Quote from: My support request
Is a pending transaction susceptible to cancellation until it is completed?
Do the chances of a transaction completing go up as the few days during which it is pending go by? Is most of the risk analysis done early during the pending period, or is it done at an essentially random time before the due date?
Do the chances of a transaction completing go up as the few days during which it is pending go by? Is most of the risk analysis done early during the pending period, or is it done at an essentially random time before the due date?
Quote from: David T at Coinbase Support
Unfortunately we're unable to share our security processes at this time. All transactions are processed to ensure the safety and security of all users.
What this tells me is that the answers are:
- YES, pending means susceptible to cancellation.
- NO, the chances are the same until it is completed.
- It is done at an essentially random time before the due date.
I have alerted Coinbase support of this thread in case my representation isn't accurate so that they can clarify here.
and more secure
Hahaha I was asking about the coinbase to exchange. I am using green adresss as a wallet or blockchain info and also trying to learn about securing my keys. 
