Add TxCompressedData & V2 with some extra parsers for common

common/token.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"encoding/binary"
 	"time"
 
 	eth "github.com/ethereum/go-ethereum/common"
@@ -26,3 +27,10 @@ type TokenInfo struct {
 
 // TokenID is the unique identifier of the token, as set in the smart contract
 type TokenID uint32 // current implementation supports up to 2^32 tokens
+
+// Bytes returns a byte array of length 4 representing the TokenID
+func (t TokenID) Bytes() []byte {
+	var tokenIDBytes [4]byte
+	binary.LittleEndian.PutUint32(tokenIDBytes[:], uint32(t))
+	return tokenIDBytes[:]
+}