diff --git a/lib/primitives/tx.js b/lib/primitives/tx.js
index ccbeae4a..20771a5a 100644
--- a/lib/primitives/tx.js
+++ b/lib/primitives/tx.js
@@ -2276,6 +2276,8 @@ TX.prototype.fromJSON = function fromJSON(json) {
   for (const output of json.outputs)
     this.outputs.push(Output.fromJSON(output));
 
+  this.strFloData = json.floData
+
   this.locktime = json.locktime;
 
   return this;
@@ -2423,7 +2425,6 @@ TX.prototype.fromWitnessReader = function fromWitnessReader(br) {
 
   this.locktime = br.readU32();
 
-  if (this.version >= 2){
     var floDataLength = br.readVarint();
     var floDataBuffer = br.readBytes(floDataLength);
     this.strFloData = Buffer.from(floDataBuffer).toString();
@@ -2536,6 +2537,10 @@ TX.prototype.writeWitness = function writeWitness(bw) {
 
   bw.writeU32(this.locktime);
 
+  if (this.version >= 2){
+    bw.writeVarBytes(Buffer.from(this.strFloData));
+  }
+
   if (witness === this.inputs.length)
     throw new Error('Cannot serialize empty-witness tx.');
 
@@ -2604,6 +2609,17 @@ TX.prototype.getWitnessSizes = function getWitnessSizes() {
   for (const output of this.outputs)
     base += output.getSize();
 
+  if (this.version >= 2){
+    let bufferLength = Buffer.from(this.strFloData).length;
+
+    if (this.strFloData.length > 0){
+      base += encoding.sizeVarint(bufferLength);
+      base += bufferLength
+    } else {
+      base += encoding.sizeVarint(0);
+    }
+  }
+
   base += 4;
 
   return new RawTX(base + witness, witness);
diff --git a/package.json b/package.json
index f16c1adb..4bfd9989 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fcoin",
-  "version": "1.0.0-beta.29",
+  "version": "1.0.0-beta.30",
   "description": "Flo bike-shed",
   "license": "MIT",
   "repository": "git://github.com/oipwg/fcoin.git",