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dexX7/Almost trustless direct sale

Created March 9, 2014 23:08
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Almost trustless direct sale
Say, you want to buy some Mastercoins, but you are not sure, if the seller wants to scam you.
Step 1: The Seller prepares a signed "send" transaction and tells the buyer the transaction hash.
Step 2: The Buyer prepares a signed transaction for the payment and uses the "send" transaction's hash as input.
The buyer then sends the seller the raw transaction and the seller broadcasts both.
If the seller invalidates the "send" transaction, his payment is also invalidated.
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