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I see that it is possible to add custom data, but it seems like there is no validation of its correctness on the blockchain side. So the question - is it possible to implement custom transaction types with custom state and validation logic (not necessarily linked to cryptocurrency) without forking Stellar core code?

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No it's impossible without changing the protocol. Basic validation and smart contracts logic can be implemented on top of transaction preconditions, read more here. Use cases are somewhat limited, but CAP-21 proposal (hopefully we'll see it implemented by the end of the year) introduces more advanced preconditions for Stellar smart contracts.

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