diff --git a/src/blockdata/block.rs b/src/blockdata/block.rs
index 1cccb6e..e0f171e 100644
--- a/src/blockdata/block.rs
+++ b/src/blockdata/block.rs
@@ -32,7 +32,7 @@ use blockdata::transaction::Transaction;
 
 /// A block header, which contains all the block's information except
 /// the actual transactions
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct BlockHeader {
   /// The protocol version. Should always be 1.
   pub version: u32,
@@ -51,7 +51,7 @@ pub struct BlockHeader {
 
 /// A Bitcoin block, which is a collection of transactions with an attached
 /// proof of work.
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct Block {
   /// The block header
   pub header: BlockHeader,
@@ -61,7 +61,7 @@ pub struct Block {
 
 /// A block header with txcount attached, which is given in the `headers`
 /// network message.
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct LoneBlockHeader {
   /// The actual block header
   pub header: BlockHeader,
diff --git a/src/blockdata/opcodes.rs b/src/blockdata/opcodes.rs
index 7c61f99..3a210d1 100644
--- a/src/blockdata/opcodes.rs
+++ b/src/blockdata/opcodes.rs
@@ -38,7 +38,7 @@ pub mod all {
   //       write an #[inline] helper function which casts to u8s.
 
   /// A script Opcode
-  #[derive(Clone, PartialEq, Eq, Show)]
+  #[derive(Clone, PartialEq, Eq, Debug)]
   #[repr(u8)]
   pub enum Opcode {
     /// Push an empty array onto the stack
@@ -632,7 +632,7 @@ pub mod all {
 }
 
 /// Broad categories of opcodes with similar behavior
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub enum OpcodeClass {
   /// Pushes the given number onto the stack
   PushNum(isize),
@@ -658,7 +658,7 @@ macro_rules! ordinary_opcode {
   ($($op:ident),*) => (
     #[repr(u8)]
     #[doc(hidden)]
-    #[derive(Clone, PartialEq, Eq, Show)]
+    #[derive(Clone, PartialEq, Eq, Debug)]
     pub enum Opcode {
       $( $op = all::$op as u8 ),*
     }
diff --git a/src/blockdata/script.rs b/src/blockdata/script.rs
index 9fc36d2..e6cc32a 100644
--- a/src/blockdata/script.rs
+++ b/src/blockdata/script.rs
@@ -48,7 +48,7 @@ use util::hash::Sha256dHash;
 use util::misc::script_find_and_remove;
 use util::thinvec::ThinVec;
 
-#[derive(PartialEq, Eq, Show, Clone)]
+#[derive(PartialEq, Eq, Debug, Clone)]
 /// A Bitcoin script
 pub struct Script(ThinVec<u8>);
 
@@ -63,7 +63,7 @@ impl<S: hash::Writer> hash::Hash<S> for Script {
 /// 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, Show, Clone)]
+#[derive(PartialEq, Eq, Debug, Clone)]
 pub enum ScriptError {
   /// The script returns false no matter the input
   AnalyzeAlwaysReturnsFalse,
@@ -1204,7 +1204,7 @@ impl json::ToJson for ScriptError {
 }
 
 /// A single iteration of a script execution
-#[derive(PartialEq, Eq, Show, Clone)]
+#[derive(PartialEq, Eq, Debug, Clone)]
 pub struct TraceIteration {
   index: usize,
   op_count: usize,
@@ -1216,7 +1216,7 @@ pub struct TraceIteration {
 }
 
 /// A full trace of a script execution
-#[derive(PartialEq, Eq, Show, Clone)]
+#[derive(PartialEq, Eq, Debug, Clone)]
 pub struct ScriptTrace {
   /// A copy of the script
   pub script: Script,
@@ -1232,7 +1232,7 @@ impl_json!(TraceIteration, index, opcode, op_count, executed, errored, effect, s
 
 /// Hashtype of a transaction, encoded in the last byte of a signature,
 /// specifically in the last 5 bits `byte & 31`
-#[derive(PartialEq, Eq, Show, Clone)]
+#[derive(PartialEq, Eq, Debug, Clone)]
 pub enum SignatureHashType {
   /// 0x1: Sign all outputs
   SigHashAll,
@@ -1264,7 +1264,7 @@ impl SignatureHashType {
 }
 
 /// A structure that can hold either a slice or vector, as necessary
-#[derive(Clone, Show)]
+#[derive(Clone, Debug)]
 pub enum MaybeOwned<'a> {
   /// Freshly allocated memory
   Owned(Vec<u8>),
diff --git a/src/blockdata/transaction.rs b/src/blockdata/transaction.rs
index 157a109..6cbad11 100644
--- a/src/blockdata/transaction.rs
+++ b/src/blockdata/transaction.rs
@@ -35,7 +35,7 @@ use network::constants::Network;
 use wallet::address::Address;
 
 /// A transaction input, which defines old coins to be consumed
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct TxIn {
   /// The hash of the transaction whose output is being used an an input
   pub prev_hash: Sha256dHash,
@@ -52,7 +52,7 @@ pub struct TxIn {
 }
 
 /// A transaction output, which defines new coins to be created from old ones.
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct TxOut {
   /// The value of the output, in satoshis
   pub value: u64,
@@ -89,7 +89,7 @@ impl TxOut {
 }
 
 /// A Bitcoin transaction, which describes an authenticated movement of coins
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct Transaction {
   /// The protocol version, should always be 1.
   pub version: u32,
@@ -103,7 +103,7 @@ pub struct Transaction {
 }
 
 /// A transaction error
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub enum TransactionError {
   /// Concatenated script failed in the input half (script error)
   InputScriptFailure(ScriptError),
@@ -130,7 +130,7 @@ impl json::ToJson for TransactionError {
 }
 
 /// A trace of a transaction input's script execution
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct InputTrace {
   input_txid: Sha256dHash,
   input_vout: usize,
@@ -145,7 +145,7 @@ impl_json!(InputTrace, input_txid, input_vout, sig_trace,
                        pubkey_trace, p2sh_trace, error);
 
 /// A trace of a transaction's execution
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct TransactionTrace {
   txid: Sha256dHash,
   inputs: Vec<InputTrace>
diff --git a/src/blockdata/utxoset.rs b/src/blockdata/utxoset.rs
index 62c41ba..93c3b5d 100644
--- a/src/blockdata/utxoset.rs
+++ b/src/blockdata/utxoset.rs
@@ -36,7 +36,7 @@ use util::hash::{DumbHasher, Sha256dHash};
 use util::thinvec::ThinVec;
 
 /// The amount of validation to do when updating the UTXO set
-#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Show)]
+#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug)]
 pub enum ValidationLevel {
   /// Blindly update the UTXO set (NOT recommended)
   NoValidation,
@@ -49,7 +49,7 @@ pub enum ValidationLevel {
 }
 
 /// An error returned from a UTXO set operation
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub enum UtxoSetError {
   /// prevhash of the new block is not the hash of the old block (expected, actual)
   BadPrevHash(Sha256dHash, Sha256dHash),
diff --git a/src/internal_macros.rs b/src/internal_macros.rs
index a9b79f1..f94a14c 100644
--- a/src/internal_macros.rs
+++ b/src/internal_macros.rs
@@ -192,7 +192,7 @@ macro_rules! impl_array_newtype_encodable {
 
 macro_rules! impl_array_newtype_show {
   ($thing:ident) => {
-    impl ::std::fmt::Show for $thing {
+    impl ::std::fmt::Debug for $thing {
       fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
         write!(f, concat!(stringify!($thing), "({})"), self.as_slice())
       }
diff --git a/src/macros.rs b/src/macros.rs
index 08ebc7f..7984143 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -90,7 +90,7 @@ macro_rules! user_enum {
       $(#[$doc] $elem),*
     }
 
-    impl ::std::fmt::Show for $name {
+    impl ::std::fmt::Debug for $name {
       fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
         f.pad(match *self {
           $($elem => $txt),*
diff --git a/src/network/address.rs b/src/network/address.rs
index 6a42d7e..d3ae116 100644
--- a/src/network/address.rs
+++ b/src/network/address.rs
@@ -61,7 +61,7 @@ impl<D:SimpleDecoder<E>, E> ConsensusDecodable<D, E> for Address {
   }
 }
 
-impl fmt::Show for Address {
+impl fmt::Debug for Address {
   fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
     // TODO: render services and hex-ize address
     write!(f, "Address {{services: {}, address: {}, port: {}}}",
diff --git a/src/network/encodable.rs b/src/network/encodable.rs
index 9238c72..af2af87 100644
--- a/src/network/encodable.rs
+++ b/src/network/encodable.rs
@@ -51,11 +51,11 @@ pub trait ConsensusDecodable<D:SimpleDecoder<E>, E> {
 }
 
 /// A variable-length unsigned integer
-#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Show)]
+#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug)]
 pub struct VarInt(pub u64);
 
 /// Data which must be preceded by a 4-byte checksum
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct CheckedData(pub Vec<u8>);
 
 // Primitive types
diff --git a/src/network/message.rs b/src/network/message.rs
index a900675..8632b0f 100644
--- a/src/network/message.rs
+++ b/src/network/message.rs
@@ -34,7 +34,7 @@ use network::serialize::{serialize, RawDecoder, SimpleEncoder, SimpleDecoder};
 use util::misc::prepend_err;
 
 /// Serializer for command string
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct CommandString(pub String);
 
 impl<S:SimpleEncoder<E>, E> ConsensusEncodable<S, E> for CommandString {
@@ -72,7 +72,7 @@ pub enum SocketResponse {
   ConnectionFailed(IoError, Sender<()>)
 }
 
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 /// A Network message payload. Proper documentation is available on the Bitcoin
 /// wiki https://en.bitcoin.it/wiki/Protocol_specification
 pub enum NetworkMessage {
diff --git a/src/network/message_blockdata.rs b/src/network/message_blockdata.rs
index aeeee9a..5fc5cfb 100644
--- a/src/network/message_blockdata.rs
+++ b/src/network/message_blockdata.rs
@@ -23,7 +23,7 @@ use network::encodable::{ConsensusDecodable, ConsensusEncodable};
 use network::serialize::{SimpleDecoder, SimpleEncoder};
 use util::hash::Sha256dHash;
 
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 /// The type of an inventory object
 pub enum InvType {
   /// Error --- these inventories can be ignored
@@ -37,7 +37,7 @@ pub enum InvType {
 // Some simple messages
 
 /// The `getblocks` message
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct GetBlocksMessage {
   /// The protocol version
   pub version: u32,
@@ -50,7 +50,7 @@ pub struct GetBlocksMessage {
 }
 
 /// The `getheaders` message
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct GetHeadersMessage {
   /// The protocol version
   pub version: u32,
@@ -63,7 +63,7 @@ pub struct GetHeadersMessage {
 }
 
 /// An inventory object --- a reference to a Bitcoin object
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct Inventory {
   /// The type of object that is referenced
   pub inv_type: InvType,
diff --git a/src/network/message_network.rs b/src/network/message_network.rs
index 33b973d..4fe3bef 100644
--- a/src/network/message_network.rs
+++ b/src/network/message_network.rs
@@ -27,7 +27,7 @@ use network::socket::Socket;
 /// Some simple messages
 
 /// The `version` message
-#[derive(PartialEq, Eq, Clone, Show)]
+#[derive(PartialEq, Eq, Clone, Debug)]
 pub struct VersionMessage {
   /// The P2P network protocol version
   pub version: u32,
diff --git a/src/util/base58.rs b/src/util/base58.rs
index 97a1cb4..00f827d 100644
--- a/src/util/base58.rs
+++ b/src/util/base58.rs
@@ -21,7 +21,7 @@ use util::thinvec::ThinVec;
 use util::hash::Sha256dHash;
 
 /// An error that might occur during base58 decoding
-#[derive(Show, PartialEq, Eq, Clone)]
+#[derive(Debug, PartialEq, Eq, Clone)]
 pub enum Base58Error {
   /// Invalid character encountered
   BadByte(u8),
diff --git a/src/util/error.rs b/src/util/error.rs
index 6e9b12a..35b2c43 100644
--- a/src/util/error.rs
+++ b/src/util/error.rs
@@ -22,7 +22,7 @@ use std::io::IoError;
 pub type BitcoinResult<T> = Result<T, BitcoinError>;
 
 /// A general error code
-#[derive(PartialEq, Eq, Show, Clone)]
+#[derive(PartialEq, Eq, Debug, Clone)]
 pub enum BitcoinError {
   /// An I/O error
   InputOutput(IoError),
diff --git a/src/util/hash.rs b/src/util/hash.rs
index 0d44c7a..371e254 100644
--- a/src/util/hash.rs
+++ b/src/util/hash.rs
@@ -37,7 +37,7 @@ use util::uint::Uint256;
 pub struct Sha256dHash([u8; 32]);
 impl_array_newtype!(Sha256dHash, u8, 32);
 
-impl ::std::fmt::Show for Sha256dHash {
+impl ::std::fmt::Debug for Sha256dHash {
   fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
     write!(f, "{}", self.be_hex_string().as_slice())
   }
@@ -50,22 +50,22 @@ impl_array_newtype!(Ripemd160Hash, u8, 20);
 /// A "hasher" which just truncates and adds data to its state. Should
 /// only be used for hashtables indexed by "already random" data such
 /// as SHA2 hashes
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct DumbHasher;
 
 /// The state of a `DumbHasher`
 pub struct DumbHasherState([u8; 8]);
 
 /// A 32-bit hash obtained by truncating a real hash
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct Hash32((u8, u8, u8, u8));
 
 /// A 48-bit hash obtained by truncating a real hash
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct Hash48((u8, u8, u8, u8, u8, u8));
 
 /// A 64-bit hash obtained by truncating a real hash
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct Hash64((u8, u8, u8, u8, u8, u8, u8, u8));
 
 
diff --git a/src/util/patricia_tree.rs b/src/util/patricia_tree.rs
index 4c8116a..9c0ef21 100644
--- a/src/util/patricia_tree.rs
+++ b/src/util/patricia_tree.rs
@@ -20,7 +20,7 @@
 //! strings; a Patricia tree uses bitstrings.
 //!
 
-use core::fmt::Show;
+use core::fmt::Debug;
 use core::cmp;
 use std::kinds::marker;
 use std::num::{Zero, One};
@@ -351,10 +351,10 @@ impl<K:BitArray+Eq+Zero+One+BitXor<K,K>+Shl<usize,K>+Shr<usize,K>, V> PatriciaTr
   }
 }
 
-impl<K:BitArray, V:Show> PatriciaTree<K, V> {
+impl<K:BitArray, V:Debug> PatriciaTree<K, V> {
   /// Print the entire tree
   pub fn print<'a>(&'a self) {
-    fn recurse<'a, K:BitArray, V:Show>(tree: &'a PatriciaTree<K, V>, depth: usize) {
+    fn recurse<'a, K:BitArray, V:Debug>(tree: &'a PatriciaTree<K, V>, depth: usize) {
       for i in range(0, tree.skip_len as usize) {
         print!("{:}", if tree.skip_prefix.bit(i) { 1 } else { 0 });
       }
diff --git a/src/util/thinvec.rs b/src/util/thinvec.rs
index 7c052aa..7c671c5 100644
--- a/src/util/thinvec.rs
+++ b/src/util/thinvec.rs
@@ -252,7 +252,7 @@ impl<T> Collection for ThinVec<T> {
   fn len(&self) -> usize { self.cap as usize }
 }
 
-impl<T:fmt::Show> fmt::Show for ThinVec<T> {
+impl<T:fmt::Debug> fmt::Debug for ThinVec<T> {
   fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
     self.as_slice().fmt(f)
   }
diff --git a/src/util/uint.rs b/src/util/uint.rs
index 4fc92b4..f77f610 100644
--- a/src/util/uint.rs
+++ b/src/util/uint.rs
@@ -308,7 +308,7 @@ macro_rules! construct_uint {
       }
     }
 
-    impl fmt::Show for $name {
+    impl fmt::Debug for $name {
       fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         use std::fmt::WriteError;
         use network::encodable::ConsensusEncodable;
diff --git a/src/wallet/address.rs b/src/wallet/address.rs
index 51cbf80..0b68d86 100644
--- a/src/wallet/address.rs
+++ b/src/wallet/address.rs
@@ -116,7 +116,7 @@ impl FromBase58 for Address {
   }
 }
 
-impl ::std::fmt::Show for Address {
+impl ::std::fmt::Debug for Address {
   fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
     write!(f, "{}", self.to_base58check())
   }
diff --git a/src/wallet/address_index.rs b/src/wallet/address_index.rs
index 355d358..569872c 100644
--- a/src/wallet/address_index.rs
+++ b/src/wallet/address_index.rs
@@ -33,7 +33,7 @@ use wallet::wallet::Wallet;
 use util::hash::{DumbHasher, Sha256dHash};
 
 /// The type of a wallet-spendable txout
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub enum WalletTxOutType {
   /// Pay-to-address transaction redeemable using an ECDSA key
   PayToAddress(SecretKey),
@@ -43,7 +43,7 @@ pub enum WalletTxOutType {
 
 
 /// A txout that is spendable by the wallet
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct WalletTxOut {
   /// The TXID of the transaction this output is part of 
   pub txid: Sha256dHash,
@@ -58,7 +58,7 @@ pub struct WalletTxOut {
 }
 
 /// An address index
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct AddressIndex {
   tentative_index: HashMap<Script, Vec<WalletTxOut>>,
   index: HashMap<(Sha256dHash, u32), Vec<WalletTxOut>, DumbHasher>,
diff --git a/src/wallet/bip32.rs b/src/wallet/bip32.rs
index d2508e1..be92163 100644
--- a/src/wallet/bip32.rs
+++ b/src/wallet/bip32.rs
@@ -51,7 +51,7 @@ impl Default for Fingerprint {
 }
 
 /// Extended private key
-#[derive(Clone, PartialEq, Eq, Encodable, Decodable, Show)]
+#[derive(Clone, PartialEq, Eq, Encodable, Decodable, Debug)]
 pub struct ExtendedPrivKey {
   /// The network this key is to be used on
   pub network: Network,
@@ -68,7 +68,7 @@ pub struct ExtendedPrivKey {
 }
 
 /// Extended public key
-#[derive(Clone, PartialEq, Eq, Encodable, Decodable, Show)]
+#[derive(Clone, PartialEq, Eq, Encodable, Decodable, Debug)]
 pub struct ExtendedPubKey {
   /// The network this key is to be used on
   pub network: Network,
@@ -85,7 +85,7 @@ pub struct ExtendedPubKey {
 }
 
 /// A child number for a derived key
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub enum ChildNumber {
   /// Hardened key index, within [0, 2^31 - 1]
   Hardened(u32),
@@ -114,7 +114,7 @@ impl<D: Decoder<E>, E> Decodable<D, E> for ChildNumber {
 }
 
 /// A BIP32 error
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub enum Error {
   /// A pk->pk derivation was attempted on a hardened key
   CannotDeriveFromHardenedKey,
diff --git a/src/wallet/wallet.rs b/src/wallet/wallet.rs
index f655fae..a93fa34 100644
--- a/src/wallet/wallet.rs
+++ b/src/wallet/wallet.rs
@@ -31,7 +31,7 @@ use wallet::address::Address;
 use wallet::address_index::AddressIndex;
 
 /// A Wallet error
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub enum Error {
   /// Tried to lookup an account by name, but none was found
   AccountNotFound,
@@ -54,7 +54,7 @@ pub enum AccountChain {
 }
 
 /// An account
-#[derive(Clone, PartialEq, Eq, Encodable, Decodable, Show)]
+#[derive(Clone, PartialEq, Eq, Encodable, Decodable, Debug)]
 pub struct Account {
   name: String,
   internal_path: Vec<ChildNumber>,
@@ -80,7 +80,7 @@ impl Default for Account {
 }
 
 /// A wallet
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct Wallet {
   master: ExtendedPrivKey,
   accounts: HashMap<String, Account>,