Use transaction.blocktime in limited cases

[wtogami]

In some limited cases during Baron startup only, use of transaction.blocktime for the payment time may be closer to accurate than transaction.time.

This requires a bit more thought of exactly when.

[akinsey]

@wtogami Any updates on this? Do you know when would be best to use transaction.blocktime instead of transaction.time?

[wtogami]

Requires reading the bitcoin source code. As you recall this is a very rare event that we can't totally fix due to the lack of prices during downtime. We have higher priorities elsewhere.