Guarantee first two bytes of spending key are SK

src/chainparams.cpp

@@ -107,7 +107,8 @@ public:
         base58Prefixes[EXT_SECRET_KEY] = boost::assign::list_of(0x04)(0x88)(0xAD)(0xE4).convert_to_container<std::vector<unsigned char> >();
         // guarantees the first two characters, when base58 encoded, are "zc"
         base58Prefixes[ZCPAYMENT_ADDRRESS] = {22,154};
-        base58Prefixes[ZCSPENDING_KEY] = {22,180};
+        // guarantees the first two characters, when base58 encoded, are "SK"
+        base58Prefixes[ZCSPENDING_KEY] = {171,54};
 
         vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_main, pnSeed6_main + ARRAYLEN(pnSeed6_main));
 
@@ -186,7 +187,7 @@ public:
         base58Prefixes[EXT_PUBLIC_KEY] = boost::assign::list_of(0x04)(0x35)(0x87)(0xCF).convert_to_container<std::vector<unsigned char> >();
         base58Prefixes[EXT_SECRET_KEY] = boost::assign::list_of(0x04)(0x35)(0x83)(0x94).convert_to_container<std::vector<unsigned char> >();
         base58Prefixes[ZCPAYMENT_ADDRRESS] = {22,155};
-        base58Prefixes[ZCSPENDING_KEY] = {22,181};
+        base58Prefixes[ZCSPENDING_KEY] = {171,55};
 
         vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_test, pnSeed6_test + ARRAYLEN(pnSeed6_test));