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New blocks are created in a lottery process (mining) that could take seconds to hours for someone to win. We are using unconfirmed transactions but are willing to take some risk while developing strategies to mitigate that risk. Orphan blocks don't concern us so long as the transactions we are honoring make it into the greatest-height chain.

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Thanks for the answer!

Why don't you focus just on the realtime aspect and create a service that allows realtime bitcoin transactions on any website (and inside every app) trough an API, and ask for a smaller percentage (like ~2%, like a credit card company)?

There are already a number of merchant processing systems for Bitcoin including MtGox's payment api and Bit-Pay. Neither one supports instant transactions coming via the Bitcoin network (MtGox is instant if buyer and seller both have funds there), but the cultural aspect of helping Bitcoin users sell their wares easily was also an attractive one for this project.

Still, it's a great suggestion and will be considered for future development.

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