we have a transaction type named proposol,
a proposol can contain multi transactions,
and all transactions in a proposol will confirm/expired togother,
so all transactions will execute in an atom op
this is a very usefull feature you should know
for example, if you want to do a business, sell BTS account
you can build a proposol include 2 transactions:
1. change the key to buyer's
2. transfer 100 CNY from buyer to you
then you signed it and broadcast it
after the buyer signed it, your deal complete.
no agency need
and many other business can use this feature.
I will use it in my next public service