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I'd be interested to see some examples of Bitcoin contracts used right now.
- Websites that provide escrow services.
- Smart properties.
- Trading of contracts.
- Oracles.
Or are they not really in use right now?
Where are contracts used in the real world
Answers
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Gregory Maxwell, Pieter Wuille, and theymos are using a 2-of-3 address to store a bounty for contributions to CoinJoin.
https://bitcointalk.org/index.php?topic=279249.msg2983911#msg2983911
Update: A 2-of-3 escrow and arbitration site recently launched: https://www.bitrated.com/
https://bitgo.com/ is another one. I have an account with them but haven't transferred anything yet. – David Silva Smith – 2013-12-04T17:32:33.147
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I don't know of any that implement the advanced features in the protocol. But I do know of two sites that make it easier to do escrow transactions with 2 of 2 secrets:
www.bitescrow.org/
There was also a bounty on the forums for an easy to use n of m escrow application that emailed all parties involved their secrets:
There's a system of distributed oracles that launched last month - http://oracles.li/ , with a whitepaper available here: https://github.com/orisi/wiki/wiki/Orisi-White-Paper . Right now the test oracles allow for timelocking bitcoins, and there are other transaction / contract types coming soon, hopefully.
– kolinko – 2014-06-23T17:44:42.847