Exchange implementation in the official programming language of Aeternity - Sophia.
It's still Work-in-Progress:
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Few optimization are needed on how orders and order history are stored.
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Events should be raised on all public stateful functions i.e. Deposit, Withdraw, PlaceOrder, TakeOrder, CancelOrder.
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Main functionalities are already tested - depositing, withdrawing, placing an order, taking an order, cancelling an order. Edge case and failure tests should be implemented in a separate files and the main functionallity test should not be changed unless the smart contract source is modified.