diff --git a/src/main/java/bitwheeze/golos/goloslib/model/op/CommentOptions.java b/src/main/java/bitwheeze/golos/goloslib/model/op/CommentOptions.java
index c9a60bb..4baab76 100644
--- a/src/main/java/bitwheeze/golos/goloslib/model/op/CommentOptions.java
+++ b/src/main/java/bitwheeze/golos/goloslib/model/op/CommentOptions.java
@@ -19,6 +19,5 @@ public class CommentOptions extends Operation {
     private short percentSteemDollars;
     private boolean allowVotes;
     private boolean allowCurationRewards;
-    @JsonDeserialize(using = ToStringDeserializer.class)
-    private String extensions;
+    private String[] extensions;
 }
diff --git a/src/main/java/bitwheeze/golos/goloslib/model/op/DelegateVestingSharesWithInterest.java b/src/main/java/bitwheeze/golos/goloslib/model/op/DelegateVestingSharesWithInterest.java
index 13e6b98..a61e543 100644
--- a/src/main/java/bitwheeze/golos/goloslib/model/op/DelegateVestingSharesWithInterest.java
+++ b/src/main/java/bitwheeze/golos/goloslib/model/op/DelegateVestingSharesWithInterest.java
@@ -18,6 +18,5 @@ public class DelegateVestingSharesWithInterest extends Operation {
     String delegatee;
     Asset vestingShares;
     int interestRate;
-    @JsonDeserialize(using = ToStringDeserializer.class)
-    private String extensions;
+    private String[] extensions;
 }
diff --git a/src/main/java/bitwheeze/golos/goloslib/model/op/Donate.java b/src/main/java/bitwheeze/golos/goloslib/model/op/Donate.java
index 04a2625..1e1f565 100644
--- a/src/main/java/bitwheeze/golos/goloslib/model/op/Donate.java
+++ b/src/main/java/bitwheeze/golos/goloslib/model/op/Donate.java
@@ -4,6 +4,7 @@
 import com.fasterxml.jackson.databind.JsonDeserializer;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import lombok.AllArgsConstructor;
+import lombok.Builder;
 import lombok.Data;
 import lombok.ToString;
 
@@ -12,6 +13,7 @@
 @JsonDeserialize(using = JsonDeserializer.None.class)
 @OpName("donate")
 @AllArgsConstructor
+@Builder
 public class Donate extends Operation {
     private String from;
     private String to;
diff --git a/src/main/java/bitwheeze/golos/goloslib/model/op/Invite.java b/src/main/java/bitwheeze/golos/goloslib/model/op/Invite.java
index 04646f1..357ea22 100644
--- a/src/main/java/bitwheeze/golos/goloslib/model/op/Invite.java
+++ b/src/main/java/bitwheeze/golos/goloslib/model/op/Invite.java
@@ -17,6 +17,5 @@ public class Invite extends Operation {
     String creator;
     Asset balance;
     String inviteKey;
-    @JsonDeserialize(using = ToStringDeserializer.class)
-    private String extensions;
+    private String[] extensions;
 }
diff --git a/src/main/java/bitwheeze/golos/goloslib/model/op/LimitOrderCreate.java b/src/main/java/bitwheeze/golos/goloslib/model/op/LimitOrderCreate.java
index a782272..4a6e3d5 100644
--- a/src/main/java/bitwheeze/golos/goloslib/model/op/LimitOrderCreate.java
+++ b/src/main/java/bitwheeze/golos/goloslib/model/op/LimitOrderCreate.java
@@ -6,6 +6,8 @@
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 
 import bitwheeze.golos.goloslib.model.Asset;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
 import lombok.Data;
 import lombok.ToString;
 
@@ -13,6 +15,8 @@
 @ToString
 @JsonDeserialize(using = JsonDeserializer.None.class)
 @OpName("limit_order_create")
+@AllArgsConstructor
+@Builder
 public class LimitOrderCreate extends Operation {
     private String owner;
     private long orderid;
diff --git a/src/main/java/bitwheeze/golos/goloslib/model/op/TransferFromTip.java b/src/main/java/bitwheeze/golos/goloslib/model/op/TransferFromTip.java
index 71b723e..f60af95 100644
--- a/src/main/java/bitwheeze/golos/goloslib/model/op/TransferFromTip.java
+++ b/src/main/java/bitwheeze/golos/goloslib/model/op/TransferFromTip.java
@@ -4,17 +4,20 @@
 
 import bitwheeze.golos.goloslib.model.Asset;
 import bitwheeze.golos.goloslib.model.ToStringDeserializer;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
 import lombok.Data;
 import lombok.ToString;
 
 @Data
 @ToString
 @OpName("transfer_from_tip")
+@AllArgsConstructor
+@Builder
 public class TransferFromTip extends Operation {
     private String from;
     private String to;
     private Asset amount;
     private String memo;
-    @JsonDeserialize(using = ToStringDeserializer.class)
-    private String extensions;
+    private String[] extensions;
 }
diff --git a/src/main/java/bitwheeze/golos/goloslib/model/op/WithdrawVesting.java b/src/main/java/bitwheeze/golos/goloslib/model/op/WithdrawVesting.java
index 0a75c67..4cecea2 100644
--- a/src/main/java/bitwheeze/golos/goloslib/model/op/WithdrawVesting.java
+++ b/src/main/java/bitwheeze/golos/goloslib/model/op/WithdrawVesting.java
@@ -1,16 +1,14 @@
 package bitwheeze.golos.goloslib.model.op;
 
 import bitwheeze.golos.goloslib.model.Asset;
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.NoArgsConstructor;
-import lombok.ToString;
+import lombok.*;
 
 @Data
 @ToString
 @OpName("withdraw_vesting")
 @AllArgsConstructor
 @NoArgsConstructor
+@Builder
 public class WithdrawVesting extends Operation {
     String account;
     Asset vestingShares;