &num in path.iter() {
+        for &num in path.0.iter() {
             sk = sk.ckd_priv(secp, num).unwrap();
             match num {
                 Normal {..} => {
@@ -722,32 +722,32 @@ mod tests {
         let seed = hex_decode("000102030405060708090a0b0c0d0e0f").unwrap();
 
         // m
-        test_path(&secp, Bitcoin, &seed, &[],
+        test_path(&secp, Bitcoin, &seed, "m".parse().unwrap(),
                   "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
                   "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8");
 
         // m/0h
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_hardened_idx(0)],
+        test_path(&secp, Bitcoin, &seed, "m/0h".parse().unwrap(),
                   "xprv9uHRZZhk6KAJC1avXpDAp4MDc3sQKNxDiPvvkX8Br5ngLNv1TxvUxt4cV1rGL5hj6KCesnDYUhd7oWgT11eZG7XnxHrnYeSvkzY7d2bhkJ7",
                   "xpub68Gmy5EdvgibQVfPdqkBBCHxA5htiqg55crXYuXoQRKfDBFA1WEjWgP6LHhwBZeNK1VTsfTFUHCdrfp1bgwQ9xv5ski8PX9rL2dZXvgGDnw");
 
         // m/0h/1
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_hardened_idx(0), ChildNumber::from_normal_idx(1)],
+        test_path(&secp, Bitcoin, &seed, "m/0h/1".parse().unwrap(),
                    "xprv9wTYmMFdV23N2TdNG573QoEsfRrWKQgWeibmLntzniatZvR9BmLnvSxqu53Kw1UmYPxLgboyZQaXwTCg8MSY3H2EU4pWcQDnRnrVA1xe8fs",
                    "xpub6ASuArnXKPbfEwhqN6e3mwBcDTgzisQN1wXN9BJcM47sSikHjJf3UFHKkNAWbWMiGj7Wf5uMash7SyYq527Hqck2AxYysAA7xmALppuCkwQ");
 
         // m/0h/1/2h
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_hardened_idx(0), ChildNumber::from_normal_idx(1), ChildNumber::from_hardened_idx(2)],
+        test_path(&secp, Bitcoin, &seed, "m/0h/1/2h".parse().unwrap(),
                   "xprv9z4pot5VBttmtdRTWfWQmoH1taj2axGVzFqSb8C9xaxKymcFzXBDptWmT7FwuEzG3ryjH4ktypQSAewRiNMjANTtpgP4mLTj34bhnZX7UiM",
                   "xpub6D4BDPcP2GT577Vvch3R8wDkScZWzQzMMUm3PWbmWvVJrZwQY4VUNgqFJPMM3No2dFDFGTsxxpG5uJh7n7epu4trkrX7x7DogT5Uv6fcLW5");
 
         // m/0h/1/2h/2
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_hardened_idx(0), ChildNumber::from_normal_idx(1), ChildNumber::from_hardened_idx(2), ChildNumber::from_normal_idx(2)],
+        test_path(&secp, Bitcoin, &seed, "m/0h/1/2h/2".parse().unwrap(),
                   "xprvA2JDeKCSNNZky6uBCviVfJSKyQ1mDYahRjijr5idH2WwLsEd4Hsb2Tyh8RfQMuPh7f7RtyzTtdrbdqqsunu5Mm3wDvUAKRHSC34sJ7in334",
                   "xpub6FHa3pjLCk84BayeJxFW2SP4XRrFd1JYnxeLeU8EqN3vDfZmbqBqaGJAyiLjTAwm6ZLRQUMv1ZACTj37sR62cfN7fe5JnJ7dh8zL4fiyLHV");
 
         // m/0h/1/2h/2/1000000000
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_hardened_idx(0), ChildNumber::from_normal_idx(1), ChildNumber::from_hardened_idx(2), ChildNumber::from_normal_idx(2), ChildNumber::from_normal_idx(1000000000)],
+        test_path(&secp, Bitcoin, &seed, "m/0h/1/2h/2/1000000000".parse().unwrap(),
                   "xprvA41z7zogVVwxVSgdKUHDy1SKmdb533PjDz7J6N6mV6uS3ze1ai8FHa8kmHScGpWmj4WggLyQjgPie1rFSruoUihUZREPSL39UNdE3BBDu76",
                   "xpub6H1LXWLaKsWFhvm6RVpEL9P4KfRZSW7abD2ttkWP3SSQvnyA8FSVqNTEcYFgJS2UaFcxupHiYkro49S8yGasTvXEYBVPamhGW6cFJodrTHy");
     }
@@ -758,32 +758,32 @@ mod tests {
         let seed = hex_decode("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542").unwrap();
 
         // m
-        test_path(&secp, Bitcoin, &seed, &[],
+        test_path(&secp, Bitcoin, &seed, "m".parse().unwrap(),
                   "xprv9s21ZrQH143K31xYSDQpPDxsXRTUcvj2iNHm5NUtrGiGG5e2DtALGdso3pGz6ssrdK4PFmM8NSpSBHNqPqm55Qn3LqFtT2emdEXVYsCzC2U",
                   "xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB");
 
         // m/0
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_normal_idx(0)],
+        test_path(&secp, Bitcoin, &seed, "m/0".parse().unwrap(),
                   "xprv9vHkqa6EV4sPZHYqZznhT2NPtPCjKuDKGY38FBWLvgaDx45zo9WQRUT3dKYnjwih2yJD9mkrocEZXo1ex8G81dwSM1fwqWpWkeS3v86pgKt",
                   "xpub69H7F5d8KSRgmmdJg2KhpAK8SR3DjMwAdkxj3ZuxV27CprR9LgpeyGmXUbC6wb7ERfvrnKZjXoUmmDznezpbZb7ap6r1D3tgFxHmwMkQTPH");
 
         // m/0/2147483647h
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_normal_idx(0), ChildNumber::from_hardened_idx(2147483647)],
+        test_path(&secp, Bitcoin, &seed, "m/0/2147483647h".parse().unwrap(),
                   "xprv9wSp6B7kry3Vj9m1zSnLvN3xH8RdsPP1Mh7fAaR7aRLcQMKTR2vidYEeEg2mUCTAwCd6vnxVrcjfy2kRgVsFawNzmjuHc2YmYRmagcEPdU9",
                   "xpub6ASAVgeehLbnwdqV6UKMHVzgqAG8Gr6riv3Fxxpj8ksbH9ebxaEyBLZ85ySDhKiLDBrQSARLq1uNRts8RuJiHjaDMBU4Zn9h8LZNnBC5y4a");
 
         // m/0/2147483647h/1
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_normal_idx(0), ChildNumber::from_hardened_idx(2147483647), ChildNumber::from_normal_idx(1)],
+        test_path(&secp, Bitcoin, &seed, "m/0/2147483647h/1".parse().unwrap(),
                   "xprv9zFnWC6h2cLgpmSA46vutJzBcfJ8yaJGg8cX1e5StJh45BBciYTRXSd25UEPVuesF9yog62tGAQtHjXajPPdbRCHuWS6T8XA2ECKADdw4Ef",
                   "xpub6DF8uhdarytz3FWdA8TvFSvvAh8dP3283MY7p2V4SeE2wyWmG5mg5EwVvmdMVCQcoNJxGoWaU9DCWh89LojfZ537wTfunKau47EL2dhHKon");
 
         // m/0/2147483647h/1/2147483646h
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_normal_idx(0), ChildNumber::from_hardened_idx(2147483647), ChildNumber::from_normal_idx(1), ChildNumber::from_hardened_idx(2147483646)],
+        test_path(&secp, Bitcoin, &seed, "m/0/2147483647h/1/2147483646h".parse().unwrap(),
                   "xprvA1RpRA33e1JQ7ifknakTFpgNXPmW2YvmhqLQYMmrj4xJXXWYpDPS3xz7iAxn8L39njGVyuoseXzU6rcxFLJ8HFsTjSyQbLYnMpCqE2VbFWc",
                   "xpub6ERApfZwUNrhLCkDtcHTcxd75RbzS1ed54G1LkBUHQVHQKqhMkhgbmJbZRkrgZw4koxb5JaHWkY4ALHY2grBGRjaDMzQLcgJvLJuZZvRcEL");
 
         // m/0/2147483647h/1/2147483646h/2
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_normal_idx(0), ChildNumber::from_hardened_idx(2147483647), ChildNumber::from_normal_idx(1), ChildNumber::from_hardened_idx(2147483646), ChildNumber::from_normal_idx(2)],
+        test_path(&secp, Bitcoin, &seed, "m/0/2147483647h/1/2147483646h/2".parse().unwrap(),
                   "xprvA2nrNbFZABcdryreWet9Ea4LvTJcGsqrMzxHx98MMrotbir7yrKCEXw7nadnHM8Dq38EGfSh6dqA9QWTyefMLEcBYJUuekgW4BYPJcr9E7j",
                   "xpub6FnCn6nSzZAw5Tw7cgR9bi15UV96gLZhjDstkXXxvCLsUXBGXPdSnLFbdpq8p9HmGsApME5hQTZ3emM2rnY5agb9rXpVGyy3bdW6EEgAtqt");
     }
@@ -794,12 +794,12 @@ mod tests {
         let seed = hex_decode("4b381541583be4423346c643850da4b320e46a87ae3d2a4e6da11eba819cd4acba45d239319ac14f863b8d5ab5a0d0c64d2e8a1e7d1457df2e5a3c51c73235be").unwrap();
 
         // m
-        test_path(&secp, Bitcoin, &seed, &[],
+        test_path(&secp, Bitcoin, &seed, "m".parse().unwrap(),
                   "xprv9s21ZrQH143K25QhxbucbDDuQ4naNntJRi4KUfWT7xo4EKsHt2QJDu7KXp1A3u7Bi1j8ph3EGsZ9Xvz9dGuVrtHHs7pXeTzjuxBrCmmhgC6",
                   "xpub661MyMwAqRbcEZVB4dScxMAdx6d4nFc9nvyvH3v4gJL378CSRZiYmhRoP7mBy6gSPSCYk6SzXPTf3ND1cZAceL7SfJ1Z3GC8vBgp2epUt13");
 
         // m/0h
-        test_path(&secp, Bitcoin, &seed, &[ChildNumber::from_hardened_idx(0)],
+        test_path(&secp, Bitcoin, &seed, "m/0h".parse().unwrap(),
                   "xprv9uPDJpEQgRQfDcW7BkF7eTya6RPxXeJCqCJGHuCJ4GiRVLzkTXBAJMu2qaMWPrS7AANYqdq6vcBcBUdJCVVFceUvJFjaPdGZ2y9WACViL4L",
                   "xpub68NZiKmJWnxxS6aaHmn81bvJeTESw724CRDs6HbuccFQN9Ku14VQrADWgqbhhTHBaohPX4CjNLf9fq9MYo6oDaPPLPxSb7gwQN3ih19Zm4Y");