diff --git a/Sources/HDWalletKit/Core/Crypto/Encryption/ECDSA.swift b/Sources/HDWalletKit/Core/Crypto/Encryption/ECDSA.swift
index 201bc32..8aeae38 100755
--- a/Sources/HDWalletKit/Core/Crypto/Encryption/ECDSA.swift
+++ b/Sources/HDWalletKit/Core/Crypto/Encryption/ECDSA.swift
@@ -44,18 +44,16 @@ public final class ECDSA {
     
     public func verifySignature(_ sigData: Data, message: Data, publicKeyData: Data) throws -> Bool {
         guard let ctx = secp256k1_context_create(UInt32(SECP256K1_CONTEXT_VERIFY)) else { return false }
+        defer { secp256k1_context_destroy(ctx) }
         var pubkey = secp256k1_pubkey()
         var signature = secp256k1_ecdsa_signature()
-        secp256k1_ecdsa_signature_parse_der(ctx, &signature, sigData.bytes, sigData.count)
-        
-        if (secp256k1_ec_pubkey_parse(ctx, &pubkey, publicKeyData.bytes, publicKeyData.count) != 1) {
+        secp256k1_ecdsa_signature_parse_der(ctx, &signature, [UInt8](sigData), sigData.count)
+        if (secp256k1_ec_pubkey_parse(ctx, &pubkey, [UInt8](publicKeyData), publicKeyData.count) != 1) {
             return false
         };
-        
-        if (secp256k1_ecdsa_verify(ctx, &signature, message.bytes, &pubkey) != 1) {
+        if (secp256k1_ecdsa_verify(ctx, &signature, [UInt8](message), &pubkey) != 1) {
             return false
         };
-        secp256k1_context_destroy(ctx);
         return true
     }
 }
diff --git a/Sources/HDWalletKit/Core/Crypto/Encryption/EllipticCurveEncrypterSecp256k1.swift b/Sources/HDWalletKit/Core/Crypto/Encryption/EllipticCurveEncrypterSecp256k1.swift
index 2f6f0e1..c0c19b5 100644
--- a/Sources/HDWalletKit/Core/Crypto/Encryption/EllipticCurveEncrypterSecp256k1.swift
+++ b/Sources/HDWalletKit/Core/Crypto/Encryption/EllipticCurveEncrypterSecp256k1.swift
@@ -28,7 +28,7 @@ public class EllipticCurveEncrypterSecp256k1 {
     ///   - privateKey: private key bytes
     /// - Returns: public key structure
     public func createPublicKey(privateKey: Data) -> secp256k1_pubkey {
-        let privateKey = privateKey.bytes
+        let privateKey = [UInt8](privateKey)
         var publickKey = secp256k1_pubkey()
         _ = SecpResult(secp256k1_ec_pubkey_create(context, &publickKey, privateKey))
         return publickKey
@@ -94,8 +94,8 @@ public class EllipticCurveEncrypterSecp256k1 {
     ///   - hash: 32-byte (256-bit) hash of a message
     /// - Returns: public key structure or nil, if signature invalid
     public func publicKey(signature: inout secp256k1_ecdsa_recoverable_signature, hash: Data) -> secp256k1_pubkey? {
+        let hash = [UInt8](hash)
         precondition(hash.count == 32, "Hash must be 32 bytes size")
-        let hash = hash.bytes
         var outPubKey = secp256k1_pubkey()
         let status = SecpResult(secp256k1_ecdsa_recover(context, &outPubKey, &signature, hash))
         return status == .success ? outPubKey : nil
diff --git a/Sources/HDWalletKit/Mnemonic/Mnemonic.swift b/Sources/HDWalletKit/Mnemonic/Mnemonic.swift
index 932911e..dc50ea9 100755
--- a/Sources/HDWalletKit/Mnemonic/Mnemonic.swift
+++ b/Sources/HDWalletKit/Mnemonic/Mnemonic.swift
@@ -47,8 +47,7 @@ public final class Mnemonic {
         guard let salt = ("mnemonic" + passphrase).decomposedStringWithCompatibilityMapping.data(using: .utf8) else {
             fatalError("Nomalizing salt failed in \(self)")
         }
-        
-        return Crypto.PBKDF2SHA512(password: password.bytes, salt: salt.bytes)
+        return Crypto.PBKDF2SHA512(password: [UInt8](password), salt: [UInt8](salt))
     }
 }