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-checksum = "2011f78f14d5121248d3b4f921434207b1d870fb3bf2efc7d784cae79b19bfbc"
-dependencies = [
- "bellman",
- "blake2b_simd",
- "byteorder",
- "directories",
- "ff",
- "pairing",
- "rand_core 0.5.1",
- "zcash_primitives",
-]
-
-[[package]]
-name = "zeroize"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3cbac2ed2ba24cc90f5e06485ac8c7c1e5449fe8911aef4d8877218af021a5b8"
diff --git a/Cargo.toml b/Cargo.toml
index dae71a02..24a1d1d2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,6 +29,10 @@ members = [ "bitcoin", "ethereum", "model", "monero", "zcash" ]
 [badges]
 travis-ci = { repository = "AleoHQ/wagyu", branch = "master" }
 
+[features]
+default = ["std"]
+std = ["wagyu-model/std", "wagyu-bitcoin/std", "wagyu-ethereum/std", "wagyu-model/std", "wagyu-monero/std", "wagyu-zcash/std"]
+
 [dependencies]
 wagyu-bitcoin = { path = "./bitcoin", version = "0.6.3" }
 wagyu-ethereum = { path = "./ethereum", version = "0.6.3" }
diff --git a/bitcoin/Cargo.toml b/bitcoin/Cargo.toml
index b86aa069..e1896f43 100644
--- a/bitcoin/Cargo.toml
+++ b/bitcoin/Cargo.toml
@@ -38,7 +38,7 @@ tiny-keccak = { version = "1.4" }
 
 [features]
 default = ["std"]
-std = ["wagyu-model/default"]
+std = ["wagyu-model/std"]
 
 [badges]
 travis-ci = { repository = "AleoHQ/wagyu", branch = "master" }
diff --git a/bitcoin/src/address.rs b/bitcoin/src/address.rs
index 3467bee8..b1576527 100644
--- a/bitcoin/src/address.rs
+++ b/bitcoin/src/address.rs
@@ -3,11 +3,11 @@ use crate::network::BitcoinNetwork;
 use crate::private_key::BitcoinPrivateKey;
 use crate::public_key::BitcoinPublicKey;
 use crate::witness_program::WitnessProgram;
+use wagyu_model::no_std::*;
 use wagyu_model::{
     crypto::{checksum, hash160},
     Address, AddressError, PrivateKey,
 };
-use wagyu_model::no_std::*;
 
 use base58::{FromBase58, ToBase58};
 use bech32::{u5, Bech32, FromBase32, ToBase32};
@@ -35,7 +35,12 @@ impl<N: BitcoinNetwork> Address for BitcoinAddress<N> {
         let public_key = private_key.to_public_key();
         match format {
             BitcoinFormat::P2PKH => Self::p2pkh(&public_key),
-            BitcoinFormat::P2WSH => return Err(AddressError::IncompatibleFormats(String::from("non-script"), String::from("p2wsh address"))),
+            BitcoinFormat::P2WSH => {
+                return Err(AddressError::IncompatibleFormats(
+                    String::from("non-script"),
+                    String::from("p2wsh address"),
+                ))
+            }
             BitcoinFormat::P2SH_P2WPKH => Self::p2sh_p2wpkh(&public_key),
             BitcoinFormat::Bech32 => Self::bech32(&public_key),
         }
@@ -45,7 +50,12 @@ impl<N: BitcoinNetwork> Address for BitcoinAddress<N> {
     fn from_public_key(public_key: &Self::PublicKey, format: &Self::Format) -> Result<Self, AddressError> {
         match format {
             BitcoinFormat::P2PKH => Self::p2pkh(public_key),
-            BitcoinFormat::P2WSH => return Err(AddressError::IncompatibleFormats(String::from("non-script"), String::from("p2wsh address"))),
+            BitcoinFormat::P2WSH => {
+                return Err(AddressError::IncompatibleFormats(
+                    String::from("non-script"),
+                    String::from("p2wsh address"),
+                ))
+            }
             BitcoinFormat::P2SH_P2WPKH => Self::p2sh_p2wpkh(public_key),
             BitcoinFormat::Bech32 => Self::bech32(public_key),
         }
@@ -841,14 +851,14 @@ mod tests {
             ),
             (
                 "210253be79afe84fd9342c1f52024379b6da6299ea98844aee23838e8e678a765f7cac",
-                "tb1qhmdep02f0jpjxs36ckyzjtfesknu8a8xmhnva7f3vw95t9g6q4ksaqhl9x"
-            )
+                "tb1qhmdep02f0jpjxs36ckyzjtfesknu8a8xmhnva7f3vw95t9g6q4ksaqhl9x",
+            ),
         ];
 
         #[test]
         fn from_str() {
             SCRIPTPAIRS.iter().for_each(|(script, address)| {
-                let script_hex= hex::decode(script).unwrap();
+                let script_hex = hex::decode(script).unwrap();
                 let new_address = BitcoinAddress::<N>::p2wsh(&script_hex).unwrap();
                 assert_eq!(new_address.to_string(), address.to_string());
                 assert_eq!(new_address.format, BitcoinFormat::P2WSH);
@@ -863,5 +873,4 @@ mod tests {
             });
         }
     }
-
 }
diff --git a/bitcoin/src/amount.rs b/bitcoin/src/amount.rs
index 04d32708..18f938dc 100644
--- a/bitcoin/src/amount.rs
+++ b/bitcoin/src/amount.rs
@@ -1,5 +1,5 @@
-use wagyu_model::{Amount, AmountError};
 use wagyu_model::no_std::*;
+use wagyu_model::{Amount, AmountError};
 
 use core::fmt;
 use serde::Serialize;
diff --git a/bitcoin/src/extended_private_key.rs b/bitcoin/src/extended_private_key.rs
index 19925e15..03e30b00 100644
--- a/bitcoin/src/extended_private_key.rs
+++ b/bitcoin/src/extended_private_key.rs
@@ -78,10 +78,8 @@ impl<N: BitcoinNetwork> ExtendedPrivateKey for BitcoinExtendedPrivateKey<N> {
         let mut extended_private_key = self.clone();
 
         for index in path.to_vec()?.into_iter() {
-            let public_key = &PublicKey::from_secret_key(
-                &extended_private_key.private_key.to_secp256k1_secret_key(),
-            )
-            .serialize_compressed()[..];
+            let public_key = &PublicKey::from_secret_key(&extended_private_key.private_key.to_secp256k1_secret_key())
+                .serialize_compressed()[..];
 
             let mut mac = HmacSha512::new_varkey(&extended_private_key.chain_code)?;
             match index {
diff --git a/bitcoin/src/extended_public_key.rs b/bitcoin/src/extended_public_key.rs
index 23b15bae..0e0e9557 100644
--- a/bitcoin/src/extended_public_key.rs
+++ b/bitcoin/src/extended_public_key.rs
@@ -208,10 +208,7 @@ mod tests {
         let extended_private_key = BitcoinExtendedPrivateKey::<N>::from_str(extended_private_key).unwrap();
         let extended_public_key = BitcoinExtendedPublicKey::<N>::from_extended_private_key(&extended_private_key);
         assert_eq!(expected_extended_public_key, extended_public_key.to_string());
-        assert_eq!(
-            expected_public_key,
-            extended_public_key.public_key.to_string()
-        );
+        assert_eq!(expected_public_key, extended_public_key.public_key.to_string());
         assert_eq!(expected_child_index, u32::from(extended_public_key.child_index));
         assert_eq!(expected_chain_code, hex::encode(extended_public_key.chain_code));
         assert_eq!(
@@ -263,10 +260,7 @@ mod tests {
         extended_public_key: &str,
     ) {
         let extended_public_key = BitcoinExtendedPublicKey::<N>::from_str(&extended_public_key).unwrap();
-        assert_eq!(
-            expected_public_key,
-            extended_public_key.public_key.to_string()
-        );
+        assert_eq!(expected_public_key, extended_public_key.public_key.to_string());
         assert_eq!(expected_child_index, u32::from(extended_public_key.child_index));
         assert_eq!(expected_chain_code, hex::encode(extended_public_key.chain_code));
         assert_eq!(
diff --git a/bitcoin/src/format.rs b/bitcoin/src/format.rs
index 0a295ce8..6182dc57 100644
--- a/bitcoin/src/format.rs
+++ b/bitcoin/src/format.rs
@@ -1,6 +1,6 @@
 use crate::network::BitcoinNetwork;
-use wagyu_model::{AddressError, ExtendedPrivateKeyError, ExtendedPublicKeyError, Format};
 use wagyu_model::no_std::*;
+use wagyu_model::{AddressError, ExtendedPrivateKeyError, ExtendedPublicKeyError, Format};
 
 use core::fmt;
 use serde::Serialize;
diff --git a/bitcoin/src/mnemonic.rs b/bitcoin/src/mnemonic.rs
index 59257862..41043a31 100644
--- a/bitcoin/src/mnemonic.rs
+++ b/bitcoin/src/mnemonic.rs
@@ -6,8 +6,8 @@ use crate::network::BitcoinNetwork;
 use crate::private_key::BitcoinPrivateKey;
 use crate::public_key::BitcoinPublicKey;
 use crate::wordlist::BitcoinWordlist;
-use wagyu_model::{ExtendedPrivateKey, Mnemonic, MnemonicCount, MnemonicError, MnemonicExtended};
 use wagyu_model::no_std::*;
+use wagyu_model::{ExtendedPrivateKey, Mnemonic, MnemonicCount, MnemonicError, MnemonicExtended};
 
 use bitvec::prelude::*;
 use core::{fmt, marker::PhantomData, ops::Div, str, str::FromStr};
diff --git a/bitcoin/src/network/mainnet.rs b/bitcoin/src/network/mainnet.rs
index bc2da274..b37f850a 100644
--- a/bitcoin/src/network/mainnet.rs
+++ b/bitcoin/src/network/mainnet.rs
@@ -1,9 +1,9 @@
 use crate::format::BitcoinFormat;
 use crate::network::BitcoinNetwork;
+use wagyu_model::no_std::*;
 use wagyu_model::{
     AddressError, ChildIndex, ExtendedPrivateKeyError, ExtendedPublicKeyError, Network, NetworkError, PrivateKeyError,
 };
-use wagyu_model::no_std::*;
 
 use core::{fmt, str::FromStr};
 use serde::Serialize;
diff --git a/bitcoin/src/network/mod.rs b/bitcoin/src/network/mod.rs
index 86c3259a..39d16f87 100644
--- a/bitcoin/src/network/mod.rs
+++ b/bitcoin/src/network/mod.rs
@@ -1,8 +1,8 @@
 use crate::format::BitcoinFormat;
+use wagyu_model::no_std::*;
 use wagyu_model::{
     AddressError, ChildIndex, ExtendedPrivateKeyError, ExtendedPublicKeyError, Network, PrivateKeyError,
 };
-use wagyu_model::no_std::*;
 
 pub mod mainnet;
 pub use self::mainnet::*;
diff --git a/bitcoin/src/network/testnet.rs b/bitcoin/src/network/testnet.rs
index 522eaa97..8e695d7e 100644
--- a/bitcoin/src/network/testnet.rs
+++ b/bitcoin/src/network/testnet.rs
@@ -1,9 +1,9 @@
 use crate::format::BitcoinFormat;
 use crate::network::BitcoinNetwork;
+use wagyu_model::no_std::*;
 use wagyu_model::{
     AddressError, ChildIndex, ExtendedPrivateKeyError, ExtendedPublicKeyError, Network, NetworkError, PrivateKeyError,
 };
-use wagyu_model::no_std::*;
 
 use core::{fmt, str::FromStr};
 use serde::Serialize;
diff --git a/bitcoin/src/transaction.rs b/bitcoin/src/transaction.rs
index 5f60d9ee..01b985e5 100644
--- a/bitcoin/src/transaction.rs
+++ b/bitcoin/src/transaction.rs
@@ -5,8 +5,8 @@ use crate::network::BitcoinNetwork;
 use crate::private_key::BitcoinPrivateKey;
 use crate::public_key::BitcoinPublicKey;
 use crate::witness_program::WitnessProgram;
+use wagyu_model::no_std::{io::Read, *};
 use wagyu_model::{PrivateKey, Transaction, TransactionError, TransactionId};
-use wagyu_model::no_std::{*, io::Read};
 
 use base58::FromBase58;
 use bech32::{Bech32, FromBase32};
@@ -313,7 +313,7 @@ pub struct BitcoinTransactionInput<N: BitcoinNetwork> {
     /// Provide more flexibility for multiple signatures (for P2WSH)
     pub additional_witness: Option<(Vec<u8>, bool)>,
     /// Option for additional witness stack script args
-    pub witness_script_data: Option<Vec<u8>>
+    pub witness_script_data: Option<Vec<u8>>,
 }
 
 impl<N: BitcoinNetwork> BitcoinTransactionInput<N> {
@@ -400,7 +400,7 @@ impl<N: BitcoinNetwork> BitcoinTransactionInput<N> {
             witnesses: vec![],
             is_signed: script_sig.len() > 0,
             additional_witness: None,
-            witness_script_data: None
+            witness_script_data: None,
         })
     }
 
@@ -618,8 +618,8 @@ impl<N: BitcoinNetwork> Transaction for BitcoinTransaction<N> {
                     };
                     let c_address = BitcoinAddress::<N>::p2wsh(&input_script)?;
                     address == &c_address
-                },
-                _ => address == &private_key.to_address(&address.format())?
+                }
+                _ => address == &private_key.to_address(&address.format())?,
             };
 
             if address_is_valid && !transaction.parameters.inputs[vin].is_signed {
@@ -632,9 +632,9 @@ impl<N: BitcoinNetwork> Transaction for BitcoinTransaction<N> {
 
                 // Signature
                 let (signature, _) = secp256k1::sign(
-                        &secp256k1::Message::parse_slice(&transaction_hash)?,
-                        &private_key.to_secp256k1_secret_key(),
-                    );
+                    &secp256k1::Message::parse_slice(&transaction_hash)?,
+                    &private_key.to_secp256k1_secret_key(),
+                );
                 let mut signature = signature.serialize_der().as_ref().to_vec();
                 signature.push((input.sighash_code as u32).to_le_bytes()[0]);
                 let signature = [variable_length_integer(signature.len() as u64)?, signature].concat();
@@ -642,9 +642,7 @@ impl<N: BitcoinNetwork> Transaction for BitcoinTransaction<N> {
                 // Public key
                 let public_key = private_key.to_public_key();
                 let public_key_bytes = match (&address.format(), public_key.is_compressed()) {
-                    (BitcoinFormat::P2PKH, false) => {
-                        public_key.to_secp256k1_public_key().serialize().to_vec()
-                    }
+                    (BitcoinFormat::P2PKH, false) => public_key.to_secp256k1_public_key().serialize().to_vec(),
                     _ => public_key.to_secp256k1_public_key().serialize_compressed().to_vec(),
                 };
                 let public_key = [vec![public_key_bytes.len() as u8], public_key_bytes].concat();
@@ -660,29 +658,36 @@ impl<N: BitcoinNetwork> Transaction for BitcoinTransaction<N> {
                             None => return Err(TransactionError::InvalidInputs("P2WSH".into())),
                         };
 
-                        let ser_input_script = [variable_length_integer(input_script.len() as u64)?, input_script].concat();
+                        let ser_input_script =
+                            [variable_length_integer(input_script.len() as u64)?, input_script].concat();
                         transaction.parameters.segwit_flag = true;
                         transaction.parameters.inputs[vin].script_sig = vec![];
                         // TODO: (jaakinyele) Generalize to a vec of additional witnesses
-                        let (other_signature, is_other_sig_first) = match transaction.parameters.inputs[vin].additional_witness.clone() {
-                            Some(n) => (n.0, n.1),
-                            None => return Err(TransactionError::InvalidInputs("P2WSH: missing additional witness input to complete multi-sig".into())),
-                        };
+                        let (other_signature, is_other_sig_first) =
+                            match transaction.parameters.inputs[vin].additional_witness.clone() {
+                                Some(n) => (n.0, n.1),
+                                None => {
+                                    return Err(TransactionError::InvalidInputs(
+                                        "P2WSH: missing additional witness input to complete multi-sig".into(),
+                                    ))
+                                }
+                            };
                         // Determine whether to append or prepend other signature(s)
                         let mut witness_field = match is_other_sig_first {
                             true => vec![other_signature, signature.clone()],
-                            false => vec![signature.clone(), other_signature]
+                            false => vec![signature.clone(), other_signature],
                         };
                         // Append witness stack script args (before witness script)
                         if transaction.parameters.inputs[vin].witness_script_data.is_some() {
-                            let witness_script_data = transaction.parameters.inputs[vin].witness_script_data.clone().unwrap();
-                            let witness_script_data = [vec![witness_script_data.len() as u8], witness_script_data].concat();
+                            let witness_script_data =
+                                transaction.parameters.inputs[vin].witness_script_data.clone().unwrap();
+                            let witness_script_data =
+                                [vec![witness_script_data.len() as u8], witness_script_data].concat();
                             witness_field.append(&mut vec![witness_script_data]);
                         }
                         // Append the witness script last
                         witness_field.append(&mut vec![ser_input_script.clone()]);
-                        transaction.parameters.inputs[vin].witnesses
-                            .append(&mut witness_field);
+                        transaction.parameters.inputs[vin].witnesses.append(&mut witness_field);
                         transaction.parameters.inputs[vin].is_signed = true;
                     }
                     BitcoinFormat::P2SH_P2WPKH => {
@@ -946,11 +951,11 @@ mod tests {
         inputs: Vec<Input>,
         outputs: Vec<Output>,
         expected_signed_transaction: &str,
-        expected_transaction_id: &str
+        expected_transaction_id: &str,
     ) {
         let mut input_vec = vec![];
         for input in &inputs {
-            let private_key = BitcoinPrivateKey::from_str(input.private_key).unwrap();            
+            let private_key = BitcoinPrivateKey::from_str(input.private_key).unwrap();
             let transaction_id = hex::decode(input.transaction_id).unwrap();
             let redeem_script = match (input.redeem_script, input.address_format.clone()) {
                 (Some(script), BitcoinFormat::P2WSH) => Some(hex::decode(script).unwrap()),
@@ -958,15 +963,18 @@ mod tests {
                 (None, BitcoinFormat::P2SH_P2WPKH) => {
                     let mut redeem_script = vec![0x00, 0x14];
                     redeem_script.extend(&hash160(
-                        &private_key.to_public_key().to_secp256k1_public_key().serialize_compressed(),
+                        &private_key
+                            .to_public_key()
+                            .to_secp256k1_public_key()
+                            .serialize_compressed(),
                     ));
                     Some(redeem_script)
                 }
                 (None, _) => None,
-            };    
+            };
             let address = match &input.address_format {
                 BitcoinFormat::P2WSH => BitcoinAddress::<N>::p2wsh(redeem_script.as_ref().unwrap()).unwrap(),
-                _ => private_key.to_address(&input.address_format).unwrap()
+                _ => private_key.to_address(&input.address_format).unwrap(),
             };
             let script_pub_key = input.script_pub_key.map(|script| hex::decode(script).unwrap());
             let sequence = input.sequence.map(|seq| seq.to_vec());
@@ -994,13 +1002,13 @@ mod tests {
             let address = BitcoinAddress::<N>::from_str(output.address);
             if address.is_ok() {
                 output_vec.push(BitcoinTransactionOutput::new(&address.unwrap(), output.amount).unwrap());
-            } else {    
+            } else {
                 let tx_output = BitcoinTransactionOutput {
                     amount: output.amount,
-                    script_pub_key: hex::decode(output.address).unwrap()
+                    script_pub_key: hex::decode(output.address).unwrap(),
                 };
                 output_vec.push(tx_output);
-            }            
+            }
         }
 
         let transaction_parameters = BitcoinTransactionParameters::<N> {
@@ -1020,14 +1028,14 @@ mod tests {
                 .unwrap();
         }
 
-        let signed_transaction_without_witness = hex::encode(&transaction.to_transaction_bytes_without_witness().unwrap());
+        let signed_transaction_without_witness =
+            hex::encode(&transaction.to_transaction_bytes_without_witness().unwrap());
         let transaction_id = hex::encode(&transaction.to_transaction_id().unwrap().txid);
 
         assert_eq!(expected_signed_transaction, &signed_transaction_without_witness);
         assert_eq!(expected_transaction_id, &transaction_id);
     }
 
-
     fn test_transaction<N: BitcoinNetwork>(
         version: u32,
         lock_time: u32,
@@ -1046,7 +1054,10 @@ mod tests {
                 (None, BitcoinFormat::P2SH_P2WPKH) => {
                     let mut redeem_script = vec![0x00, 0x14];
                     redeem_script.extend(&hash160(
-                        &private_key.to_public_key().to_secp256k1_public_key().serialize_compressed(),
+                        &private_key
+                            .to_public_key()
+                            .to_secp256k1_public_key()
+                            .serialize_compressed(),
                     ));
                     Some(redeem_script)
                 }
@@ -1117,7 +1128,10 @@ mod tests {
                 (None, BitcoinFormat::P2SH_P2WPKH) => {
                     let mut redeem_script = vec![0x00, 0x14];
                     redeem_script.extend(&hash160(
-                        &private_key.to_public_key().to_secp256k1_public_key().serialize_compressed(),
+                        &private_key
+                            .to_public_key()
+                            .to_secp256k1_public_key()
+                            .serialize_compressed(),
                     ));
                     Some(redeem_script)
                 }
@@ -1866,7 +1880,7 @@ mod tests {
                 // Not including witness for now
                 expected_signed_transaction: "0200000001fa6a6160f798cba0c5cac5b9d2ba91d177fa8589875ba8ae7e46864c4e42957c37000000171600143d295b6276ff8e4579f3350873db3e839e230f41ffffffff0180841e0000000000220020c015c4a6be010e21657068fc2e6a9d02b27ebe4d490a25846f7237f104d1a3cd00000000",
                 expected_transaction_id: "d7f70088081d8c3bf45040f11789ee53868b4b00f900c86d32702f3497dec879",
-            },    
+            },
             TransactionTestCase { // Transaction 2 -> P2WSH to Bech32(P2WPKH) and itself
                 version: 2,
                 lock_time: 0,
@@ -1923,7 +1937,6 @@ mod tests {
                 );
             });
         }
-
     }
 
     mod test_helper_functions {
diff --git a/bitcoin/src/witness_program.rs b/bitcoin/src/witness_program.rs
index a4547c0c..ef6ec5ae 100644
--- a/bitcoin/src/witness_program.rs
+++ b/bitcoin/src/witness_program.rs
@@ -20,8 +20,8 @@
 //! If the version byte is 0, but the witness program is neither 20 nor 32 bytes, the script must fail.
 //!
 
-use wagyu_model::{AddressError, TransactionError};
 use wagyu_model::no_std::*;
+use wagyu_model::{AddressError, TransactionError};
 
 use core::str::FromStr;
 
diff --git a/bitcoin/src/wordlist/mod.rs b/bitcoin/src/wordlist/mod.rs
index 6aff532d..c8ae8305 100644
--- a/bitcoin/src/wordlist/mod.rs
+++ b/bitcoin/src/wordlist/mod.rs
@@ -1,5 +1,5 @@
-use wagyu_model::wordlist::{Wordlist, WordlistError};
 use wagyu_model::no_std::*;
+use wagyu_model::wordlist::{Wordlist, WordlistError};
 
 pub mod chinese_simplified;
 pub use self::chinese_simplified::*;
diff --git a/ethereum/Cargo.toml b/ethereum/Cargo.toml
index b29b5544..31dc8874 100644
--- a/ethereum/Cargo.toml
+++ b/ethereum/Cargo.toml
@@ -37,7 +37,7 @@ tiny-keccak = { version = "1.4" }
 
 [features]
 default = ["std"]
-std = ["wagyu-model/default"]
+std = ["wagyu-model/std"]
 
 [badges]
 travis-ci = { repository = "AleoHQ/wagyu", branch = "master" }
diff --git a/ethereum/src/address.rs b/ethereum/src/address.rs
index fa3a95d1..c3682a82 100644
--- a/ethereum/src/address.rs
+++ b/ethereum/src/address.rs
@@ -3,9 +3,9 @@ use crate::private_key::EthereumPrivateKey;
 use crate::public_key::EthereumPublicKey;
 use wagyu_model::{to_hex_string, Address, AddressError, PrivateKey};
 
+use core::{convert::TryFrom, fmt, str::FromStr};
 use regex::Regex;
 use serde::Serialize;
-use std::{convert::TryFrom, fmt, str::FromStr};
 use tiny_keccak::keccak256;
 
 /// Represents an Ethereum address
diff --git a/ethereum/src/amount.rs b/ethereum/src/amount.rs
index 644f7c98..b345f9aa 100644
--- a/ethereum/src/amount.rs
+++ b/ethereum/src/amount.rs
@@ -1,7 +1,7 @@
 use wagyu_model::{Amount, AmountError};
 
+use core::fmt;
 use ethereum_types::U256;
-use std::fmt;
 
 /// Represents the amount of Ethereum in wei
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
diff --git a/ethereum/src/derivation_path.rs b/ethereum/src/derivation_path.rs
index 55b72aa1..d45dccb1 100644
--- a/ethereum/src/derivation_path.rs
+++ b/ethereum/src/derivation_path.rs
@@ -1,8 +1,8 @@
 use crate::network::EthereumNetwork;
 use wagyu_model::derivation_path::{ChildIndex, DerivationPath, DerivationPathError};
 
-use std::convert::TryFrom;
-use std::{fmt, marker::PhantomData, str::FromStr};
+use core::convert::TryFrom;
+use core::{fmt, marker::PhantomData, str::FromStr};
 
 /// Represents a Ethereum derivation path
 #[derive(Clone, PartialEq, Eq)]
diff --git a/ethereum/src/extended_private_key.rs b/ethereum/src/extended_private_key.rs
index bc6275bb..6979145c 100644
--- a/ethereum/src/extended_private_key.rs
+++ b/ethereum/src/extended_private_key.rs
@@ -12,10 +12,10 @@ use wagyu_model::{
 };
 
 use base58::{FromBase58, ToBase58};
+use core::{convert::TryFrom, fmt, fmt::Display, marker::PhantomData, str::FromStr};
 use hmac::{Hmac, Mac};
 use secp256k1::{PublicKey, SecretKey};
 use sha2::Sha512;
-use std::{convert::TryFrom, fmt, fmt::Display, marker::PhantomData, str::FromStr};
 
 type HmacSha512 = Hmac<Sha512>;
 
@@ -78,9 +78,8 @@ impl<N: EthereumNetwork> ExtendedPrivateKey for EthereumExtendedPrivateKey<N> {
         let mut extended_private_key = self.clone();
 
         for index in path.to_vec()?.into_iter() {
-            let public_key = &PublicKey::from_secret_key(
-                &extended_private_key.private_key.to_secp256k1_secret_key(),
-            ).serialize_compressed();
+            let public_key = &PublicKey::from_secret_key(&extended_private_key.private_key.to_secp256k1_secret_key())
+                .serialize_compressed();
 
             let mut mac = HmacSha512::new_varkey(&extended_private_key.chain_code)?;
             match index {
diff --git a/ethereum/src/extended_public_key.rs b/ethereum/src/extended_public_key.rs
index c7ed476d..2a957efa 100644
--- a/ethereum/src/extended_public_key.rs
+++ b/ethereum/src/extended_public_key.rs
@@ -10,11 +10,11 @@ use wagyu_model::{
 };
 
 use base58::{FromBase58, ToBase58};
+use core::{convert::TryFrom, fmt, marker::PhantomData, str::FromStr};
 use hex;
 use hmac::{Hmac, Mac};
 use secp256k1::{PublicKey as Secp256k1_PublicKey, SecretKey};
 use sha2::Sha512;
-use std::{convert::TryFrom, fmt, marker::PhantomData, str::FromStr};
 
 type HmacSha512 = Hmac<Sha512>;
 
diff --git a/ethereum/src/format.rs b/ethereum/src/format.rs
index c55c0232..5ad59c90 100644
--- a/ethereum/src/format.rs
+++ b/ethereum/src/format.rs
@@ -1,7 +1,7 @@
 use wagyu_model::Format;
 
+use core::fmt;
 use serde::Serialize;
-use std::fmt;
 
 /// Represents the format of a Ethereum address
 #[derive(Serialize, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
diff --git a/ethereum/src/lib.rs b/ethereum/src/lib.rs
index 8f527fa5..01260f9b 100644
--- a/ethereum/src/lib.rs
+++ b/ethereum/src/lib.rs
@@ -1,7 +1,9 @@
 //! # Ethereum
 //!
 //! A library for generating Ethereum wallets.
-#![warn(unused_extern_crates)]
+//!
+#![cfg_attr(not(feature = "std"), no_std)]
+#![warn(unused_extern_crates, dead_code)]
 #![forbid(unsafe_code)]
 
 pub mod address;
diff --git a/ethereum/src/mnemonic.rs b/ethereum/src/mnemonic.rs
index f7b83085..75820b69 100644
--- a/ethereum/src/mnemonic.rs
+++ b/ethereum/src/mnemonic.rs
@@ -9,11 +9,11 @@ use crate::wordlist::EthereumWordlist;
 use wagyu_model::{ExtendedPrivateKey, Mnemonic, MnemonicCount, MnemonicError, MnemonicExtended};
 
 use bitvec::prelude::*;
+use core::{fmt, marker::PhantomData, ops::Div, str, str::FromStr};
 use hmac::Hmac;
 use pbkdf2::pbkdf2;
 use rand::Rng;
 use sha2::{Digest, Sha256, Sha512};
-use std::{fmt, marker::PhantomData, ops::Div, str, str::FromStr};
 
 const PBKDF2_ROUNDS: usize = 2048;
 const PBKDF2_BYTES: usize = 64;
diff --git a/ethereum/src/private_key.rs b/ethereum/src/private_key.rs
index 442be07c..7d6cdbed 100644
--- a/ethereum/src/private_key.rs
+++ b/ethereum/src/private_key.rs
@@ -3,9 +3,9 @@ use crate::format::EthereumFormat;
 use crate::public_key::EthereumPublicKey;
 use wagyu_model::{Address, AddressError, PrivateKey, PrivateKeyError, PublicKey};
 
+use core::{fmt, fmt::Display, str::FromStr};
 use rand::Rng;
 use secp256k1;
-use std::{fmt, fmt::Display, str::FromStr};
 
 /// Represents an Ethereum private key
 #[derive(Debug, Clone, PartialEq, Eq)]
diff --git a/ethereum/src/public_key.rs b/ethereum/src/public_key.rs
index f0dbdb8e..700297d3 100644
--- a/ethereum/src/public_key.rs
+++ b/ethereum/src/public_key.rs
@@ -3,8 +3,8 @@ use crate::format::EthereumFormat;
 use crate::private_key::EthereumPrivateKey;
 use wagyu_model::{Address, AddressError, PublicKey, PublicKeyError};
 
+use core::{fmt, fmt::Display, str::FromStr};
 use secp256k1;
-use std::{fmt, fmt::Display, str::FromStr};
 
 /// Represents an Ethereum public key
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -17,7 +17,9 @@ impl PublicKey for EthereumPublicKey {
 
     /// Returns the address corresponding to the given public key.
     fn from_private_key(private_key: &Self::PrivateKey) -> Self {
-        Self(secp256k1::PublicKey::from_secret_key(&private_key.to_secp256k1_secret_key()))
+        Self(secp256k1::PublicKey::from_secret_key(
+            &private_key.to_secp256k1_secret_key(),
+        ))
     }
 
     /// Returns the address of the corresponding private key.
@@ -43,7 +45,8 @@ impl FromStr for EthereumPublicKey {
 
     fn from_str(public_key: &str) -> Result<Self, Self::Err> {
         Ok(Self(secp256k1::PublicKey::parse_slice(
-            hex::decode(format!("04{}", public_key).as_str())?.as_slice(), None
+            hex::decode(format!("04{}", public_key).as_str())?.as_slice(),
+            None,
         )?))
     }
 }
diff --git a/ethereum/src/transaction.rs b/ethereum/src/transaction.rs
index a868eaea..8f62468c 100644
--- a/ethereum/src/transaction.rs
+++ b/ethereum/src/transaction.rs
@@ -6,10 +6,10 @@ use crate::private_key::EthereumPrivateKey;
 use crate::public_key::EthereumPublicKey;
 use wagyu_model::{PrivateKey, PublicKey, Transaction, TransactionError, TransactionId};
 
+use core::{fmt, marker::PhantomData, str::FromStr};
 use ethereum_types::U256;
 use rlp::{decode_list, RlpStream};
 use secp256k1;
-use std::{fmt, marker::PhantomData, str::FromStr};
 use tiny_keccak::keccak256;
 
 pub fn to_bytes(value: u32) -> Result<Vec<u8>, TransactionError> {
@@ -187,9 +187,11 @@ impl<N: EthereumNetwork> Transaction for EthereumTransaction<N> {
                     _network: PhantomData,
                 };
                 let message = secp256k1::Message::parse_slice(&raw_transaction.to_transaction_id()?.txid)?;
-                let public_key = EthereumPublicKey::from_secp256k1_public_key(
-                    secp256k1::recover(&message, &secp256k1::Signature::parse_slice(signature.as_slice())?, &recovery_id)?,
-                );
+                let public_key = EthereumPublicKey::from_secp256k1_public_key(secp256k1::recover(
+                    &message,
+                    &secp256k1::Signature::parse_slice(signature.as_slice())?,
+                    &recovery_id,
+                )?);
 
                 Ok(Self {
                     sender: Some(public_key.to_address(&EthereumFormat::Standard)?),
diff --git a/model/src/address.rs b/model/src/address.rs
index ba3ec9fd..b1f96f8a 100644
--- a/model/src/address.rs
+++ b/model/src/address.rs
@@ -10,7 +10,9 @@ use core::{
 };
 
 /// The interface for a generic address.
-pub trait Address: 'static + Clone + Debug + Display + FromStr + Hash + PartialEq + Eq + Ord + Send + Sized + Sync {
+pub trait Address:
+    'static + Clone + Debug + Display + FromStr + Hash + PartialEq + Eq + Ord + Send + Sized + Sync
+{
     type Format: Format;
     type PrivateKey: PrivateKey;
     type PublicKey: PublicKey;
diff --git a/model/src/lib.rs b/model/src/lib.rs
index 259652f3..dacfafd4 100644
--- a/model/src/lib.rs
+++ b/model/src/lib.rs
@@ -6,7 +6,7 @@
 #![warn(unused_extern_crates, dead_code)]
 #![forbid(unsafe_code)]
 
-#[cfg(not(feature="std"))]
+#[cfg(not(feature = "std"))]
 #[allow(unused_imports)]
 #[doc(hidden)]
 #[macro_use]
diff --git a/model/src/mnemonic.rs b/model/src/mnemonic.rs
index 2b0e10d9..04b625d2 100644
--- a/model/src/mnemonic.rs
+++ b/model/src/mnemonic.rs
@@ -137,4 +137,3 @@ impl From<rand_core::Error> for MnemonicError {
         MnemonicError::Crate("rand", format!("{:?}", error))
     }
 }
-
diff --git a/monero/Cargo.toml b/monero/Cargo.toml
index 336161fd..6b044d24 100644
--- a/monero/Cargo.toml
+++ b/monero/Cargo.toml
@@ -18,7 +18,8 @@ edition = "2018"
 build = "build.rs"
 
 [features]
-default = []
+default = ["std"]
+std = ["wagyu-model/std"]
 transaction = []
 
 [dependencies]
diff --git a/monero/src/address.rs b/monero/src/address.rs
index f3742295..cf4e2002 100644
--- a/monero/src/address.rs
+++ b/monero/src/address.rs
@@ -2,10 +2,11 @@ use crate::format::MoneroFormat;
 use crate::network::MoneroNetwork;
 use crate::private_key::MoneroPrivateKey;
 use crate::public_key::MoneroPublicKey;
+use wagyu_model::no_std::{vec, String, ToString};
 use wagyu_model::{Address, AddressError, PrivateKey};
 
 use base58_monero as base58;
-use std::{convert::TryFrom, fmt, marker::PhantomData, str::FromStr};
+use core::{convert::TryFrom, fmt, marker::PhantomData, str::FromStr};
 use tiny_keccak::keccak256;
 
 /// Represents a Monero address
diff --git a/monero/src/amount.rs b/monero/src/amount.rs
index 9b4efa9a..63aaad15 100644
--- a/monero/src/amount.rs
+++ b/monero/src/amount.rs
@@ -1,7 +1,8 @@
+use wagyu_model::no_std::ToString;
 use wagyu_model::Amount;
 
+use core::fmt;
 use serde::Serialize;
-use std::fmt;
 
 // Number of piconeros (base unit) per Monero
 const COIN: i128 = 1_0000_0000_000;
diff --git a/monero/src/format.rs b/monero/src/format.rs
index a2f2da56..5f94e02c 100644
--- a/monero/src/format.rs
+++ b/monero/src/format.rs
@@ -1,8 +1,8 @@
 use crate::network::MoneroNetwork;
-use wagyu_model::{AddressError, Format};
+use wagyu_model::{no_std::vec, AddressError, Format};
 
+use core::fmt;
 use serde::Serialize;
-use std::fmt;
 
 /// Represents the format of a Monero address
 #[derive(Serialize, Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
diff --git a/monero/src/lib.rs b/monero/src/lib.rs
index c88fd537..04e5e05c 100644
--- a/monero/src/lib.rs
+++ b/monero/src/lib.rs
@@ -1,7 +1,8 @@
 //! # Monero
 //!
 //! A library for generating Monero wallets.
-#![warn(unused_extern_crates)]
+#![cfg_attr(not(feature = "std"), no_std)]
+#![warn(unused_extern_crates, dead_code)]
 
 #[macro_use]
 extern crate failure;
diff --git a/monero/src/mnemonic.rs b/monero/src/mnemonic.rs
index 2233fe1b..b28e0320 100644
--- a/monero/src/mnemonic.rs
+++ b/monero/src/mnemonic.rs
@@ -4,12 +4,16 @@ use crate::network::MoneroNetwork;
 use crate::private_key::MoneroPrivateKey;
 use crate::public_key::MoneroPublicKey;
 use crate::wordlist::MoneroWordlist;
-use wagyu_model::{Mnemonic, MnemonicError, PrivateKey};
+use wagyu_model::no_std::vec;
+use wagyu_model::{
+    no_std::{String, ToString, Vec},
+    Mnemonic, MnemonicError, PrivateKey,
+};
 
+use core::{fmt, marker::PhantomData, str, str::FromStr};
 use crc::{crc32, Hasher32};
 use curve25519_dalek::scalar::Scalar;
 use rand::Rng;
-use std::{fmt, marker::PhantomData, str, str::FromStr};
 
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 /// Represents a Monero mnemonic
diff --git a/monero/src/network/mainnet.rs b/monero/src/network/mainnet.rs
index a68a060c..b8ee54e8 100644
--- a/monero/src/network/mainnet.rs
+++ b/monero/src/network/mainnet.rs
@@ -1,9 +1,10 @@
 use super::*;
 use crate::format::MoneroFormat;
+use wagyu_model::no_std::vec;
 use wagyu_model::{AddressError, Network, NetworkError};
 
+use core::{fmt, str::FromStr};
 use serde::Serialize;
-use std::{fmt, str::FromStr};
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize)]
 pub struct Mainnet;
diff --git a/monero/src/network/stagenet.rs b/monero/src/network/stagenet.rs
index 2a74894b..7001b804 100644
--- a/monero/src/network/stagenet.rs
+++ b/monero/src/network/stagenet.rs
@@ -1,9 +1,10 @@
 use super::*;
 use crate::format::MoneroFormat;
+use wagyu_model::no_std::vec;
 use wagyu_model::{AddressError, Network, NetworkError};
 
+use core::{fmt, str::FromStr};
 use serde::Serialize;
-use std::{fmt, str::FromStr};
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize)]
 pub struct Stagenet;
diff --git a/monero/src/network/testnet.rs b/monero/src/network/testnet.rs
index 7b136fd8..51858cc4 100644
--- a/monero/src/network/testnet.rs
+++ b/monero/src/network/testnet.rs
@@ -1,9 +1,10 @@
 use super::*;
 use crate::format::MoneroFormat;
+use wagyu_model::no_std::vec;
 use wagyu_model::{AddressError, Network, NetworkError};
 
+use core::{fmt, str::FromStr};
 use serde::Serialize;
-use std::{fmt, str::FromStr};
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize)]
 pub struct Testnet;
diff --git a/monero/src/one_time_key.rs b/monero/src/one_time_key.rs
index fde0d446..5a14044d 100644
--- a/monero/src/one_time_key.rs
+++ b/monero/src/one_time_key.rs
@@ -3,11 +3,12 @@
 use crate::network::MoneroNetwork;
 use crate::private_key::MoneroPrivateKey;
 use crate::public_key::MoneroPublicKey;
+use wagyu_model::no_std::{vec, String, Vec};
 use wagyu_model::{PublicKeyError, TransactionError};
 
+use core::marker::PhantomData;
 use curve25519_dalek::edwards::{CompressedEdwardsY, EdwardsPoint};
 use curve25519_dalek::{constants::ED25519_BASEPOINT_TABLE, edwards::EdwardsBasepointTable, scalar::Scalar};
-use std::marker::PhantomData;
 use tiny_keccak::keccak256;
 
 #[derive(Debug, Fail)]
diff --git a/monero/src/private_key.rs b/monero/src/private_key.rs
index d598e109..149a6277 100644
--- a/monero/src/private_key.rs
+++ b/monero/src/private_key.rs
@@ -2,12 +2,12 @@ use crate::address::MoneroAddress;
 use crate::format::MoneroFormat;
 use crate::network::MoneroNetwork;
 use crate::public_key::MoneroPublicKey;
-use wagyu_model::{Address, AddressError, PrivateKey, PrivateKeyError, PublicKey};
+use wagyu_model::{no_std::Vec, Address, AddressError, PrivateKey, PrivateKeyError, PublicKey};
 
+use core::{fmt, fmt::Display, marker::PhantomData, str::FromStr};
 use curve25519_dalek::scalar::Scalar;
 use hex;
 use rand::Rng;
-use std::{fmt, fmt::Display, marker::PhantomData, str::FromStr};
 use tiny_keccak::keccak256;
 
 /// Represents a Monero private key
diff --git a/monero/src/public_key.rs b/monero/src/public_key.rs
index bbaa7946..7dc47dbb 100644
--- a/monero/src/public_key.rs
+++ b/monero/src/public_key.rs
@@ -4,8 +4,8 @@ use crate::network::MoneroNetwork;
 use crate::private_key::MoneroPrivateKey;
 use wagyu_model::{Address, AddressError, PublicKey, PublicKeyError};
 
+use core::{fmt, fmt::Display, marker::PhantomData, str::FromStr};
 use curve25519_dalek::{constants::ED25519_BASEPOINT_TABLE, edwards::EdwardsBasepointTable, scalar::Scalar};
-use std::{fmt, fmt::Display, marker::PhantomData, str::FromStr};
 
 /// Represents a Monero public key
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
diff --git a/monero/src/transaction.rs b/monero/src/transaction.rs
index 0ab9af5f..1828abd7 100644
--- a/monero/src/transaction.rs
+++ b/monero/src/transaction.rs
@@ -8,13 +8,13 @@ use crate::private_key::MoneroPrivateKey;
 use crate::public_key::MoneroPublicKey;
 use wagyu_model::{Transaction, TransactionError, TransactionId};
 
-use libc::c_char;
-use serde::{export::PhantomData, Deserialize, Serialize};
-use serde_json;
-use std::{
+use core::{
     ffi::{CStr, CString},
     fmt, str,
 };
+use libc::c_char;
+use serde::{export::PhantomData, Deserialize, Serialize};
+use serde_json;
 
 /// Represents a Monero transaction
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
diff --git a/monero/src/wordlist/mod.rs b/monero/src/wordlist/mod.rs
index e1c6bcc1..0329410f 100644
--- a/monero/src/wordlist/mod.rs
+++ b/monero/src/wordlist/mod.rs
@@ -1,3 +1,4 @@
+use wagyu_model::no_std::{String, Vec};
 use wagyu_model::wordlist::{Wordlist, WordlistError};
 
 pub mod chinese_simplified;
diff --git a/wagyu/cli/bitcoin.rs b/wagyu/cli/bitcoin.rs
index 9cb3dd1f..5c7dca9d 100644
--- a/wagyu/cli/bitcoin.rs
+++ b/wagyu/cli/bitcoin.rs
@@ -13,11 +13,13 @@ use crate::model::{
 
 use clap::{ArgMatches, Values};
 use colored::*;
+use core::{fmt, fmt::Display, str::FromStr};
 use rand::{rngs::StdRng, Rng};
 use rand_core::SeedableRng;
 use serde::{Deserialize, Serialize};
 use serde_json::from_str;
-use std::{fmt, fmt::Display, str::FromStr};
+
+use crate::model::no_std::{format, vec, String, ToOwned, ToString, Vec};
 
 /// Represents a generic wallet to output
 #[derive(Serialize, Debug, Default)]
diff --git a/wagyu/cli/ethereum.rs b/wagyu/cli/ethereum.rs
index 236bf244..b1642a57 100644
--- a/wagyu/cli/ethereum.rs
+++ b/wagyu/cli/ethereum.rs
@@ -12,11 +12,13 @@ use crate::model::{
 
 use clap::{ArgMatches, Values};
 use colored::*;
+use core::{fmt, fmt::Display, str::FromStr};
 use rand::{rngs::StdRng, Rng};
 use rand_core::SeedableRng;
 use serde::{Deserialize, Serialize};
 use serde_json::from_str;
-use std::{fmt, fmt::Display, str::FromStr};
+
+use crate::model::no_std::{format, vec, String, ToOwned, ToString, Vec};
 
 /// Represents a generic wallet to output
 #[derive(Serialize, Debug, Default)]
@@ -564,12 +566,14 @@ impl EthereumOptions {
         let start = self.index;
         let end = start + self.indices;
         let mut options = self.clone();
-        (start..end).map(|index| {
-            // Sets the index to the specified index
-            options.index(Some(index));
-            // Generates the derivation path for the specified information
-            options.to_derivation_path(default)
-        }).collect()
+        (start..end)
+            .map(|index| {
+                // Sets the index to the specified index
+                options.index(Some(index));
+                // Generates the derivation path for the specified information
+                options.to_derivation_path(default)
+            })
+            .collect()
     }
 }
 
@@ -599,7 +603,10 @@ impl CLI for EthereumCLI {
             ("hd", Some(arguments)) => {
                 options.subcommand = Some("hd".into());
                 options.parse(arguments, &["count", "json"]);
-                options.parse(arguments, &["derivation", "index", "indices", "language", "password", "word count"]);
+                options.parse(
+                    arguments,
+                    &["derivation", "index", "indices", "language", "password", "word count"],
+                );
             }
             ("import", Some(arguments)) => {
                 options.subcommand = Some("import".into());
@@ -650,17 +657,24 @@ impl CLI for EthereumCLI {
                                 password,
                                 &options.to_derivation_path(true).unwrap(),
                             )
-                                .unwrap();
+                            .unwrap();
                             let mnemonic = &wallet.mnemonic.unwrap();
 
                             // Generate the HD wallet, from `index` to a number of specified `indices`
-                            options.to_derivation_paths(true).iter().flat_map(|path| {
-                                match EthereumWallet::from_mnemonic::<N, W>(mnemonic, password, path.as_ref().unwrap()) {
-                                    Ok(wallet) => vec![wallet],
-                                    _ => vec![],
-                                }
-                            })
-                            .collect::<Vec<EthereumWallet>>()
+                            options
+                                .to_derivation_paths(true)
+                                .iter()
+                                .flat_map(|path| {
+                                    match EthereumWallet::from_mnemonic::<N, W>(
+                                        mnemonic,
+                                        password,
+                                        path.as_ref().unwrap(),
+                                    ) {
+                                        Ok(wallet) => vec![wallet],
+                                        _ => vec![],
+                                    }
+                                })
+                                .collect::<Vec<EthereumWallet>>()
                         })
                         .collect()
                 }
@@ -685,7 +699,11 @@ impl CLI for EthereumCLI {
                             let mut wallets = vec![];
                             let password = options.password.as_ref().map(String::as_str);
                             for path in options.to_derivation_paths(true) {
-                                wallets.push(EthereumWallet::from_mnemonic::<EN, EW>(mnemonic, password, path.as_ref().unwrap())?);
+                                wallets.push(EthereumWallet::from_mnemonic::<EN, EW>(
+                                    mnemonic,
+                                    password,
+                                    path.as_ref().unwrap(),
+                                )?);
                             }
                             Ok(wallets)
                         }
@@ -700,22 +718,28 @@ impl CLI for EthereumCLI {
                             .or(process_mnemonic::<N, Spanish>(&mnemonic, &options))?
                     } else if let Some(extended_private_key) = options.extended_private_key.clone() {
                         // Generate the extended private keys, from `index` to a number of specified `indices`
-                        options.to_derivation_paths(true).iter().flat_map(|path| {
-                            match EthereumWallet::from_extended_private_key::<N>(&extended_private_key, path) {
-                                Ok(wallet) => vec![wallet],
-                                _ => vec![],
-                            }
-                        })
-                        .collect::<Vec<EthereumWallet>>()
+                        options
+                            .to_derivation_paths(true)
+                            .iter()
+                            .flat_map(|path| {
+                                match EthereumWallet::from_extended_private_key::<N>(&extended_private_key, path) {
+                                    Ok(wallet) => vec![wallet],
+                                    _ => vec![],
+                                }
+                            })
+                            .collect::<Vec<EthereumWallet>>()
                     } else if let Some(extended_public_key) = options.extended_public_key.clone() {
                         // Generate the extended public keys, from `index` to a number of specified `indices`
-                        options.to_derivation_paths(true).iter().flat_map(|path| {
-                            match EthereumWallet::from_extended_public_key::<N>(&extended_public_key, path) {
-                                Ok(wallet) => vec![wallet],
-                                _ => vec![],
-                            }
-                        })
-                        .collect::<Vec<EthereumWallet>>()
+                        options
+                            .to_derivation_paths(true)
+                            .iter()
+                            .flat_map(|path| {
+                                match EthereumWallet::from_extended_public_key::<N>(&extended_public_key, path) {
+                                    Ok(wallet) => vec![wallet],
+                                    _ => vec![],
+                                }
+                            })
+                            .collect::<Vec<EthereumWallet>>()
                     } else {
                         vec![]
                     }
diff --git a/wagyu/cli/mod.rs b/wagyu/cli/mod.rs
index 3c448756..ceae86a2 100644
--- a/wagyu/cli/mod.rs
+++ b/wagyu/cli/mod.rs
@@ -15,6 +15,8 @@ use types::*;
 
 use clap::{App, AppSettings, Arg, ArgMatches, SubCommand};
 
+use crate::model::no_std::{format, String, Vec};
+
 pub trait CLI {
     type Options;
 
diff --git a/wagyu/cli/monero.rs b/wagyu/cli/monero.rs
index ee593058..e916cbbb 100644
--- a/wagyu/cli/monero.rs
+++ b/wagyu/cli/monero.rs
@@ -7,10 +7,12 @@ use crate::monero::{
 
 use clap::{ArgMatches, Values};
 use colored::*;
+use core::{fmt, fmt::Display, str::FromStr};
 use rand::{rngs::StdRng, Rng};
 use rand_core::SeedableRng;
 use serde::Serialize;
-use std::{fmt, fmt::Display, str::FromStr};
+
+use crate::model::no_std::{format, vec, String, ToOwned, ToString, Vec};
 
 /// Represents a generic wallet to output
 #[derive(Serialize, Debug, Default)]
diff --git a/wagyu/cli/zcash.rs b/wagyu/cli/zcash.rs
index 275a583a..96ccba66 100644
--- a/wagyu/cli/zcash.rs
+++ b/wagyu/cli/zcash.rs
@@ -9,11 +9,13 @@ use crate::zcash::{
 
 use clap::{ArgMatches, Values};
 use colored::*;
+use core::{fmt, fmt::Display, str::FromStr};
 use rand::{rngs::StdRng, Rng};
 use rand_core::SeedableRng;
 use serde::{Deserialize, Serialize};
 use serde_json::from_str;
-use std::{fmt, fmt::Display, str::FromStr};
+
+use crate::model::no_std::{format, vec, String, ToOwned, ToString, Vec};
 
 /// Represents values to derive standard wallets
 #[derive(Serialize, Clone, Debug)]
diff --git a/wagyu/lib.rs b/wagyu/lib.rs
index 9b3559be..a8c7bedf 100644
--- a/wagyu/lib.rs
+++ b/wagyu/lib.rs
@@ -1,3 +1,6 @@
+#![warn(unused_extern_crates, dead_code)]
+#![forbid(unsafe_code)]
+
 #[macro_use]
 extern crate failure;
 
diff --git a/zcash/Cargo.toml b/zcash/Cargo.toml
index c020fa73..74591571 100644
--- a/zcash/Cargo.toml
+++ b/zcash/Cargo.toml
@@ -49,6 +49,12 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0" }
 sha2 = { version = "0.8" }
 
+failure = { version = "0.1.8", default-features = false, features = ["derive"] }
+
+[features]
+default = ["std"]
+std = ["wagyu-model/std"]
+
 [dev-dependencies]
 # librustzcash fork dependencies
 hex-literal = { version = "0.2" }
diff --git a/zcash/src/address.rs b/zcash/src/address.rs
index a9e6827e..fe4c4a06 100644
--- a/zcash/src/address.rs
+++ b/zcash/src/address.rs
@@ -4,6 +4,7 @@ use crate::librustzcash::JUBJUB;
 use crate::network::ZcashNetwork;
 use crate::private_key::ZcashPrivateKey;
 use crate::public_key::{P2PKHViewingKey, SaplingFullViewingKey, SproutViewingKey, ZcashPublicKey};
+use wagyu_model::no_std::{vec, String, ToString, Vec};
 use wagyu_model::{
     crypto::{checksum, hash160},
     Address, AddressError, PrivateKey,
@@ -11,11 +12,11 @@ use wagyu_model::{
 
 use base58::{FromBase58, ToBase58};
 use bech32::{Bech32, FromBase32, ToBase32};
+use core::{convert::TryFrom, fmt, marker::PhantomData, str, str::FromStr};
 use curve25519_dalek::constants::ED25519_BASEPOINT_TABLE;
 use curve25519_dalek::scalar::Scalar;
 use rand::{rngs::StdRng, Rng};
 use rand_core::SeedableRng;
-use std::{convert::TryFrom, fmt, marker::PhantomData, str, str::FromStr};
 
 /// Represents a Zcash address
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
diff --git a/zcash/src/amount.rs b/zcash/src/amount.rs
index 4cc502c5..7b4a24a1 100644
--- a/zcash/src/amount.rs
+++ b/zcash/src/amount.rs
@@ -1,7 +1,8 @@
+use wagyu_model::no_std::ToString;
 use wagyu_model::{Amount, AmountError};
 
+use core::fmt;
 use serde::Serialize;
-use std::fmt;
 
 // Number of zatoshis (base unit) per ZEC
 const COIN: i64 = 1_0000_0000;
diff --git a/zcash/src/derivation_path.rs b/zcash/src/derivation_path.rs
index 3cd66b78..f131374d 100644
--- a/zcash/src/derivation_path.rs
+++ b/zcash/src/derivation_path.rs
@@ -1,7 +1,8 @@
 use crate::network::ZcashNetwork;
 use wagyu_model::derivation_path::{ChildIndex, DerivationPath, DerivationPathError};
+use wagyu_model::no_std::{vec, ToString, Vec};
 
-use std::{convert::TryFrom, fmt, marker::PhantomData, str::FromStr};
+use core::{convert::TryFrom, fmt, marker::PhantomData, str::FromStr};
 
 /// Represents a Zcash derivation path
 #[derive(Clone, PartialEq, Eq)]
diff --git a/zcash/src/extended_private_key.rs b/zcash/src/extended_private_key.rs
index 50dd9dcb..922e93ed 100644
--- a/zcash/src/extended_private_key.rs
+++ b/zcash/src/extended_private_key.rs
@@ -6,13 +6,14 @@ use crate::librustzcash::zip32::ExtendedSpendingKey;
 use crate::network::ZcashNetwork;
 use crate::private_key::{SaplingSpendingKey, ZcashPrivateKey};
 use crate::public_key::ZcashPublicKey;
+use wagyu_model::no_std::{vec, ToString, Vec};
 use wagyu_model::{
     Address, AddressError, ChildIndex, DerivationPath, ExtendedPrivateKey, ExtendedPrivateKeyError, ExtendedPublicKey,
     PublicKey,
 };
 
 use bech32::{Bech32, FromBase32, ToBase32};
-use std::{cmp::Ordering, fmt, fmt::Display, marker::PhantomData, str::FromStr};
+use core::{cmp::Ordering, fmt, fmt::Display, marker::PhantomData, str::FromStr};
 
 /// Represents a Zcash extended private key
 #[derive(Debug, Clone)]
diff --git a/zcash/src/extended_public_key.rs b/zcash/src/extended_public_key.rs
index 4ae585a9..6d5b2138 100644
--- a/zcash/src/extended_public_key.rs
+++ b/zcash/src/extended_public_key.rs
@@ -5,12 +5,13 @@ use crate::format::ZcashFormat;
 use crate::librustzcash::zip32::ExtendedFullViewingKey;
 use crate::network::ZcashNetwork;
 use crate::public_key::ZcashPublicKey;
+use wagyu_model::no_std::{vec, ToString, Vec};
 use wagyu_model::{
     Address, AddressError, ChildIndex, DerivationPath, DerivationPathError, ExtendedPublicKey, ExtendedPublicKeyError,
 };
 
 use bech32::{Bech32, FromBase32, ToBase32};
-use std::{cmp::Ordering, fmt, fmt::Display, str::FromStr};
+use core::{cmp::Ordering, fmt, fmt::Display, str::FromStr};
 
 /// Represents a Zcash extended public key
 #[derive(Debug, Clone)]
diff --git a/zcash/src/format.rs b/zcash/src/format.rs
index bc157663..3081056b 100644
--- a/zcash/src/format.rs
+++ b/zcash/src/format.rs
@@ -1,8 +1,9 @@
 use crate::network::ZcashNetwork;
+use wagyu_model::no_std::Vec;
 use wagyu_model::{AddressError, Format};
 
+use core::fmt;
 use serde::Serialize;
-use std::fmt;
 
 /// Represents the format of a Zcash address
 #[derive(Serialize, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
diff --git a/zcash/src/lib.rs b/zcash/src/lib.rs
index bf9f6d9c..0b85c66b 100644
--- a/zcash/src/lib.rs
+++ b/zcash/src/lib.rs
@@ -1,9 +1,19 @@
 //! # Zcash
 //!
 //! A library for generating Zcash wallets.
-#![warn(unused_extern_crates)]
+#![cfg_attr(not(feature = "std"), no_std)]
+#![warn(unused_extern_crates, dead_code)]
 #![forbid(unsafe_code)]
 
+#[cfg(not(feature = "std"))]
+#[allow(unused_imports)]
+#[doc(hidden)]
+#[macro_use]
+extern crate alloc;
+
+#[macro_use]
+extern crate failure;
+
 #[cfg(test)]
 #[macro_use]
 extern crate hex_literal;
diff --git a/zcash/src/librustzcash/algebra/curve/bls12_381/ec.rs b/zcash/src/librustzcash/algebra/curve/bls12_381/ec.rs
index fc773d72..78c561df 100644
--- a/zcash/src/librustzcash/algebra/curve/bls12_381/ec.rs
+++ b/zcash/src/librustzcash/algebra/curve/bls12_381/ec.rs
@@ -10,6 +10,8 @@ macro_rules! curve_impl {
         $compressed:ident,
         $pairing:ident
     ) => {
+        use wagyu_model::no_std::Vec;
+
         #[derive(Copy, Clone, PartialEq, Eq, Debug)]
         pub struct $affine {
             pub(crate) x: $basefield,
@@ -17,8 +19,8 @@ macro_rules! curve_impl {
             pub(crate) infinity: bool,
         }
 
-        impl ::std::fmt::Display for $affine {
-            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        impl ::core::fmt::Display for $affine {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
                 if self.infinity {
                     write!(f, "{}(Infinity)", $name)
                 } else {
@@ -34,8 +36,8 @@ macro_rules! curve_impl {
             pub(crate) z: $basefield,
         }
 
-        impl ::std::fmt::Display for $projective {
-            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        impl ::core::fmt::Display for $projective {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
                 write!(f, "{}", self.into_affine())
             }
         }
@@ -619,8 +621,8 @@ pub mod g1 {
     use crate::librustzcash::algebra::field::{BitIterator, Field, PrimeField, PrimeFieldRepr, SqrtField};
     use crate::librustzcash::algebra::group::{CurveAffine, CurveProjective, EncodedPoint, GroupDecodingError};
 
+    use core::fmt;
     use rand_core::RngCore;
-    use std::fmt;
 
     curve_impl!(
         "G1",
@@ -1283,8 +1285,8 @@ pub mod g2 {
     use crate::librustzcash::algebra::field::{BitIterator, Field, PrimeField, PrimeFieldRepr, SqrtField};
     use crate::librustzcash::algebra::group::{CurveAffine, CurveProjective, EncodedPoint, GroupDecodingError};
 
+    use core::fmt;
     use rand_core::RngCore;
-    use std::fmt;
     curve_impl!(
         "G2",
         G2,
diff --git a/zcash/src/librustzcash/algebra/curve/bls12_381/fq12.rs b/zcash/src/librustzcash/algebra/curve/bls12_381/fq12.rs
index 0301a05e..3218e3a6 100644
--- a/zcash/src/librustzcash/algebra/curve/bls12_381/fq12.rs
+++ b/zcash/src/librustzcash/algebra/curve/bls12_381/fq12.rs
@@ -12,8 +12,8 @@ pub struct Fq12 {
     pub c1: Fq6,
 }
 
-impl ::std::fmt::Display for Fq12 {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+impl ::core::fmt::Display for Fq12 {
+    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
         write!(f, "Fq12({} + {} * w)", self.c0, self.c1)
     }
 }
diff --git a/zcash/src/librustzcash/algebra/curve/bls12_381/fq2.rs b/zcash/src/librustzcash/algebra/curve/bls12_381/fq2.rs
index 688710e7..ad744904 100644
--- a/zcash/src/librustzcash/algebra/curve/bls12_381/fq2.rs
+++ b/zcash/src/librustzcash/algebra/curve/bls12_381/fq2.rs
@@ -1,8 +1,8 @@
 use super::fq::{Fq, FROBENIUS_COEFF_FQ2_C1, NEGATIVE_ONE};
 use crate::librustzcash::algebra::field::{Field, LegendreSymbol, SqrtField};
 
+use core::cmp::Ordering;
 use rand_core::RngCore;
-use std::cmp::Ordering;
 
 /// An element of Fq2, represented by c0 + c1 * u.
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
@@ -11,8 +11,8 @@ pub struct Fq2 {
     pub c1: Fq,
 }
 
-impl ::std::fmt::Display for Fq2 {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+impl ::core::fmt::Display for Fq2 {
+    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
         write!(f, "Fq2({} + {} * u)", self.c0, self.c1)
     }
 }
diff --git a/zcash/src/librustzcash/algebra/curve/bls12_381/fq6.rs b/zcash/src/librustzcash/algebra/curve/bls12_381/fq6.rs
index 807c3aba..4a4d198b 100644
--- a/zcash/src/librustzcash/algebra/curve/bls12_381/fq6.rs
+++ b/zcash/src/librustzcash/algebra/curve/bls12_381/fq6.rs
@@ -12,8 +12,8 @@ pub struct Fq6 {
     pub c2: Fq2,
 }
 
-impl ::std::fmt::Display for Fq6 {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+impl ::core::fmt::Display for Fq6 {
+    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
         write!(f, "Fq6({} + {} * v, {} * v^2)", self.c0, self.c1, self.c2)
     }
 }
@@ -21,7 +21,7 @@ impl ::std::fmt::Display for Fq6 {
 impl Fq6 {
     /// Multiply by quadratic nonresidue v.
     pub fn mul_by_nonresidue(&mut self) {
-        use std::mem::swap;
+        use core::mem::swap;
         swap(&mut self.c0, &mut self.c1);
         swap(&mut self.c0, &mut self.c2);
 
diff --git a/zcash/src/librustzcash/algebra/curve/bls12_381/mod.rs b/zcash/src/librustzcash/algebra/curve/bls12_381/mod.rs
index b449e1ee..38b16314 100644
--- a/zcash/src/librustzcash/algebra/curve/bls12_381/mod.rs
+++ b/zcash/src/librustzcash/algebra/curve/bls12_381/mod.rs
@@ -22,6 +22,8 @@ use super::{Engine, PairingCurveAffine};
 use crate::librustzcash::algebra::field::{BitIterator, Field, ScalarEngine};
 use crate::librustzcash::algebra::group::CurveAffine;
 
+use wagyu_model::no_std::vec;
+
 // The BLS parameter x for BLS12-381 is -0xd201000000010000
 const BLS_X: u64 = 0xd201000000010000;
 const BLS_X_IS_NEGATIVE: bool = true;
diff --git a/zcash/src/librustzcash/algebra/field/field-derive/src/lib.rs b/zcash/src/librustzcash/algebra/field/field-derive/src/lib.rs
index 8290c7c3..839f2c76 100644
--- a/zcash/src/librustzcash/algebra/field/field-derive/src/lib.rs
+++ b/zcash/src/librustzcash/algebra/field/field-derive/src/lib.rs
@@ -1,14 +1,32 @@
 #![recursion_limit = "1024"]
+#![cfg_attr(not(feature = "std"), no_std)]
 
 extern crate proc_macro;
 #[macro_use]
 extern crate quote;
 
+use core::str::FromStr;
 use num_bigint::BigUint;
 use num_integer::Integer;
 use num_traits::{One, ToPrimitive, Zero};
 use quote::TokenStreamExt;
-use std::str::FromStr;
+
+#[cfg(not(feature = "std"))]
+#[allow(unused_imports)]
+#[doc(hidden)]
+#[macro_use]
+extern crate alloc;
+
+#[cfg(not(feature = "std"))]
+use alloc::{
+    string::{String, ToString},
+    vec::Vec,
+};
+#[cfg(feature = "std")]
+use std::{
+    string::{String, ToString},
+    vec::Vec,
+};
 
 #[proc_macro_derive(PrimeField, attributes(PrimeFieldModulus, PrimeFieldGenerator))]
 pub fn prime_field(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
@@ -113,9 +131,9 @@ fn prime_field_repr_impl(repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenS
         #[derive(Copy, Clone, PartialEq, Eq, Default)]
         pub struct #repr(pub [u64; #limbs]);
 
-        impl ::std::fmt::Debug for #repr
+        impl ::core::fmt::Debug for #repr
         {
-            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
                 write!(f, "0x")?;
                 for i in self.0.iter().rev() {
                     write!(f, "{:016x}", *i)?;
@@ -125,8 +143,8 @@ fn prime_field_repr_impl(repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenS
             }
         }
 
-        impl ::std::fmt::Display for #repr {
-            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        impl ::core::fmt::Display for #repr {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
                 write!(f, "0x")?;
                 for i in self.0.iter().rev() {
                     write!(f, "{:016x}", *i)?;
@@ -153,7 +171,7 @@ fn prime_field_repr_impl(repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenS
         impl From<u64> for #repr {
             #[inline(always)]
             fn from(val: u64) -> #repr {
-                use std::default::Default;
+                use core::default::Default;
 
                 let mut repr = Self::default();
                 repr.0[0] = val;
@@ -163,22 +181,22 @@ fn prime_field_repr_impl(repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenS
 
         impl Ord for #repr {
             #[inline(always)]
-            fn cmp(&self, other: &#repr) -> ::std::cmp::Ordering {
+            fn cmp(&self, other: &#repr) -> ::core::cmp::Ordering {
                 for (a, b) in self.0.iter().rev().zip(other.0.iter().rev()) {
                     if a < b {
-                        return ::std::cmp::Ordering::Less
+                        return ::core::cmp::Ordering::Less
                     } else if a > b {
-                        return ::std::cmp::Ordering::Greater
+                        return ::core::cmp::Ordering::Greater
                     }
                 }
 
-                ::std::cmp::Ordering::Equal
+                ::core::cmp::Ordering::Equal
             }
         }
 
         impl PartialOrd for #repr {
             #[inline(always)]
-            fn partial_cmp(&self, other: &#repr) -> Option<::std::cmp::Ordering> {
+            fn partial_cmp(&self, other: &#repr) -> Option<::core::cmp::Ordering> {
                 Some(self.cmp(other))
             }
         }
@@ -209,7 +227,7 @@ fn prime_field_repr_impl(repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenS
                 while n >= 64 {
                     let mut t = 0;
                     for i in self.0.iter_mut().rev() {
-                        ::std::mem::swap(&mut t, i);
+                        ::core::mem::swap(&mut t, i);
                     }
                     n -= 64;
                 }
@@ -257,7 +275,7 @@ fn prime_field_repr_impl(repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenS
                 while n >= 64 {
                     let mut t = 0;
                     for i in &mut self.0 {
-                        ::std::mem::swap(&mut t, i);
+                        ::core::mem::swap(&mut t, i);
                     }
                     n -= 64;
                 }
@@ -556,7 +574,11 @@ fn prime_field_constants_and_sqrt(
 fn prime_field_impl(name: &syn::Ident, repr: &syn::Ident, limbs: usize) -> proc_macro2::TokenStream {
     // Returns r{n} as an ident.
     fn get_temp(n: usize) -> syn::Ident {
-        syn::Ident::new(&format!("r{}", n), proc_macro2::Span::call_site())
+        #[cfg(not(feature = "std"))]
+        return syn::Ident::new(&alloc::format!("r{}", n), proc_macro2::Span::call_site());
+
+        #[cfg(feature = "std")]
+        return syn::Ident::new(&std::format!("r{}", n), proc_macro2::Span::call_site());
     }
 
     // The parameter list for the mont_reduce() internal method.
@@ -764,25 +786,25 @@ fn prime_field_impl(name: &syn::Ident, repr: &syn::Ident, limbs: usize) -> proc_
     let top_limb_index = limbs - 1;
 
     quote! {
-        impl ::std::marker::Copy for #name { }
+        impl ::core::marker::Copy for #name { }
 
-        impl ::std::clone::Clone for #name {
+        impl ::core::clone::Clone for #name {
             fn clone(&self) -> #name {
                 *self
             }
         }
 
-        impl ::std::cmp::PartialEq for #name {
+        impl ::core::cmp::PartialEq for #name {
             fn eq(&self, other: &#name) -> bool {
                 self.0 == other.0
             }
         }
 
-        impl ::std::cmp::Eq for #name { }
+        impl ::core::cmp::Eq for #name { }
 
-        impl ::std::fmt::Debug for #name
+        impl ::core::fmt::Debug for #name
         {
-            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
                 write!(f, "{}({:?})", stringify!(#name), self.into_repr())
             }
         }
@@ -790,20 +812,20 @@ fn prime_field_impl(name: &syn::Ident, repr: &syn::Ident, limbs: usize) -> proc_
         /// Elements are ordered lexicographically.
         impl Ord for #name {
             #[inline(always)]
-            fn cmp(&self, other: &#name) -> ::std::cmp::Ordering {
+            fn cmp(&self, other: &#name) -> ::core::cmp::Ordering {
                 self.into_repr().cmp(&other.into_repr())
             }
         }
 
         impl PartialOrd for #name {
             #[inline(always)]
-            fn partial_cmp(&self, other: &#name) -> Option<::std::cmp::Ordering> {
+            fn partial_cmp(&self, other: &#name) -> Option<::core::cmp::Ordering> {
                 Some(self.cmp(other))
             }
         }
 
-        impl ::std::fmt::Display for #name {
-            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        impl ::core::fmt::Display for #name {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
                 write!(f, "{}({})", stringify!(#name), self.into_repr())
             }
         }
@@ -824,7 +846,11 @@ fn prime_field_impl(name: &syn::Ident, repr: &syn::Ident, limbs: usize) -> proc_
 
                     Ok(r)
                 } else {
-                    Err(PrimeFieldDecodingError::NotInField(format!("{}", r.0)))
+                    #[cfg(not(feature = "std"))]
+                    return Err(PrimeFieldDecodingError::NotInField(alloc::format!("{}", r.0)));
+
+                    #[cfg(feature = "std")]
+                    return Err(PrimeFieldDecodingError::NotInField(std::format!("{}", r.0)));
                 }
             }
 
diff --git a/zcash/src/librustzcash/algebra/field/mod.rs b/zcash/src/librustzcash/algebra/field/mod.rs
index 59e8d0c0..72aabb38 100644
--- a/zcash/src/librustzcash/algebra/field/mod.rs
+++ b/zcash/src/librustzcash/algebra/field/mod.rs
@@ -1,9 +1,10 @@
 pub use field_derive::*;
 
+use core::fmt;
 use rand_core::RngCore;
-use std::error::Error;
-use std::fmt;
-use std::io::{self, Read, Write};
+
+use wagyu_model::no_std::io::{self, Read, Write};
+use wagyu_model::no_std::String;
 
 /// This trait represents an element of a field.
 pub trait Field: Sized + Eq + Copy + Clone + Send + Sync + fmt::Debug + fmt::Display + 'static {
@@ -183,28 +184,13 @@ pub enum LegendreSymbol {
 
 /// An error that may occur when trying to interpret a `PrimeFieldRepr` as a
 /// `PrimeField` element.
-#[derive(Debug)]
+#[derive(Debug, Fail)]
 pub enum PrimeFieldDecodingError {
     /// The encoded value is not in the field
+    #[fail(display = "{} is not an element of the field", _0)]
     NotInField(String),
 }
 
-impl Error for PrimeFieldDecodingError {
-    fn description(&self) -> &str {
-        match *self {
-            PrimeFieldDecodingError::NotInField(..) => "not an element of the field",
-        }
-    }
-}
-
-impl fmt::Display for PrimeFieldDecodingError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-        match *self {
-            PrimeFieldDecodingError::NotInField(ref repr) => write!(f, "{} is not an element of the field", repr),
-        }
-    }
-}
-
 /// This represents an element of a prime field.
 pub trait PrimeField: Field {
     /// The prime field can be converted back and forth into this biginteger
diff --git a/zcash/src/librustzcash/algebra/group/mod.rs b/zcash/src/librustzcash/algebra/group/mod.rs
index 4a99c632..fa4815bc 100644
--- a/zcash/src/librustzcash/algebra/group/mod.rs
+++ b/zcash/src/librustzcash/algebra/group/mod.rs
@@ -1,8 +1,7 @@
 use crate::librustzcash::algebra::field::{PrimeField, PrimeFieldDecodingError, ScalarEngine, SqrtField};
 
+use core::fmt;
 use rand::RngCore;
-use std::error::Error;
-use std::fmt;
 
 #[cfg(test)]
 pub mod tests;
@@ -144,39 +143,21 @@ pub trait EncodedPoint: Sized + Send + Sync + AsRef<[u8]> + AsMut<[u8]> + Clone
 }
 
 /// An error that may occur when trying to decode an `EncodedPoint`.
-#[derive(Debug)]
+#[derive(Debug, Fail)]
 pub enum GroupDecodingError {
     /// The coordinate(s) do not lie on the curve.
+    #[fail(display = "coordinate(s) do not lie on the curve")]
     NotOnCurve,
     /// The element is not part of the r-order subgroup.
+    #[fail(display = "the element is not part of an r-order subgroup")]
     NotInSubgroup,
     /// One of the coordinates could not be decoded
+    #[fail(display = "{} decoding error: {}", _0, _1)]
     CoordinateDecodingError(&'static str, PrimeFieldDecodingError),
     /// The compression mode of the encoded element was not as expected
+    #[fail(display = "encoding has unexpected compression mode")]
     UnexpectedCompressionMode,
     /// The encoding contained bits that should not have been set
+    #[fail(display = "encoding has unexpected information")]
     UnexpectedInformation,
 }
-
-impl Error for GroupDecodingError {
-    fn description(&self) -> &str {
-        match *self {
-            GroupDecodingError::NotOnCurve => "coordinate(s) do not lie on the curve",
-            GroupDecodingError::NotInSubgroup => "the element is not part of an r-order subgroup",
-            GroupDecodingError::CoordinateDecodingError(..) => "coordinate(s) could not be decoded",
-            GroupDecodingError::UnexpectedCompressionMode => "encoding has unexpected compression mode",
-            GroupDecodingError::UnexpectedInformation => "encoding has unexpected information",
-        }
-    }
-}
-
-impl fmt::Display for GroupDecodingError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-        match *self {
-            GroupDecodingError::CoordinateDecodingError(description, ref err) => {
-                write!(f, "{} decoding error: {}", description, err)
-            }
-            _ => write!(f, "{}", self.description()),
-        }
-    }
-}
diff --git a/zcash/src/librustzcash/sapling_crypto/jubjub/edwards.rs b/zcash/src/librustzcash/sapling_crypto/jubjub/edwards.rs
index 0b378f3f..c9562b12 100644
--- a/zcash/src/librustzcash/sapling_crypto/jubjub/edwards.rs
+++ b/zcash/src/librustzcash/sapling_crypto/jubjub/edwards.rs
@@ -3,9 +3,8 @@ use crate::librustzcash::sapling_crypto::jubjub::{montgomery, JubjubEngine, Jubj
 
 use rand_core::RngCore;
 
-use std::marker::PhantomData;
-
-use std::io::{self, Read, Write};
+use core::marker::PhantomData;
+use wagyu_model::no_std::io::{self, Read, Write};
 
 // Represents the affine point (X/Z, Y/Z) via the extended
 // twisted Edwards coordinates.
diff --git a/zcash/src/librustzcash/sapling_crypto/jubjub/fs.rs b/zcash/src/librustzcash/sapling_crypto/jubjub/fs.rs
index 026be6dc..b4ed613b 100644
--- a/zcash/src/librustzcash/sapling_crypto/jubjub/fs.rs
+++ b/zcash/src/librustzcash/sapling_crypto/jubjub/fs.rs
@@ -7,6 +7,8 @@ use crate::librustzcash::algebra::field::{
 use byteorder::{ByteOrder, LittleEndian};
 use rand_core::RngCore;
 
+use wagyu_model::no_std::format;
+
 use super::ToUniform;
 
 // s = 6554484396890773809930967563523245729705921265872317281365359162392183254199
@@ -74,8 +76,8 @@ const NEGATIVE_ONE: Fs = Fs(FsRepr([
 #[derive(Copy, Clone, PartialEq, Eq, Default, Debug)]
 pub struct FsRepr(pub [u64; 4]);
 
-impl ::std::fmt::Display for FsRepr {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+impl ::core::fmt::Display for FsRepr {
+    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
         write!(f, "0x")?;
         for i in self.0.iter().rev() {
             write!(f, "{:016x}", *i)?;
@@ -110,22 +112,22 @@ impl From<u64> for FsRepr {
 
 impl Ord for FsRepr {
     #[inline(always)]
-    fn cmp(&self, other: &FsRepr) -> ::std::cmp::Ordering {
+    fn cmp(&self, other: &FsRepr) -> ::core::cmp::Ordering {
         for (a, b) in self.0.iter().rev().zip(other.0.iter().rev()) {
             if a < b {
-                return ::std::cmp::Ordering::Less;
+                return ::core::cmp::Ordering::Less;
             } else if a > b {
-                return ::std::cmp::Ordering::Greater;
+                return ::core::cmp::Ordering::Greater;
             }
         }
 
-        ::std::cmp::Ordering::Equal
+        ::core::cmp::Ordering::Equal
     }
 }
 
 impl PartialOrd for FsRepr {
     #[inline(always)]
-    fn partial_cmp(&self, other: &FsRepr) -> Option<::std::cmp::Ordering> {
+    fn partial_cmp(&self, other: &FsRepr) -> Option<::core::cmp::Ordering> {
         Some(self.cmp(other))
     }
 }
@@ -156,7 +158,7 @@ impl PrimeFieldRepr for FsRepr {
         while n >= 64 {
             let mut t = 0;
             for i in self.0.iter_mut().rev() {
-                ::std::mem::swap(&mut t, i);
+                ::core::mem::swap(&mut t, i);
             }
             n -= 64;
         }
@@ -204,7 +206,7 @@ impl PrimeFieldRepr for FsRepr {
         while n >= 64 {
             let mut t = 0;
             for i in &mut self.0 {
-                ::std::mem::swap(&mut t, i);
+                ::core::mem::swap(&mut t, i);
             }
             n -= 64;
         }
@@ -257,8 +259,8 @@ impl PrimeFieldRepr for FsRepr {
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub struct Fs(FsRepr);
 
-impl ::std::fmt::Display for Fs {
-    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+impl ::core::fmt::Display for Fs {
+    fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
         write!(f, "Fs({})", self.into_repr())
     }
 }
@@ -661,7 +663,7 @@ use rand_xorshift::XorShiftRng;
 fn test_fs_repr_ordering() {
     fn assert_equality(a: FsRepr, b: FsRepr) {
         assert_eq!(a, b);
-        assert!(a.cmp(&b) == ::std::cmp::Ordering::Equal);
+        assert!(a.cmp(&b) == ::core::cmp::Ordering::Equal);
     }
 
     fn assert_lt(a: FsRepr, b: FsRepr) {
diff --git a/zcash/src/librustzcash/sapling_crypto/jubjub/mod.rs b/zcash/src/librustzcash/sapling_crypto/jubjub/mod.rs
index 92760185..9efd4146 100644
--- a/zcash/src/librustzcash/sapling_crypto/jubjub/mod.rs
+++ b/zcash/src/librustzcash/sapling_crypto/jubjub/mod.rs
@@ -23,6 +23,8 @@ use crate::librustzcash::algebra::field::{Field, PrimeField, SqrtField};
 use crate::librustzcash::sapling_crypto::constants;
 use crate::librustzcash::sapling_crypto::group_hash::group_hash;
 
+use wagyu_model::no_std::{vec, Vec};
+
 /// This is an implementation of the twisted Edwards Jubjub curve.
 pub mod edwards;
 
diff --git a/zcash/src/librustzcash/sapling_crypto/jubjub/montgomery.rs b/zcash/src/librustzcash/sapling_crypto/jubjub/montgomery.rs
index 80f808a4..33395470 100644
--- a/zcash/src/librustzcash/sapling_crypto/jubjub/montgomery.rs
+++ b/zcash/src/librustzcash/sapling_crypto/jubjub/montgomery.rs
@@ -1,8 +1,8 @@
 use crate::librustzcash::algebra::field::{BitIterator, Field, PrimeField, PrimeFieldRepr, SqrtField};
 use crate::librustzcash::sapling_crypto::jubjub::{edwards, JubjubEngine, JubjubParams, PrimeOrder, Unknown};
 
+use core::marker::PhantomData;
 use rand_core::RngCore;
-use std::marker::PhantomData;
 
 // Represents the affine point (X, Y)
 pub struct Point<E: JubjubEngine, Subgroup> {
diff --git a/zcash/src/librustzcash/sapling_crypto/pedersen_hash.rs b/zcash/src/librustzcash/sapling_crypto/pedersen_hash.rs
index 4c265818..9d1b0417 100644
--- a/zcash/src/librustzcash/sapling_crypto/pedersen_hash.rs
+++ b/zcash/src/librustzcash/sapling_crypto/pedersen_hash.rs
@@ -1,6 +1,8 @@
 use crate::librustzcash::algebra::field::{Field, PrimeField, PrimeFieldRepr};
 use crate::librustzcash::sapling_crypto::jubjub::*;
 
+use wagyu_model::no_std::{vec, Vec};
+
 #[derive(Copy, Clone)]
 pub enum Personalization {
     NoteCommitment,
diff --git a/zcash/src/librustzcash/sapling_crypto/primitives/mod.rs b/zcash/src/librustzcash/sapling_crypto/primitives/mod.rs
index 6d7da8c3..106d76dc 100644
--- a/zcash/src/librustzcash/sapling_crypto/primitives/mod.rs
+++ b/zcash/src/librustzcash/sapling_crypto/primitives/mod.rs
@@ -8,6 +8,8 @@ use byteorder::{LittleEndian, WriteBytesExt};
 
 use blake2s_simd::Params as Blake2sParams;
 
+use wagyu_model::no_std::{vec, Vec};
+
 #[derive(Clone)]
 pub struct ValueCommitment<E: JubjubEngine> {
     pub value: u64,
diff --git a/zcash/src/librustzcash/zip32.rs b/zcash/src/librustzcash/zip32.rs
index c57b419e..8893249b 100644
--- a/zcash/src/librustzcash/zip32.rs
+++ b/zcash/src/librustzcash/zip32.rs
@@ -8,14 +8,15 @@ use crate::librustzcash::JUBJUB;
 use crate::network::ZcashNetwork;
 use crate::private_key::{SaplingOutgoingViewingKey, SaplingSpendingKey};
 use crate::public_key::SaplingFullViewingKey;
+use wagyu_model::no_std::io::{self, Read, Write};
+use wagyu_model::no_std::vec;
 use wagyu_model::ChildIndex;
 
 use aes::Aes256;
 use blake2b_simd::{Hash as Blake2bHash, Params as Blake2bParams};
 use byteorder::{ByteOrder, LittleEndian, ReadBytesExt, WriteBytesExt};
+use core::marker::PhantomData;
 use fpe::ff1::{BinaryNumeralString, FF1};
-use std::io::{self, Read, Write};
-use std::marker::PhantomData;
 
 pub const ZIP32_SAPLING_MASTER_PERSONALIZATION: &'static [u8; 16] = b"ZcashIP32Sapling";
 pub const ZIP32_SAPLING_FVFP_PERSONALIZATION: &'static [u8; 16] = b"ZcashSaplingFVFP";
@@ -274,7 +275,7 @@ impl<N: ZcashNetwork> ExtendedSpendingKey<N> {
     }
 }
 
-impl<N: ZcashNetwork> std::cmp::PartialEq for ExtendedSpendingKey<N> {
+impl<N: ZcashNetwork> core::cmp::PartialEq for ExtendedSpendingKey<N> {
     fn eq(&self, rhs: &ExtendedSpendingKey<N>) -> bool {
         self.depth == rhs.depth
             && self.parent_fvk_tag == rhs.parent_fvk_tag
@@ -287,8 +288,8 @@ impl<N: ZcashNetwork> std::cmp::PartialEq for ExtendedSpendingKey<N> {
     }
 }
 
-impl<N: ZcashNetwork> std::fmt::Debug for ExtendedSpendingKey<N> {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+impl<N: ZcashNetwork> core::fmt::Debug for ExtendedSpendingKey<N> {
+    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
         write!(
             f,
             "ExtendedSpendingKey(d = {}, tag_p = {:?}, i = {:?})",
@@ -397,7 +398,7 @@ impl<N: ZcashNetwork> ExtendedFullViewingKey<N> {
     }
 }
 
-impl<N: ZcashNetwork> std::cmp::PartialEq for ExtendedFullViewingKey<N> {
+impl<N: ZcashNetwork> core::cmp::PartialEq for ExtendedFullViewingKey<N> {
     fn eq(&self, rhs: &Self) -> bool {
         self.depth == rhs.depth
             && self.parent_fvk_tag == rhs.parent_fvk_tag
@@ -410,8 +411,8 @@ impl<N: ZcashNetwork> std::cmp::PartialEq for ExtendedFullViewingKey<N> {
     }
 }
 
-impl<N: ZcashNetwork> std::fmt::Debug for ExtendedFullViewingKey<N> {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+impl<N: ZcashNetwork> core::fmt::Debug for ExtendedFullViewingKey<N> {
+    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
         write!(
             f,
             "ExtendedFullViewingKey(d = {}, tag_p = {:?}, i = {:?})",
diff --git a/zcash/src/network/mainnet.rs b/zcash/src/network/mainnet.rs
index 0b8ffd74..02381e73 100644
--- a/zcash/src/network/mainnet.rs
+++ b/zcash/src/network/mainnet.rs
@@ -1,9 +1,10 @@
 use super::*;
 use crate::format::ZcashFormat;
+use wagyu_model::no_std::vec;
 use wagyu_model::{AddressError, ChildIndex, Network, NetworkError, PrivateKeyError};
 
+use core::{fmt, str::FromStr};
 use serde::Serialize;
-use std::{fmt, str::FromStr};
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize)]
 pub struct Mainnet;
diff --git a/zcash/src/network/mod.rs b/zcash/src/network/mod.rs
index 628696ba..9c200570 100644
--- a/zcash/src/network/mod.rs
+++ b/zcash/src/network/mod.rs
@@ -1,4 +1,5 @@
 use crate::format::ZcashFormat;
+use wagyu_model::no_std::{String, Vec};
 use wagyu_model::{AddressError, ChildIndex, Network, NetworkError, PrivateKeyError};
 
 pub mod mainnet;
diff --git a/zcash/src/network/testnet.rs b/zcash/src/network/testnet.rs
index 898362e1..ee89e82d 100644
--- a/zcash/src/network/testnet.rs
+++ b/zcash/src/network/testnet.rs
@@ -1,9 +1,10 @@
 use super::*;
 use crate::format::ZcashFormat;
+use wagyu_model::no_std::vec;
 use wagyu_model::{AddressError, ChildIndex, Network, NetworkError, PrivateKeyError};
 
+use core::{fmt, str::FromStr};
 use serde::Serialize;
-use std::{fmt, str::FromStr};
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize)]
 pub struct Testnet;
 
diff --git a/zcash/src/private_key.rs b/zcash/src/private_key.rs
index fd8c5978..7c423099 100644
--- a/zcash/src/private_key.rs
+++ b/zcash/src/private_key.rs
@@ -9,19 +9,23 @@ use crate::librustzcash::sapling_crypto::{
 use crate::librustzcash::zip32::prf_expand;
 use crate::network::ZcashNetwork;
 use crate::public_key::ZcashPublicKey;
+use wagyu_model::no_std::{
+    io::{self, Read, Write},
+    vec, String, ToString, Vec,
+};
 use wagyu_model::{crypto::checksum, Address, AddressError, PrivateKey, PrivateKeyError, PublicKey};
 
 use base58::{FromBase58, ToBase58};
 use bech32::{Bech32, FromBase32, ToBase32};
-use rand::Rng;
-use secp256k1;
-use std::{
+use core::{
     cmp::{Eq, PartialEq},
     fmt::{self, Debug, Display},
-    io::{self, Read, Write},
     marker::PhantomData,
     str::FromStr,
 };
+use failure::AsFail;
+use rand::Rng;
+use secp256k1;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct P2PKHSpendingKey<N: ZcashNetwork> {
@@ -150,12 +154,12 @@ impl<N: ZcashNetwork> SaplingSpendingKey<N> {
         let mut ask_repr = <<Bls12 as JubjubEngine>::Fs as PrimeField>::Repr::default();
         ask_repr.read_le(&mut reader)?;
         let ask = <Bls12 as JubjubEngine>::Fs::from_repr(ask_repr)
-            .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;
+            .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e.as_fail().to_string()))?;
 
         let mut nsk_repr = <<Bls12 as JubjubEngine>::Fs as PrimeField>::Repr::default();
         nsk_repr.read_le(&mut reader)?;
         let nsk = <Bls12 as JubjubEngine>::Fs::from_repr(nsk_repr)
-            .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))?;
+            .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e.as_fail().to_string()))?;
 
         let mut ovk = [0; 32];
         reader.read_exact(&mut ovk)?;
diff --git a/zcash/src/public_key.rs b/zcash/src/public_key.rs
index b02f6139..23f2e78e 100644
--- a/zcash/src/public_key.rs
+++ b/zcash/src/public_key.rs
@@ -8,19 +8,22 @@ use crate::librustzcash::sapling_crypto::{
 use crate::librustzcash::JUBJUB;
 use crate::network::ZcashNetwork;
 use crate::private_key::{SaplingOutgoingViewingKey, SaplingSpendingKey, ZcashPrivateKey};
+use wagyu_model::no_std::{
+    io::{self, Read, Write},
+    ToString, Vec,
+};
 use wagyu_model::{crypto::checksum, Address, AddressError, PublicKey, PublicKeyError};
 
 use base58::{FromBase58, ToBase58};
 use bech32::{Bech32, FromBase32, ToBase32};
-use crypto::sha2::sha256_digest_block;
-use secp256k1;
-use std::{
+use core::{
     cmp::{Eq, PartialEq},
     fmt::{self, Display},
-    io::{self, Read, Write},
     marker::PhantomData,
     str::FromStr,
 };
+use crypto::sha2::sha256_digest_block;
+use secp256k1;
 
 static H256: [u32; 8] = [
     0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19,
@@ -207,9 +210,7 @@ impl<N: ZcashNetwork> PublicKey for ZcashPublicKey<N> {
         match private_key {
             // Transparent Public Key
             ZcashPrivateKey::<N>::P2PKH(spending_key) => ZcashPublicKey::<N>::P2PKH(P2PKHViewingKey {
-                public_key: secp256k1::PublicKey::from_secret_key(
-                    &spending_key.secret_key,
-                ),
+                public_key: secp256k1::PublicKey::from_secret_key(&spending_key.secret_key),
                 compressed: spending_key.compressed,
             }),
             // Transparent Multisignature
diff --git a/zcash/src/transaction.rs b/zcash/src/transaction.rs
index 5dac3e62..0d41cf12 100644
--- a/zcash/src/transaction.rs
+++ b/zcash/src/transaction.rs
@@ -6,16 +6,21 @@ use crate::librustzcash::zip32::prf_expand;
 use crate::network::ZcashNetwork;
 use crate::private_key::{SaplingOutgoingViewingKey, ZcashPrivateKey};
 use crate::public_key::ZcashPublicKey;
+use wagyu_model::no_std::{
+    format,
+    io::{self, BufReader, Read},
+    vec, String, ToString, Vec,
+};
 use wagyu_model::{ExtendedPrivateKey, PrivateKey, Transaction, TransactionError, TransactionId};
 
 use base58::FromBase58;
 use blake2b_simd::{Hash, Params, State};
+use core::{fmt, str::FromStr};
 use rand::{rngs::StdRng, Rng};
 use rand_core::SeedableRng;
 use secp256k1;
 use serde::Serialize;
 use sha2::{Digest, Sha256};
-use std::{fmt, io::{self, BufReader, Read}, str::FromStr};
 
 // librustzcash crates
 use bellman::groth16::{prepare_verifying_key, Parameters, PreparedVerifyingKey, Proof};
@@ -137,24 +142,21 @@ pub fn load_sapling_parameters() -> (
     let (spend, output) = wagyu_zcash_parameters::load_sapling_parameters();
 
     let mut spend_fs = HashReader::new(BufReader::with_capacity(1024 * 1024, &spend[..]));
-    let mut output_fs =
-        HashReader::new(BufReader::with_capacity(1024 * 1024, &output[..]));
+    let mut output_fs = HashReader::new(BufReader::with_capacity(1024 * 1024, &output[..]));
 
     // Deserialize params
-    let spend_params = Parameters::<Bls12>::read(&mut spend_fs, false)
-        .expect("couldn't deserialize Sapling spend parameters file");
-    let output_params = Parameters::<Bls12>::read(&mut output_fs, false)
-        .expect("couldn't deserialize Sapling spend parameters file");
+    let spend_params =
+        Parameters::<Bls12>::read(&mut spend_fs, false).expect("couldn't deserialize Sapling spend parameters file");
+    let output_params =
+        Parameters::<Bls12>::read(&mut output_fs, false).expect("couldn't deserialize Sapling spend parameters file");
 
     // There is extra stuff (the transcript) at the end of the parameter file which is
     // used to verify the parameter validity, but we're not interested in that. We do
     // want to read it, though, so that the BLAKE2b computed afterward is consistent
     // with `b2sum` on the files.
     let mut sink = io::sink();
-    io::copy(&mut spend_fs, &mut sink)
-        .expect("couldn't finish reading Sapling spend parameter file");
-    io::copy(&mut output_fs, &mut sink)
-        .expect("couldn't finish reading Sapling output parameter file");
+    io::copy(&mut spend_fs, &mut sink).expect("couldn't finish reading Sapling spend parameter file");
+    io::copy(&mut output_fs, &mut sink).expect("couldn't finish reading Sapling output parameter file");
 
     if spend_fs.into_hash() != "8270785a1a0d0bc77196f000ee6d221c9c9894f55307bd9357c3f0105d31ca63991ab91324160d8f53e2bbd3c2633a6eb8bdf5205d822e7f3f73edac51b2b70c" {
         panic!("Sapling spend parameter is not correct. please file a Github issue.");
@@ -1251,7 +1253,7 @@ impl<N: ZcashNetwork> Transaction for ZcashTransaction<N> {
                             &p2pkh_spending_key.to_secp256k1_secret_key(),
                         );
                         signature.serialize_der().as_ref().to_vec()
-                    },
+                    }
                     _ => unimplemented!(),
                 };
                 signature.push((input.sighash_code as u32).to_le_bytes()[0]);
@@ -1261,10 +1263,7 @@ impl<N: ZcashNetwork> Transaction for ZcashTransaction<N> {
                 let public_viewing_key = match private_key.to_public_key() {
                     ZcashPublicKey::<N>::P2PKH(p2pkh_view_key) => match p2pkh_view_key.is_compressed() {
                         true => p2pkh_view_key.to_secp256k1_public_key().serialize_compressed().to_vec(),
-                        false => p2pkh_view_key
-                            .to_secp256k1_public_key()
-                            .serialize()
-                            .to_vec(),
+                        false => p2pkh_view_key.to_secp256k1_public_key().serialize().to_vec(),
                     },
                     _ => unimplemented!(),
                 };
@@ -1593,7 +1592,7 @@ mod tests {
     use crate::{Mainnet, Testnet};
 
     use bellman::groth16::PreparedVerifyingKey;
-    use zcash_primitives::merkle_tree::{CommitmentTree, MerklePath, IncrementalWitness};
+    use zcash_primitives::merkle_tree::{CommitmentTree, IncrementalWitness, MerklePath};
 
     #[derive(Clone)]
     pub struct TransactionData<'a> {
@@ -2777,7 +2776,6 @@ mod tests {
             fn test_real_sapling_spend_transactions() {
                 test_sapling_transactions::<N>(REAL_TESTNET_SAPLING_SPEND_TRANSACTIONS.to_vec());
             }
-
         }
 
         mod test_real_testnet_sapling_output_transactions {