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Zcash has undergone several protocol upgrades and we only focus on the latest version. This article mainly introduces the core concepts of Zcash. In Zcash, the inputs and outputs of all transactions are notes. Zcash also supports non-anonymous transactions, identical to Bitcoin’s transaction model. The data structure of note is as follows: Note is the basic unit of the Zcash protocol, similar to the UTXO of BTC. In order to further understand Zcash you must know the data structure first.