In previous chapters, I covered different blockchains, and you learned how to create smart contracts that can interact with a blockchain. You created smart contracts in Ethereum, NEO, EOS, and Hyperledger. In Chapter 1, I broke down the process into five layers: consensus layer, miner or booking layer, propagation layer, semantic layer, and application layer. Smart contracts are part of the application layer in the development cycle; however, the application layer is incomplete without having a front-end interface that enables an end user to interact with the blockchain.
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