# Gavin Andresen
# 2011-06-23 01:09:31
# https://bitcointalk.org/index.php?topic=19080.msg267432#msg267432

Here's a use case I'd like to work: @p{par}

I tell Bitcoin running on my computer or cell phone to run transactions through a bitcoin security service@p{--} maybe I give it a @s{(link)} URL for the service. @p{par}

I tell the security service "auto-approve small-value transactions, but give me a call for any transactions above $X (or $XY per day)." @p{par}

The security service sends me something in the mail that I keep safe, but that I can use to recover use of my bitcoins in case the security service goes out of business or disappears or I decide to stop paying for the service. @p{par}

I get bitcoin addresses either from my bitcoin client (not trustworthy!) and/or from the security service that require both my computer and the security service to sign to spend.  And I have people send bitcoins (or I self-send my own bitcoins) to those addresses. @p{par}

Spending coins is done as usual@p{--} I type in an amount and an address.  Behind the scenes, magic happens, and if the transaction is greater than $X I get a phone call @p{--} "Press 1 to confirm payment of $X bitcoins to bitcoin address blah, press 2 to cancel." @p{par}

If I suddenly get random phone calls, I know my computer has been infected. @p{brk}