diff --git a/ethers.xcodeproj/project.pbxproj b/ethers.xcodeproj/project.pbxproj
index 5d80d7c..5abafec 100644
--- a/ethers.xcodeproj/project.pbxproj
+++ b/ethers.xcodeproj/project.pbxproj
@@ -823,7 +823,7 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = ethers/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MACH_O_TYPE = staticlib;
 				OTHER_LDFLAGS = "";
@@ -845,7 +845,7 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = ethers/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 10.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MACH_O_TYPE = staticlib;
 				OTHER_LDFLAGS = "";
diff --git a/ethers/src/Account.m b/ethers/src/Account.m
index 719f1ae..3202ce7 100644
--- a/ethers/src/Account.m
+++ b/ethers/src/Account.m
@@ -113,7 +113,7 @@ - (void)cancel {
 
 @interface Signature (private)
 
-+ (instancetype)signatureWithData: (NSData*)data v: (char)v;
++ (instancetype)signatureWithData: (NSData*)data v: (int)v;
 
 @end
 
diff --git a/ethers/src/Signature.h b/ethers/src/Signature.h
index 8eef620..5087d6a 100644
--- a/ethers/src/Signature.h
+++ b/ethers/src/Signature.h
@@ -31,6 +31,6 @@
 
 @property (nonatomic, readonly) NSData* r;
 @property (nonatomic, readonly) NSData* s;
-@property (nonatomic, readonly) char v;
+@property (nonatomic, readonly) int v;
 
 @end
diff --git a/ethers/src/Signature.m b/ethers/src/Signature.m
index ea8cd62..fe78903 100644
--- a/ethers/src/Signature.m
+++ b/ethers/src/Signature.m
@@ -29,7 +29,7 @@
 
 @implementation Signature
 
-- (instancetype)initWithR: (NSData*)r s: (NSData*)s v: (char)v {
+- (instancetype)initWithR: (NSData*)r s: (NSData*)s v: (int)v {
     if (r.length != 32 || s.length != 32) { return nil; }
     self = [super init];
     if (self) {
@@ -40,7 +40,7 @@ - (instancetype)initWithR: (NSData*)r s: (NSData*)s v: (char)v {
     return self;
 }
 
-- (instancetype)initWithData: (NSData*)data v: (char)v {
+- (instancetype)initWithData: (NSData*)data v: (int)v {
     if (data.length != 64) { return nil; }
     
     return [self initWithR:[data subdataWithRange:NSMakeRange(0, 32)]
@@ -48,7 +48,7 @@ - (instancetype)initWithData: (NSData*)data v: (char)v {
                          v:v];
 }
 
-+ (instancetype)signatureWithData: (NSData*)data v:(char)v {
++ (instancetype)signatureWithData: (NSData*)data v:(int)v {
     return [[Signature alloc] initWithData:data v:v];
 }
 
diff --git a/ethers/src/Transaction.h b/ethers/src/Transaction.h
index 9b0aa27..aa9ae45 100644
--- a/ethers/src/Transaction.h
+++ b/ethers/src/Transaction.h
@@ -45,13 +45,13 @@
  *  See: https://github.com/ethereum/EIPs/issues/155
  */
 
-typedef NS_OPTIONS(unsigned char, ChainId)  {
-    ChianIdAny          = 0x00,
-    ChainIdHomestead    = 0x01,
-    ChainIdMorden       = 0x02,
-    ChainIdRopsten      = 0x03,
-    ChainIdRinkeby      = 0x04,
-    ChainIdKovan        = 0x2a,
+typedef NS_OPTIONS(int, ChainId)  {
+    ChianIdAny          = 0,
+    ChainIdHomestead    = 1,
+    ChainIdMorden       = 2,
+    ChainIdRopsten      = 3,
+    ChainIdRinkeby      = 4,
+    ChainIdKovan        = 42,
 };
 
 extern NSString * _Nullable chainName(ChainId chainId);
diff --git a/ethers/src/Transaction.m b/ethers/src/Transaction.m
index 9c2dac5..32be818 100644
--- a/ethers/src/Transaction.m
+++ b/ethers/src/Transaction.m
@@ -42,8 +42,9 @@
     return [data subdataWithRange:NSMakeRange(offset, data.length - offset)];
 }
 
-static NSData *dataWithByte(unsigned char value) {
-    return [NSMutableData dataWithBytes:&value length:1];
+static NSData *dataWithByte(int value,bool isLocalValue) {
+    int tmpValue = CFSwapInt32(value);
+    return [NSMutableData dataWithBytes:isLocalValue ? &value : &tmpValue length:isLocalValue ? 1 : sizeof(tmpValue)];
 }
 
 NSString *chainName(ChainId chainId) {
@@ -67,7 +68,7 @@
 
 @interface Signature (private)
 
-+ (instancetype)signatureWithData: (NSData*)data v: (char)v;
++ (instancetype)signatureWithData: (NSData*)data v: (int)v;
 
 @end
 
@@ -173,7 +174,7 @@ + (instancetype)transactionWithData: (NSData*)transactionData {
         NSData *vObject = [raw objectAtIndex:6];
         if (vObject.length > 1) { return nil; }
         
-        unsigned char v = 0;
+        int v = 0;
         if (vObject.length == 1) {
             [vObject getBytes:&v range:NSMakeRange(0, 1)];
         }
@@ -233,7 +234,7 @@ - (void)sign:(Account *)account {
     if (account) {
         NSMutableArray *raw = [self _packBasic];
         if (_chainId) {
-            [raw addObject:dataWithByte(_chainId)];
+            [raw addObject:dataWithByte(_chainId,chainName(_chainId))];
             [raw addObject:NullData];
             [raw addObject:NullData];
         }
@@ -249,7 +250,7 @@ - (void)sign:(Account *)account {
     }
 }
 
-- (void)verifySignatureData: (NSData*)signatureData v: (unsigned char)v {
+- (void)verifySignatureData: (NSData*)signatureData v: (int)v {
     _signature = [Signature signatureWithData:signatureData v:v];
 
     // Use an int so we can detect underflow
@@ -260,7 +261,7 @@ - (void)verifySignatureData: (NSData*)signatureData v: (unsigned char)v {
     
     NSMutableArray *raw = [self _packBasic];
     if (_chainId) {
-        [raw addObject:dataWithByte(_chainId)];
+        [raw addObject:dataWithByte(_chainId,chainName(_chainId))];
         [raw addObject:NullData];
         [raw addObject:NullData];
     }
@@ -335,14 +336,14 @@ - (NSData*)serialize {
     NSMutableArray *raw = [self _packBasic];
 
     if (_signature) {
-        uint8_t v = 27 + self.signature.v;
+        int v = 27 + self.signature.v;
         if (_chainId) { v += _chainId * 2 + 8; }
-        [raw addObject:dataWithByte(v)];
+        [raw addObject:dataWithByte(v,chainName(_chainId))];
         [raw addObject:stripDataZeros(self.signature.r)];
         [raw addObject:stripDataZeros(self.signature.s)];
 
     } else {
-        [raw addObject:dataWithByte(_chainId ? _chainId: 28)];
+        [raw addObject:dataWithByte(_chainId ? _chainId: 28,_chainId?(chainName(_chainId)!=nil):true)];
         [raw addObject:NullData];
         [raw addObject:NullData];
     }
@@ -354,7 +355,7 @@ - (NSData*)unsignedSerialize {
     NSMutableArray *raw = [self _packBasic];
 
     if (_chainId) {
-        [raw addObject:dataWithByte(_chainId)];
+        [raw addObject:dataWithByte(_chainId,chainName(_chainId))];
         [raw addObject:NullData];
         [raw addObject:NullData];
     }