KAI. The first letter must be an alphabet character. The length of symbol should be between 3 and 13.
-followed by random 3 letters will be appended to the provided symbol to avoid uniqueness constraint. For example,
KAI-0EA. Those 3 letters are the first three letters of the Tx hash of the
issuetransaction. So, the total length of the generated symbol will be between 7 and 17. The generated symbol will be returned as a Tx response.