The problems with that are larger than time being unreliable. It is no
longer reorg-safe as transactions can expire in the course of a reorg and
any transaction built on the now expired transaction is invalidated.

On Fri, May 8, 2015 at 1:51 PM, Raystonn <raystonn@hotmail.com> wrote:

> Replace by fee is what I was referencing.  End-users interpret the old
> transaction as expired.  Hence the nomenclature.  An alternative is a new
> feature that operates in the reverse of time lock, expiring a transaction
> after a specific time.  But time is a bit unreliable in the blockchain
>