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Can a smart contract be created which can be exchanged once at point of sale, and only transferred subsequently through a single approved exchange? Can that be written into the contract itself?
Restricting transferability of Smart Contracts
Answers
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Bitcoin script only allows the conditions under which an output can be spent to be controlled, it does not provide a method for dictating what can happen to the output once these conditions have been satisfied. The concept you are describing is called a coin covenant, the linked thread goes into some detail explaining why this is generally a bad idea.
that's actually very useful thank-you. – Mass Mgmt – 2015-08-03T12:47:34.167
Hopefully Bitcoin's answer below helps, but you may get a more specific answer if you ask a more specific question. What Smart Contract Platform are you using? What have you already tried? – morsecoder – 2015-08-04T17:16:19.830