Add new DB column for statechain which counts number of signatures generated for a specific coin. A new transfer/count returns this number for specified statechain_id. The client verifies that this number matches the number of backup txs in transfer_message_3
Add new DB column for statechain which counts number of signatures generated for a specific coin. A new
transfer/countreturns this number for specified statechain_id. The client verifies that this number matches the number of backup txs intransfer_message_3