Clarification on one part below:

On Wed, Apr 11, 2018 at 2:21 PM, Karl-Johan Alm
<> wrote:
> On Wed, Apr 11, 2018 at 5:29 AM, Maksim Solovjov via bitcoin-dev
> <> wrote:
>> 1. What does it mean for a transaction ( with 0 confirmations ) to be
>> trusted or not?
> It is trusted if (1) it is final (i.e. it can't be replaced), (2) it
> is not in a block that was reorged out (negative confirmation count),
> (3) the 'spend zero conf change' option is set, (4) it is in the
> mempool, and (5) all inputs are from us.

"can't be replaced" here means it cannot be replaced through
conventional means. It is always possible to replace a transaction
that has not yet been confirmed, e.g. by asking a miner to mine a
conflicting transaction directly.
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