diff --git a/src/blockdata/script.rs b/src/blockdata/script.rs
index 2d5f5952..0b6dfbba 100644
--- a/src/blockdata/script.rs
+++ b/src/blockdata/script.rs
@@ -105,7 +105,7 @@ display_from_debug!(Builder);
 /// Ways that a script might fail. Not everything is split up as
 /// much as it could be; patches welcome if more detailed errors
 /// would help you.
-#[derive(PartialEq, Eq, Debug, Clone)]
+#[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Clone, Copy)]
 pub enum Error {
     /// Something did a non-minimal push; for more information see
     /// `https://github.com/bitcoin/bips/blob/master/bip-0062.mediawiki#Push_operators`
diff --git a/src/util/address.rs b/src/util/address.rs
index ed082761..892beaee 100644
--- a/src/util/address.rs
+++ b/src/util/address.rs
@@ -49,7 +49,7 @@ use util::base58;
 use util::ecdsa;
 
 /// Address error.
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone)]
 pub enum Error {
     /// Base58 encoding error
     Base58(base58::Error),
diff --git a/src/util/bip32.rs b/src/util/bip32.rs
index 0934af0f..e512bd39 100644
--- a/src/util/bip32.rs
+++ b/src/util/bip32.rs
@@ -423,16 +423,16 @@ impl fmt::Debug for DerivationPath {
 pub type KeySource = (Fingerprint, DerivationPath);
 
 /// A BIP32 error
-#[derive(Clone, PartialEq, Eq, Debug)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 pub enum Error {
     /// A pk->pk derivation was attempted on a hardened key
     CannotDeriveFromHardenedKey,
     /// A secp256k1 error occurred
-    Ecdsa(secp256k1::Error),
+    Ecdsa(secp256k1::Error), // TODO: This is not necessary ECDSA error and should be renamed
     /// A child number was provided that was out of range
     InvalidChildNumber(u32),
     /// Error creating a master seed --- for application use
-    RngError(String),
+    RngError(String), // TODO: This option seems unused and should be removed, opening a way to make this type copiable
     /// Invalid childnumber format.
     InvalidChildNumberFormat,
     /// Invalid derivation path format.
diff --git a/src/util/contracthash.rs b/src/util/contracthash.rs
index 3e8a4809..9f42030e 100644
--- a/src/util/contracthash.rs
+++ b/src/util/contracthash.rs
@@ -36,7 +36,7 @@ use util::address;
 static PUBKEY: u8 = 0xFE;
 
 /// A contract-hash error
-#[derive(Debug, PartialEq, Eq, Clone)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]
 pub enum Error {
     /// Other secp256k1 related error
     Secp(secp256k1::Error),
diff --git a/src/util/key.rs b/src/util/key.rs
index 1fbc9caa..2aa2e247 100644
--- a/src/util/key.rs
+++ b/src/util/key.rs
@@ -26,7 +26,7 @@ use secp256k1;
 use util::base58;
 
 /// A key-related error.
-#[derive(Debug, PartialEq, Eq, Clone)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 pub enum Error {
     /// Base58 encoding error
     Base58(base58::Error),
diff --git a/src/util/psbt/error.rs b/src/util/psbt/error.rs
index 4c63d158..4f566d78 100644
--- a/src/util/psbt/error.rs
+++ b/src/util/psbt/error.rs
@@ -21,7 +21,7 @@ use util::psbt::raw;
 
 use hashes;
 
-#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 /// Enum for marking psbt hash error
 pub enum PsbtHash {
     Ripemd,
@@ -30,7 +30,7 @@ pub enum PsbtHash {
     Hash256,
 }
 /// Ways that a Partially Signed Transaction might fail.
-#[derive(Clone, PartialEq, Eq, Debug)]
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 pub enum Error {
     /// Magic bytes for a PSBT must be the ASCII for "psbt" serialized in most
     /// significant byte order.