um fee to send the transaction
                firstRound: txtParams['last-round'], // the first round the transaction is valid for
                lastRound: txtParams['last-round'] + 1000, // the last round the transaction is valid for
                genesisID: txtParams['genesis-id'], // required 
                genesisHash: txtParams['genesis-id'], // required
                flatFee: true // Levy a flat fee instead of a variable fee
            }))
            .then((signedTx) => {
                co