If the user approves the transaction request with its PKSA, the latest will send a sign_ack message to the HAS. The HAS will then forward the following message to the APP:
broadcast: true if the transaction was broadcasted to the blockchain by the PKSA, otherwise false
data: contains either the transaction id (txid) if the transaction has been broadcasted or the signed transactions (signed_tx) if it has not been broadcasted.