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In last years I have read a lot about "Smart contracts".

But I cannot understand why we need bitcoin for this? The old-fashioned US Dollar are not used in Smart Contracts?

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I guess it depends on what precisely counts as "self-executing" but escrow transactions are very similar and quite common, particularly in real estate and certain kinds of online transactions.

An escrow is a deposit of funds, a deed or other instrument by one party for the delivery to another party upon completion of a specific condition or event. It is an independent neutral account by which the interests of all parties to the transaction are protected.

What is Escrow? - Title One

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