fix nft creator logic on protocol version 7

Author: merl111

Phantasma.Blockchain/Nexus.cs

@@ -1265,7 +1265,17 @@ internal void WriteNFT(RuntimeVM Runtime, string symbol, BigInteger tokenID, str
             else
             {
                 Runtime.Expect(!mustExist, $"nft {symbol} {tokenID} does not exist");
-                var genID = GenerateNFT(Runtime, symbol, chainName, owner, rom, ram, seriesID);
+                Address _creator;
+                if (this.GetProtocolVersion(Runtime.RootStorage) >= 7)
+                {
+                    _creator = creator;
+                }
+                else
+                {
+                    _creator = owner;
+                }
+                
+                var genID = GenerateNFT(Runtime, symbol, chainName, _creator, rom, ram, seriesID);
                 Runtime.Expect(genID == tokenID, "failed to regenerate NFT");
             }
         }

Phantasma.Blockchain/Runtime.cs

@@ -1352,9 +1352,19 @@ public BigInteger MintToken(string symbol, Address from, Address target, byte[]
             Runtime.Expect(rom.Length <= TokenContent.MaxROMSize, "ROM size exceeds maximum allowed, received: " + rom.Length + ", maximum: " + TokenContent.MaxROMSize);
             Runtime.Expect(ram.Length <= TokenContent.MaxRAMSize, "RAM size exceeds maximum allowed, received: " + ram.Length + ", maximum: " + TokenContent.MaxRAMSize);
 
+            Address creator;
+            if (ProtocolVersion >= 7)
+            {
+                creator = from;
+            }
+            else
+            {
+                creator = target;
+            }
+
             BigInteger tokenID;
             using (var m = new ProfileMarker("Nexus.CreateNFT"))
-                tokenID = Nexus.GenerateNFT(this, symbol, Runtime.Chain.Name, target, rom, ram, seriesID);
+                tokenID = Nexus.GenerateNFT(this, symbol, Runtime.Chain.Name, creator, rom, ram, seriesID);
             Runtime.Expect(tokenID > 0, "invalid tokenID");
 
             using (var m = new ProfileMarker("Nexus.MintToken"))

Phantasma.Domain/DomainSettings.cs

@@ -56,7 +56,7 @@ public StakeReward(Address staker, Timestamp date)
 
     public static class DomainSettings
     {
-        public const int LatestKnownProtocol = 6;
+        public const int LatestKnownProtocol = 7;
 
         public const int MaxTxPerBlock = 1024;