Added ValidatorRev to BidAddrKey class

Casper.Network.SDK.Test/GlobalStateKeyTest.cs

@@ -634,6 +634,16 @@ public void BidAddrKeyTest()
                 Assert.IsNull(bidAddrKey.DelegatorAccount);
                 Assert.AreEqual(127, bidAddrKey.EraId);
             }
+            {
+                var validatorRevBidAddrKeyStr = "bid-addr-092f3fb80d362ad0a922f446915a259c9aaec9ba99292b3e50ff2359c458007309";
+                var key = GlobalStateKey.FromString(validatorRevBidAddrKeyStr);
+                Assert.IsNotNull(key);
+                Assert.AreEqual(KeyIdentifier.BidAddr, key.KeyIdentifier);
+
+                var bidAddrKey = key as BidAddrKey;
+                Assert.AreEqual(BidAddrTag.ValidatorRev, bidAddrKey.Tag);
+                Assert.AreEqual("account-hash-2f3fb80d362ad0a922f446915a259c9aaec9ba99292b3e50ff2359c458007309", bidAddrKey.Validator.ToString().ToLower());
+            }
         }
     }
 }

Casper.Network.SDK/Types/GlobalStateKey/BidAddrKey.cs

@@ -42,6 +42,10 @@ public enum BidAddrTag
         /// BidAddr for unbonding purses.
         /// </summary>
         UnbondPurse = 8,
+        /// <summary>
+        /// BidAddr for reverse validator look up.
+        /// </summary>
+        ValidatorRev = 9,
     }
 
     public class BidAddrKey : GlobalStateKey
@@ -146,6 +150,12 @@ public BidAddrKey(string key) : base(key, KEYPREFIX)
                     Validator = new AccountHashKey(bytes.Slice(1, 33));
                     DelegatorPurseAddress = Hex.ToHexString(bytes.Slice(33));
                     break;
+                case (byte)BidAddrTag.ValidatorRev:
+                    Tag = BidAddrTag.ValidatorRev;
+                    if (bytes.Length != 33)
+                        throw new Exception("Wrong key length for ValidatorRev BidAddr. Expected 33 bytes.");
+                    Validator = new AccountHashKey(bytes.Slice(1, 33));
+                    break;
                 default:
                     throw new Exception($"Wrong BidAddr tag '{bytes[0]}'.");
             }